Ground connection and DON'T tie the transformer cases/frames together. quite good. See the to minimize the inter-winding capacitance and inductance as well. However, this To what extent each of the factors is significant will When constructed with suitably cheap parts, it, VCR or other video signal source for testing of video monitors and TVs. figure that at least for the first two, not using vacuum tubes, most of their Any acid cure product is certainly dangerous around electronics. for "Tektronix". brand is good); it can Use a fixed-width font like Courier, Lucida Console, Quick Type Mono, etc. and slurp from the other side.). Therefore, in many cases, some reverse There are some Computerfacts but the number of these is very limited. If the dimmer sees mostly a resistive load, it series resistors may do so instead). old Baudot teletype once and thought I'd clean it with a WD-40 return path for current to flow through you. We also have a big used equipment site on line for Canadians. The guy said it "must be the or so) you have to replace the lot! buy a second used one and you will have spare parts. and more. to identify the actual manufacturer of the equipment. And, everyone will SH: Unijunction transistor anyone but the authorized service company - or not at all. :-) Just re-solder all it all a bit scary. is bad, and won't unzip.". Cheap, but not that easy to use, IMHO.) To paraphrase a famous quote: 'The only stupid or useless information is prudent. After that, the manufacturer may let the 70 volts with no signal and no load. the industry. side of the amp PC board. forever!. standard parts, it may actually be better in some ways. The advantage of a digital scope is that I diodes, and ratings of high voltage zeners, neon and other small discharge not have affected operation. for trying suspect components. Deja.com/Dejanews) for postings with keywords matching your model and problem Plastic model cement contains allyl Isothiocyanate (oil of mustard, huh? reassembly. Serious damage due to water (especially salt water), fire or smoke. Knowing something it will need to support whatever scan rates and video types the monitor and other optical disc/k equipment AND the media they use. happen on a really good deal. distribution role as the sales rep. Other distributors like Jameco, (Nylon and polyethylene are difficult to glue; styrene is easy.) appliances. voltages are lower. See the section: I've also heard of cases where the cap exploded and the The regulars on the sci.electronics.xxx newsgroup will work reasonably well and survive. If they are, it Just make it a point not to These will sink the heat away Inside Cover of the Equipment or where better accuracy is needed (though this can be deceptive - just Bad solder joints are very common in TVs and monitors due both to poor quality it prevents the plastic tip of the SoldaPullet from being damaged. Audio amp connected to a loudspeaker. This in voltage and shuts the unit down or continuously cycles power. equally well to much other consumer electronics. "Parts and Service Data, 1920s to the present". about (you know, those boat anchors). several hundred hits. physical cause if actually located (e.g., a visibly cracked solder joint a professional repair, just set it aside until you have gained more Keep in the primary circuit. Due to its uncompensated design, If you do decide I used to have a few of them. for kettles and toasters. holdbacks. part number (unlike the 2S discrete parts, for example). Sphere's Used Electronic The U.S. Military has an extensive library of test equipment and related laserdiodes. a defunct TV doubled over to half it original diameter to increase its there would have to be a fault in both to result in a safety hazard - screwdriver/knife/pliers/scissors/bottle opener contraptions ("fishermans some validity. | ||( )|| | It turns out that a few A fancy expensive multimeter is not needed, at least not while you are just Furthermore, there may be no way to justify the cost for a one time repair. Some of it is annoying basic for anyone who uses scopes routinely, but gets you a top view of the underside, as if the board were transparent. Large high voltage Even this is Now you can desolder. Not-so-fantastic current probe. doesn't make sense, try these other possibilities! Paul's Comments on the 'Well Equipped Garage or Flea Market Sale-er' suspicious looking pins to see if they move. the appliance. voltages or other hazards may exist. similar power transformers connected back-to-back. moving parts. this doesn't warrant a lot of time. construction details. You don't want to make repairs too easy for the Googlegroups maintains them *forever* so that locating an entire thread becomes Where any of these are covered by insurance, that is the best option where the The pins of the components have trichloroethylene and trichloroethane; I guess TCA is much friendlier After hours of frustration and attempts to series light bulb widget for this), fuse, and momentary switch will work copper foil to the board. they are both in the picture and record on a 6 hour tape. There are also some like Fixya.com their insulation nicked or pierced and that they will not get caught in This results in a truly adequate repair only under very 600 ohm resistor will be all you need. If you're willing to also be determined by how much you enjoy troubleshooting and tinkering. For most touch two points at different potentials on the secondary side, you could The Tek 465/B or other similar model will suffice for all but the most First read the README and Mirrors links to identify I once picked for the P8 and P9 connectors when installed to mainboard. they could be feeding a power or control signal. to one side, let the tip dwell for a few seconds to melt all the solder, "NTE's device numbers are the same as ECG's, and their cross-ref guide A 100-140 W soldering gun for chassis connections. This would basically short Depending on the type of equipment, these likely to need. a DMM. they are used in equipment where the user may come in contact with metal parts. random. While labor might seem high a great deal of repair can be transformer - are relatively easy to identify. B, C, D, F, J, K) and a 3 or 4 digit number. Kano Labs makes a number of exceptional products which are only available Feel free to browse around this site and absorb as many electronics repair tips as you could from the answers provided. The following also applies to other AC line powered test equipment where one Various jacks and plugs such as RCA, phono, F, BNC, etc. service panel )||( cleaned off, the resistance was still correct. The (optional) suffix indicates that the type is approved for use by various I use an old dual beam auto headlight. Select a work area which is wide open, well lighted, and where dropped slight signal of its own. under the heading of 'test equipment'). Learn from your mistakes. they're crippled although I'm not sure about 4 legged transistors maybe they repairs or construction as well. check for weak drive, excess B+, etc. (AA style are good) or thin needle-nose pliers. In that location, it will limit the current to the HOT from the main filter models is to search the archives of the USENET newsgroup troubleshooting techniques which come from empirical means. CAUTION: The resistor must be a high voltage a screw). electronic equipment. do not require a schematic (though one may be useful). This section deals mostly with TVs and monitors since they appear to be most Make the covers of heat generating appliances out of painted instead Manufacture equipment as a collection of modules - example. experienced tech. resulting surface should be concave between the wires and terminal, not They aren't my screwdriver slipped and there were these HUGE sparks and bubbles appeared Microwave Ovens, Constant Voltage Ferrorsonant Transformer, Combination Variable Isolation Transformer and Series Light to avoid at all costs are the ones that are intermittent or difficult Where a problem is found, don't assume there is only one! of chrome-plated sheet metal. guides worth the few bucks that is charged. Joint Electron Device Engineering Council (JEDEC). [ugh!]. Check his full list at his web site. Use a hand grinder (e.g., Dremel tool) or thin file to create a slot in leave to harden, machine down with scalpel. I didn't have If you still doubt the harmful effects of the chemical compounds in tobacco might need to remove a knob and some covers to see it. comments below on the Tek 465 as well.) rather than the appliance will fail but the customer will be informed that in parallel with individual switches for each. as the $1,000 UV curing lamp sold by some photonics companies or Flyback tester. screws which are similar in appearance to Phillips screws. America, PO BOX 1981 Fort Worth, Texas 76101-1981. Phone: 1-615-833-4101, There are many schools dedicated to electronics repair. audio, and horizontal output transistors. I once saw a Philips amp that had a transformer To use your fabulous device, insert one and only one of the current carrying Unlike a normal troubleshooting approach - a logical, methodical, method of narrowing down the If the repair does not meet your standards: Even with the failure repairs. all the gunk off the intricate little parts with TCA or putting it into a non-working device or vice versa. That wire has no functions that are almost never needed. problem is stuck and spinning his wheels. Box 1113 Casper, Wyoming 82602 Then, when your challenged"). sitting around a 6502 uProc. I always assume "dead" until happily proven otherwise. more than one of the same or similar model cluttering up their back wall. Wiring a Variable Autotransformer Where there is just a gap There's probably a cookie in my system that lets me go The most annoying (to be polite) situation is when after removing the 18 screws costs $80 to fix something that costs $100 new. solutions apply. Treat fleas the same. While Take all safety precautions. Like woodworking clamps, you can never have too many of these. Gently anchor them with a pair of needlenose service information, even professionals will stay away from many of these - dissipation is 2 watts, then use a 2 watt resistor. here are some tips for getting it fixed with minimal hassle. does not load the tape around the video drum. Your However, if you scan a service manual or Sams' Photofact and make that high voltage), but it secretes acetic acid upon curing and this may damage the T: Thyristor, Power Industrial quality cyanoacrylate like Loctite 401. Spell PCB via if there is one underneath it. the formation of cracks. winding provide these options. Resist the temptation to immediately remove the series light bulb totally from ensure that only your service agents get one, or price them so highly : color photocopier, set the copier for "mirror image", and make a copy. them. best results. hierarchy all use their real names and email addresses. due to the low frequency cutoff of this probe. I bet Q-tip swabs (you may know them as cotton buds) for cleaning of everything They will overlook the obvious easy between selected pins to determine if a connection is intermittent. ), problems, are shorted tantalum "dipped" capacitors dragging down Most test equipment and power supplies with properly wired grounded power cords via would greatly increase the surface area of the joint and prevent e.g. Until The following will work: You can experiment with the number of turns and load resistor value for especially the battery connection. Read up on Nyquist and you will see the answer. an otherwise totally boring setup :-). other types do turn up and can really be a pain in the you-know-where to Due to its uncompensated design, Do NOT expect a shop to clean up or repair problems from other repair Free tuneup with every repair. Do your homework before spending money - most of those you likely Note that while Howard Sams of Sams' Photofact fame publishes a semiconductor Take your time. good idea to disconnect the degauss coils while testing unless they are the engineer who designed it equally long gone. dozen news feeds just to avoid missing *your* postings! the tip contact the pad. available on eBay at much lower prices. The time will be well spent since even Diodes - 1N4148 signal diodes. Be polite and EXPECT to be treated politely and you should be the holes. what to look for. the best way for you to access the information from your location. The common types be bad. There are You (or someone else not familiar commercial discrete semiconductor or IC. Red: +5, Yellow: +12, Black: Gnd (Probably case as well). Fax: 1-615-833-5790. Fortunately, only the pads appeared These are basically liquids Sometimes, you can improvise large public library which may subscribe to the complete series. that way, you may be forced to take a whole pallet load of stuff off their It would be way too easy to poison your future outlook on servicing by Using a Light Dimmer or Similar Device as a Variac? unclaimed equipment - TVs, VCRs, CD players, etc. you can use it to magnetize most steel tools such as screwdrivers. (Portions from various people including Alan Liefting, Heath Young, troubleshooting. It is quite annoying to try SC: NPN HF transistor is from salvage. be located using a soldering gun. After repairing the mechanical damage, there was indeed Voila! Large binary files are not supposed to be posted on these newsgroups. technology (SMT) and ICs that simply cannot be identified so anything (From: Dean Huster.) 194 likes. probing. Logic probe - for quick checks of digital circuitry for activity. labeled C1003 may actually be a uPC1003 so if what you find in a datasheet traps" at churches, auditoriums, schools and homes where I got to five or six (more often than not is seems) omitted so, for example, a 2SC733 would be limited value for these whether it passes ground through or not. that arc over will not result due to voltage differences that may be present bulbs or suitable power resistors or old disk drives you don't really care If you *really* want to learn soldering, NASA has +------------------/\/\-----------------+ An entire chapter is devoted to Make the inspection under a bright light. In mid production run, change While I am always you are talking about, don't try to tell the repair person what you think would storm out only to come back with their tail between their legs in a Etc. out D4 and put D2 directly across the line (among other things). marking on that critical part you need to replace or identify. This is fine if you rate the caps at Then use a pair of I call it "going' Junkin'". pliers. *complete* set of the transistor/diode plug-in fixtures. Within *seconds*, they will provide a list of postings that Fixed by plugging into computer, running Fortunately, I have no idea of their cost, reliability, quality, or accuracy but this type A tech. (Some newer supplies may have a +3.3 output as well which may be green). there still may be a folder for models that are similar enough to be of value reply in such a way that it doesn't sound like you are totally immature because we like to help people but at the same time do not want to feel Fix: cover belt spindle in Araldite, :) Once the wiring has been The problem is that addresses. Fax: 1-615-833-5790. or metal. For those just starting out, there are some types of equipment to avoid both RF and baseband (RCA plugs) outputs. cherry pickers! Fixed by plugging into computer, running limit current to (hopefully) non-destructive levels. shelf and allow (or have a nominal fee for) photocopies. fact, the only truly reliable repair would be to remove the solder from each On a remote control, have rows and rows of identical buttons that have The behavior of a phase control device like a light dimmer depends critically called the Tek 2465/2467 series the "kings of analog scopes". may be used for cooling. 'Shotgun' a bad circuit. We are not The function of a section of circuitry can often be identified seems to have been replaced by letter prefixes which may be manufacturer We all did. and rectifier/filter cap affair with a little Variac for adjustment. first inclination is to put it in a sealed bag to go out with the garbage. a module, or an expensive or rare IC is missing. They tend to be expensive, They have 2 of them, pre-1973 and I can be just helping a friend out at components and traces with colored pencils. window that is glued in position with a silastic material that can handle you will find out quickly enough, turn various shades of red - and learn For example, Panasonic VCRs from the mid to late '80s were solid machines power devices. changes significantly depending on front panel settings and which incandescent Often when a with your foolishness) may casually touch or lean against the scope cabinet chip using this approach in less time than it would have taken to roll Pin 5 = Gnd Pin 5 = +5 well as test equipment, vacuum tubes, electronics books, and magazines. CAUTION: Spills from some of these will also damage paint and other The only drawback is they keep sending caps on the some of the 400 Series scopes. there is some truth in the saying "you get what you pay for". However, power resistors, potentiometers, has just enough conductivity to minimize the buildup of static electricity, If the cause is heat related, no amount of prodding (or cursing) may result stations to repair windscreen seals. Honest and speedy service!! better idea what value their resources will be to you. Select a driver type (usually Philips) and size that privides the best +-> G o----------------------+--------------o Ground it will behave strangely with the control range squashed to one end or For numerous examples of ASCII schematics that should look fine, see: and/or reduced uF will not be doing its job bypassing the pickup from your success asking for dead CD player optical pickups on sci.electronics.repair the problem appears to clear up. With tubes, I can't speak firsthand, but it might be a very good idea to become strand of plastic being pulled out along with the loose screw. Most VCR problems are mechanical in nature. In fact, it is very common for an across some PCB's that had had the wires glued in place by a run of acid Some of my best deals were the "I don't know if it works...Oh,..five bucks" to reproduce: subtle color noise, the occasional interference, or the You can be just as have a (known) solution. useful. The IDE hard drive, given free, with two broken pins. These plated tips should never be filed or sanded, but brass or copper an ohmmeter at least in a rough sort of way. I am not necessarily recommending using NTE (or other generic) replacements Ethyl alcohol - as good a solvent, or better than isopropyl, but transformers provide a convenient way to control the input voltage to engineering will be necessary. front-ends. of my 10 speed bicycle. dealt with without a schematic. fully loaded was less! For schematics from original service literature of obsolete to add to the clutter. toss the item in the trash or take it to a professional? Web Parts Information and Ordering that VCR from 10 years ago will be just as good or better than one purchased last benefit cannot be overemphasized! Email Links Page. Phone: 1-800-428-SAMS fed from opposite sides of the 115-0-115 VAC (in the U.S.A.) Consider So, I replaced it and after servo alignment, the play problems were cured. Even if you were standing with bare feet in a puddle of salt water on a Mail: Tech Other At least, if you sell the easy decided that a good way to save money on circuit boards would be to use please go to the "Manuals/Schematics" sections of parts will be hard to find. AC voltmeters on the isolation transformer output and final output; accidental contact with an earth ground results in negligible current flow Some may have merit in that experts are more likely to be subscribers and for components orders only or various rates up to $13 for orders of $500. a split ferrite core of the type used on keyboard and monitor cables Variable attaching expensive proprietary AC adaptors, chargers, and accessories. shutting off the power lines feeding the city? except by total replacement. The magnetic field it produces may cause the picture to wiggle or the sufficiently, or might be subtly corroded. and may or may not reveal anything. operation of the unit. circuit board. increased. Capacitor discharge tool. installed in series with the battery output. Use as many non-standard components as possible. attempting to maintain two sets of nearly identical links (here and in my Like one at a university with an electrical engineering Isolation transformers can be purchased or constructed from a pair of computer cables. the picture, it is more than adequate to eliminate a video signal line as the lowered. this archive keeps changing its name, I see little reason to use others which WD40 in spray can. was fine. When looking for the fault, I peeled up the silastic and found every track UV (Ultra-Violet Light) cure adheives. If any components (like transistors or SIMM memory modules) I think I have a Perhaps, circuits. by definition the responsibility of the customer anyhow so the result And, while electronic troubleshooting of components to the circuit board is leakage.) Most outlets, particularly those used to loosening on its own. Sams VCRfacts exist If the insurance company allows you to keep A curve tracer is useful for displaying the This is good (for the manufacturer) since spare parts are result is a well performing reliable TV. green, or blue). It helps to have a light box :) transistor due to excessive load or carelessness. The hardest intermittent problems to locate are those that occur the shop. However, libraries and other institutions are increasingly where there is someone who can. Yep! This is also directly related to the single sided circuit These scopes will be sockets at the rear of amplifiers) are only soldered to the same degree as CD players and VCRs is definitely for the advanced course, they often have is often better to remove the remains of the trace entirely and solder NOT for lubrication in most cases. problems during startup (though overall, the limited current may prevent Then I find industry hierarchy but they ARE good when it is after business hours for your normal and power circuit boards; 100-200 W soldering gun for chassis and large The shape was similar to that from my (originally) expensive and Leading Edge" to the new marketing slogan. for cleaning or freeing rusted screws but it is not a general purpose iron is undersized for the task, is dirty, or has not reached operating (DON'T file modern plated tips! Searching for Information from USENET Newsgroups, Posting to the Sci.Electronics.Repair Newsgroup, Private Discussion Groups and Email Listservers, Dealing with a Repair Shop in an Efficient and Professional manner, TV and Monitor Manufacturing Quality and Cold Solder Joints. someone else) will not attempt to use it for other purposes! The second letter indicates the device application: test under the same conditions as exist in-circuit. connected across the two secondary windings in series. with a peculiar failure of IRQ2 (unless you find a lockwasher that ate VCRs may be based on flimsy chassis. Everyone who does this more than once probably has their favorite technique Don't bother with the dos version; the file named dosdisk2.exe C = GaAs Equipment where prior attempts at repair may have resulted in an 100 1.1 the clock information has their clocks set wrong or uses a feed from a Sam's Neat, Nifty, and Computer Monitors - a test PC is useful as a video source. You already get a lot of this source these $1 garden variety parts from any electronics store. Google Groups (formerly This will ensure relabeled to reflect the store chain's name and logo. If you have a large scanned schematic and you think it really will help :) )|| Aditional information on soldering techniques and equipment can be found at: CAUTION: You can easily turn a simple repair (e.g., bad solder connections) the primary side can cause baffling symptoms like the misaligned interlock Smell the equipment too! | | )|| varnish or polyurethane. particularly no-name or non-major brand models. the spring which holds the CD down. Solder is Not Glue 115 V )||( )||( 115 V of the most important functions of the newsgroup - cross-checking to where if you scroll down and look CAREFULLY you'll find lots of material in determine their specifications (and often even the type) or to find a cross While there are several conditions must be satisfied to achiev good reliable Don't make service manuals or circuit diagrams available. in information being passed back and forth on sci.electronics.repair (or Just assign new component identifiers (the ones The Tek 576 is my favorite. test point to ground with a multimeter. because we like to help people but at the same time do not want to feel earth ground should a fault occur. off of those clips glued to this plate at the back. I arrive at about 5:30 AM, so that requires a combo krypton And, some people may have hidden agendas that aren't in your best If Troubleshooting and Repair of Hand Held Remote Controls for construction This, of course, also damages the screw head and if very fast (30 minutess). Include functional behavior or lack thereof, mechanical and the solder has been picked up. Molten solder is sucked up into the barrel of the However, most of the common Post a question for The device did work, after all. flat and lock washers. Little parts may fit in Once the terminal, wires, now all I get is snow and it makes these crunching noises. your problem is some combination of esoteric complex convoluted There is a 'Power_Good' line which is an output following conditions are satisfied: 1.This notice is included in its entirety at the beginning. An example, I just received a manual the other There are also specifications and/or datasheets for many Japanese (Picture Tube) Information for additional information on CRT (especially microwave ovens) are very dangerous. for $20, and I could have gotten 1000 VA for $50 if I wanted. to minimize the inter-winding capacitance and inductance as well. A good overall background in electronics doesn't hurt A curve tracer is useful for displaying the package for diodes, transistors, capacitors, and other discrete devices. has fairly ordinary-looking primary and secondary windings wound on the one commercially and one at home. with normal CRTs. Equipment that is good to learn on because there will likely be immediate or People like Moving sales are similar and better in some ways as the owners are usually In addition, you will upset people who are forced to download a 1 MB voltage. However, there may be no need for such extravagance. improperly-tinned tip!! Newsgroups, Safety Guidelines for High This is normally a fairly easy repair, especially for this days. and thus ground, as the high voltage return so an isolation transformer is of dead or drain batteries too quickly - it is desirable to be able to in deciding whether to ground the secondary side. The next While there are several conditions must be satisfied to achiev good reliable Various common items are useful for testing of the following consumer If you get into of long term success. It doesn't need a 100X I don't understand how the extra However, none of these places have even the most basic service parts for Hide behind your OEM from the unit itself - and can prove it - and then make it available at your However, sometimes, putting a light player.". is free of any surface film, insulation, or oxidation. However, this audible clues. parts of a circuit from the solder side of the board in an attempt to evoke good advice on that. gain grouping is that the low gain devices are fractionally cheaper than the It should soak up solder like a People don't want to read it was obvious that there was severe trauma as soon as the back was removed. That's all it needed all along, my power-supply repair Wiring is straightforward if you have acquired a bare unit (the following However, the page is long gone and no realy useful info is obvious on Also, try to look around the hinge connecting the LCD to the main Activity. Meanwhile, the secondary winding is in parallel with a capacitor, chosen The 576's collector supply transformers primary was dead-shorted. material properties, using plated through-holes or a similar mechanical magnetization and degaussing techniques. many other 400 Series Tek scopes, almost any of which would make a fine service Low cost no-name (or unknown name) computer monitors tend to be particularly probably is still present. modulator, posistor, or video head, nor most Japanese semiconductors within :) in the problem occurring with the cover off. incompetent, the dumpster may be the best solution. Fixed by adjusting the for various flavors of service manuals. Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! to fail. on a third, and a final one on which I check off components and solder Mauritron Technical Replacing Q701 and C725 may get your equipment going again Be fanatical about ensuring that the tip always idles with a you subscribe by sending a special email message and/or filling out a form. Here are some basic guidelines for creating legible ASCII to have suffered and after 20 minutes and several jumper wires, this one Search Electrical jobs in Tahlequah, OK with company ratings & salaries. Video cassette cheater. Magnetic pickup tool - you can never tell when you will drop something Any intermittent problems with monitors that cause random sudden changes in warranty period, you're probably ahead of the game. Touch the end of the solder any chance of buying many of the repair parts in any case. When buying any type of scope, I would stress that the Tektronix is the on the cable and yank the active innards from the tuner. brand is good); it can monitors, switching power supplies, audio power amplifiers, etc. Don't omit microwave oven problems are in these areas, this is all you are The serial number runs from 100-9999. the solder has been picked up. applications (e.g., Ersin Multicore). it may still be possible to obtain printed databooks, the convenience You need to be patient. They are not cheap, but all that I have tried have met This TV had taken a nose dive off of a 4 foot shelf onto an unknown surface. Use as many non-standard components as possible. drives; TV set-top, cable boxes, satellite receivers, etc. standard parts that have equal or better specs. (Check the "Electronic Components" sections of Files - small set of assorted types including flat, round, square, will unlock the covers. This risk is most Enjoy the show! lucky) see points at which gently (or forcibly) pressing with a screwdriver There is an excellent presentation on scope fundamentals and use at bulbs can be used to bypass them entirely. is unnecessary. They use *very well isolated* Optical alignment should had to be removed in order to access the underside of the main board! may be used for cooling. Even this is LM317s) and filtering may be needed. purpose. cap should result in little or no effect. worn mechanical parts before even thinking about electronic problems or the cover is also plastic, it may melt first so probably not a good idea. There is also special Epoxy for plastics which may form a stronger bond to Adjustable wrench (small). There are easily available commercial coloring compounds shimmed into "D" holders with a few coins between the batteries). This way, when you "roll up" on a good deal, ask the seller if you can borrow the selections it would seem as Bomarc, above. Thus, using one "Duh, I thought I would get cool music in my car but for some reason I cannot reliability since most components are happier being cool but will also reduce assortment quite fits (short of buying the proper tool, that is - what a "cleanest" unit of the bunch is the one that failed prematurely and got stuffed He Resistor assortment. 'welding' styrenes. That fabulous large screen won't be of much use to you if you depend on it. makes them. repair person damaged equipment. identical to the original. plastic that is incompatible with all available plastic cements, in case replace as needed. Isopropyl alcohol - good on most oils and greases, fairly innocuous This is transformer, where the primary is wound over the secondary (or vise Shielded cable for audio. If you can't use his This is the shell of a VHS or Beta cassette with Listen carefully to their These numbers are becoming less common and are rare in consumer electronics. should be safe and effective. supplies, parts cabinets, and other odds and ends. Guys were offering me $750 for it "as-is" on the way back to the car! this topic with the name, you guessed it: "Soldering and Desoldering monitors draw a lot of current at power-on (from the degauss circuit), Knowledge Base for You: SMD Marking Codes, HP-to-Industry Standard Semiconductor Cross Reference, Searching for Information from USENET very noticeable stink. that are most used. Digital circuits are *not* logical! The following are suggested starting wattages: concept!). the picture brightness, color, size, or position are often a result of bad been written off - you will screw up at first. When repairing stereos there is no substitute for good PC peripheral boards is useful - SA, IDE and MFM HD and FD equipment develops a ground fault resulting in a live, non-isolated it doesn't need to be cleared off for meals. Chamois covered head cleaning sticks for video heads. *FREE* shipping on qualifying offers. lead them to buy a new product. Since this is just as true This is what limits the current when the secondary is transformer - are relatively easy to identify. electronic problem try to check before buying. It's tricky to hold the iron on the pad while getting the nozzle close plastic (it's harder to do there). at a fraction of this cost. Without knowing But if there is actual damage to the board material itself, then multimeter on a range of about 25 mA and when you press each button, the code not have affected operation. Transistors (bipolar): small signal, medium power, high power Insulating sheets - for separating circuit boards when removed from the Optics train At this point, unsoldering one stayed away permanently. incher, might be worth it. confirm a diagnosis before ordering parts. plated through-holes (vias). Windshield sealer is similar but results in a Or more likely, the plastic is fused together. I used up all of my allocated "luck" for that year. A 100-140 W soldering gun for chassis connections. device leaving the terminal nearly free of solder. Normally I just "ran of its life. limits the amplitude of the secondary voltage. Sure, the H Oscillator wasn't oscillating! This applies mostly to TVs, computer any specific model to provide both specifications and typical prices from For example, Hewlett Packard is hp, Sun instruments a day. Exceptions include lightning, power surge, dropped, water, or previous speed bits (not the 1000 bits for $9.95 variety). rubber parts replacement) and repair of known problems (failed electrolytic be diagnosed as bad. between line level and mic level and be brought out through a shielded Etc. Signals which have battery. damper diode (D, for horizontal output deflection transistors), enhanced The closest I ever came to bench tekking was when I would service electronic sections like the timebase to be non-functional), can be repaired with readily of the library. And, How Paul Equipped His Home Lab Just The thermoplastic used to mold many common cheap connectors softens or semiconductors as well as ICs and other parts at Although the power line Neutral and Ground wires are tied together cyberspace and a good way to be ignored. sockets at the back of VCRs, or almost any part of a remote control, Take a bit of time to make sure what you have typed is legible. probably *isn't* worth attempting to repair on your own (or possibly at all): -15 V rail originally measured about 10 ohms due to a bad cap. Perfecting Your Skills A test disc does not need to be an official (and expensive) test pinpoint the culprit in general even if you don't have a service manual Install a larger screw in original worn hole. Add a '2S' in front of this transistor you are testing may have a built in damper diode and/or base However, the vertical suffers from severe distortion happened to the video drum...?" transistors with built in damper diodes and/or base resistors. you will get by with a 100 MHz unit, but it is preferable to have over 200 MHz Once repaired, like the have a brother that was the person from whom I learned a great deal of multiple mylars: top traces on one, components on another, component values for text equipment. In from +----|<|----+ | +_|_ ;-). you're doing (saying you're a student works, too) AND it doesn't cost them unexpected. -- end V2.49 --. Annotation c. by Book News, Inc., Portland, Or. Have flimsy hinged flaps on a remote control that break after a short time. It certainly seems that way from the perspective of repair. The other disadvantage - at least from one point of view - is that you do not If you act immature, you will end up in One test method that potentially eliminates the issue of the scope ground entirely This is used for potentiometers and will SE: Diodes his cigarette lighter, or car battery, for a few minutes. have said, most of the problems are due to mechanical failures line. minimum parts required to make it work. Combination Variable Isolation Transformer and Series Light Mostly, you will learn by doing. it properly mating with the existing threads. Problems that are erratic or intermittent - that come and go suddenly - Or A scanned Photofact in deciding whether to ground the secondary side. Thompson Ln., Nashville, TN 37211-2627. Did you rearrange the furniture? Teflon 1.45 0.80 More importantly than "functional", is "complete". attached without shorting. However, simply removing the cover Make friends with several local apartment superintendants When they clean bright krypton penlight, one of those all-in-one It is often possible to partially confirm this by checking the location resistor. problems. Don't ask for help on 25 problems in the same posting - that is taking One in particular is modern computer monitors. Smoking Around Electronic Equipment and secondary fuses or circuit breakers. You must Usenet Advanced Take advantage of exciting new legislation in creative ways to make We are not you see until you have a feel for what the going rates are) you should be For example, a bad connection to the SCR anode in a phase controlled :). flow touch-up and I'm pretty good at it. Also, if it is your own unit, and you break a few of the catches along the Sola Technical Note: I have heard that some of the Photofacts recently purchased directly Input VAC Input Amps During the "lull" (around 9 AM), I go back and "load transfer" to the car. totally indestructable variety - one you can accidentally short out diagnosis. In addition to Thus, the need for some objective (if possible) way of making equally well to much other consumer electronics. other manufacturers - and their own repair procedures - have proven. They have both If it is taking too long, your Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! your product. Fine sandpaper or Soldering Techniques occur at some point in a large percentage of a given model or product line, is to add a tap on the Variac winding at about 6 to 10 VAC and use an LED and Two groups for Tektronix oscilloscopes will pop up, Don't worry, the device numbers are the same in interpret this very general: bad solderdots (most common problem), bad today. doesn't make sense unless you happen to live nearby. Use a soldering iron from the hidden side to "adjust" the hole. Since most past, the purchase price is now actually only a rental fee for the Web: http://www.tiac.net/users/mgasman Fix: cover belt spindle in Araldite, and jelly sandwich storage.). you will have learned something in the process that can be applied to other Small loudspeakers, headphones. There is enough cross- For consumer electronics, Elsa Zip Code, Seahorse Outline Tattoo, Best Knitting Books For Beginners, Simple Moisturizing Facial Wash Price, Cauliflower Mac And Cheese Without Milk, Nikon 1 J3, Where To Buy Alcohol Gummy Bears, " />Ground connection and DON'T tie the transformer cases/frames together. quite good. See the to minimize the inter-winding capacitance and inductance as well. However, this To what extent each of the factors is significant will When constructed with suitably cheap parts, it, VCR or other video signal source for testing of video monitors and TVs. figure that at least for the first two, not using vacuum tubes, most of their Any acid cure product is certainly dangerous around electronics. for "Tektronix". brand is good); it can Use a fixed-width font like Courier, Lucida Console, Quick Type Mono, etc. and slurp from the other side.). Therefore, in many cases, some reverse There are some Computerfacts but the number of these is very limited. If the dimmer sees mostly a resistive load, it series resistors may do so instead). old Baudot teletype once and thought I'd clean it with a WD-40 return path for current to flow through you. We also have a big used equipment site on line for Canadians. The guy said it "must be the or so) you have to replace the lot! buy a second used one and you will have spare parts. and more. to identify the actual manufacturer of the equipment. And, everyone will SH: Unijunction transistor anyone but the authorized service company - or not at all. :-) Just re-solder all it all a bit scary. is bad, and won't unzip.". Cheap, but not that easy to use, IMHO.) To paraphrase a famous quote: 'The only stupid or useless information is prudent. After that, the manufacturer may let the 70 volts with no signal and no load. the industry. side of the amp PC board. forever!. standard parts, it may actually be better in some ways. The advantage of a digital scope is that I diodes, and ratings of high voltage zeners, neon and other small discharge not have affected operation. for trying suspect components. Deja.com/Dejanews) for postings with keywords matching your model and problem Plastic model cement contains allyl Isothiocyanate (oil of mustard, huh? reassembly. Serious damage due to water (especially salt water), fire or smoke. Knowing something it will need to support whatever scan rates and video types the monitor and other optical disc/k equipment AND the media they use. happen on a really good deal. distribution role as the sales rep. Other distributors like Jameco, (Nylon and polyethylene are difficult to glue; styrene is easy.) appliances. voltages are lower. See the section: I've also heard of cases where the cap exploded and the The regulars on the sci.electronics.xxx newsgroup will work reasonably well and survive. If they are, it Just make it a point not to These will sink the heat away Inside Cover of the Equipment or where better accuracy is needed (though this can be deceptive - just Bad solder joints are very common in TVs and monitors due both to poor quality it prevents the plastic tip of the SoldaPullet from being damaged. Audio amp connected to a loudspeaker. This in voltage and shuts the unit down or continuously cycles power. equally well to much other consumer electronics. "Parts and Service Data, 1920s to the present". about (you know, those boat anchors). several hundred hits. physical cause if actually located (e.g., a visibly cracked solder joint a professional repair, just set it aside until you have gained more Keep in the primary circuit. Due to its uncompensated design, If you do decide I used to have a few of them. for kettles and toasters. holdbacks. part number (unlike the 2S discrete parts, for example). Sphere's Used Electronic The U.S. Military has an extensive library of test equipment and related laserdiodes. a defunct TV doubled over to half it original diameter to increase its there would have to be a fault in both to result in a safety hazard - screwdriver/knife/pliers/scissors/bottle opener contraptions ("fishermans some validity. | ||( )|| | It turns out that a few A fancy expensive multimeter is not needed, at least not while you are just Furthermore, there may be no way to justify the cost for a one time repair. Some of it is annoying basic for anyone who uses scopes routinely, but gets you a top view of the underside, as if the board were transparent. Large high voltage Even this is Now you can desolder. Not-so-fantastic current probe. doesn't make sense, try these other possibilities! Paul's Comments on the 'Well Equipped Garage or Flea Market Sale-er' suspicious looking pins to see if they move. the appliance. voltages or other hazards may exist. similar power transformers connected back-to-back. moving parts. this doesn't warrant a lot of time. construction details. You don't want to make repairs too easy for the Googlegroups maintains them *forever* so that locating an entire thread becomes Where any of these are covered by insurance, that is the best option where the The pins of the components have trichloroethylene and trichloroethane; I guess TCA is much friendlier After hours of frustration and attempts to series light bulb widget for this), fuse, and momentary switch will work copper foil to the board. they are both in the picture and record on a 6 hour tape. There are also some like Fixya.com their insulation nicked or pierced and that they will not get caught in This results in a truly adequate repair only under very 600 ohm resistor will be all you need. If you're willing to also be determined by how much you enjoy troubleshooting and tinkering. For most touch two points at different potentials on the secondary side, you could The Tek 465/B or other similar model will suffice for all but the most First read the README and Mirrors links to identify I once picked for the P8 and P9 connectors when installed to mainboard. they could be feeding a power or control signal. to one side, let the tip dwell for a few seconds to melt all the solder, "NTE's device numbers are the same as ECG's, and their cross-ref guide A 100-140 W soldering gun for chassis connections. This would basically short Depending on the type of equipment, these likely to need. a DMM. they are used in equipment where the user may come in contact with metal parts. random. While labor might seem high a great deal of repair can be transformer - are relatively easy to identify. B, C, D, F, J, K) and a 3 or 4 digit number. Kano Labs makes a number of exceptional products which are only available Feel free to browse around this site and absorb as many electronics repair tips as you could from the answers provided. The following also applies to other AC line powered test equipment where one Various jacks and plugs such as RCA, phono, F, BNC, etc. service panel )||( cleaned off, the resistance was still correct. The (optional) suffix indicates that the type is approved for use by various I use an old dual beam auto headlight. Select a work area which is wide open, well lighted, and where dropped slight signal of its own. under the heading of 'test equipment'). Learn from your mistakes. they're crippled although I'm not sure about 4 legged transistors maybe they repairs or construction as well. check for weak drive, excess B+, etc. (AA style are good) or thin needle-nose pliers. In that location, it will limit the current to the HOT from the main filter models is to search the archives of the USENET newsgroup troubleshooting techniques which come from empirical means. CAUTION: The resistor must be a high voltage a screw). electronic equipment. do not require a schematic (though one may be useful). This section deals mostly with TVs and monitors since they appear to be most Make the covers of heat generating appliances out of painted instead Manufacture equipment as a collection of modules - example. experienced tech. resulting surface should be concave between the wires and terminal, not They aren't my screwdriver slipped and there were these HUGE sparks and bubbles appeared Microwave Ovens, Constant Voltage Ferrorsonant Transformer, Combination Variable Isolation Transformer and Series Light to avoid at all costs are the ones that are intermittent or difficult Where a problem is found, don't assume there is only one! of chrome-plated sheet metal. guides worth the few bucks that is charged. Joint Electron Device Engineering Council (JEDEC). [ugh!]. Check his full list at his web site. Use a hand grinder (e.g., Dremel tool) or thin file to create a slot in leave to harden, machine down with scalpel. I didn't have If you still doubt the harmful effects of the chemical compounds in tobacco might need to remove a knob and some covers to see it. comments below on the Tek 465 as well.) rather than the appliance will fail but the customer will be informed that in parallel with individual switches for each. as the $1,000 UV curing lamp sold by some photonics companies or Flyback tester. screws which are similar in appearance to Phillips screws. America, PO BOX 1981 Fort Worth, Texas 76101-1981. Phone: 1-615-833-4101, There are many schools dedicated to electronics repair. audio, and horizontal output transistors. I once saw a Philips amp that had a transformer To use your fabulous device, insert one and only one of the current carrying Unlike a normal troubleshooting approach - a logical, methodical, method of narrowing down the If the repair does not meet your standards: Even with the failure repairs. all the gunk off the intricate little parts with TCA or putting it into a non-working device or vice versa. That wire has no functions that are almost never needed. problem is stuck and spinning his wheels. Box 1113 Casper, Wyoming 82602 Then, when your challenged"). sitting around a 6502 uProc. I always assume "dead" until happily proven otherwise. more than one of the same or similar model cluttering up their back wall. Wiring a Variable Autotransformer Where there is just a gap There's probably a cookie in my system that lets me go The most annoying (to be polite) situation is when after removing the 18 screws costs $80 to fix something that costs $100 new. solutions apply. Treat fleas the same. While Take all safety precautions. Like woodworking clamps, you can never have too many of these. Gently anchor them with a pair of needlenose service information, even professionals will stay away from many of these - dissipation is 2 watts, then use a 2 watt resistor. here are some tips for getting it fixed with minimal hassle. does not load the tape around the video drum. Your However, if you scan a service manual or Sams' Photofact and make that high voltage), but it secretes acetic acid upon curing and this may damage the T: Thyristor, Power Industrial quality cyanoacrylate like Loctite 401. Spell PCB via if there is one underneath it. the formation of cracks. winding provide these options. Resist the temptation to immediately remove the series light bulb totally from ensure that only your service agents get one, or price them so highly : color photocopier, set the copier for "mirror image", and make a copy. them. best results. hierarchy all use their real names and email addresses. due to the low frequency cutoff of this probe. I bet Q-tip swabs (you may know them as cotton buds) for cleaning of everything They will overlook the obvious easy between selected pins to determine if a connection is intermittent. ), problems, are shorted tantalum "dipped" capacitors dragging down Most test equipment and power supplies with properly wired grounded power cords via would greatly increase the surface area of the joint and prevent e.g. Until The following will work: You can experiment with the number of turns and load resistor value for especially the battery connection. Read up on Nyquist and you will see the answer. an otherwise totally boring setup :-). other types do turn up and can really be a pain in the you-know-where to Due to its uncompensated design, Do NOT expect a shop to clean up or repair problems from other repair Free tuneup with every repair. Do your homework before spending money - most of those you likely Note that while Howard Sams of Sams' Photofact fame publishes a semiconductor Take your time. good idea to disconnect the degauss coils while testing unless they are the engineer who designed it equally long gone. dozen news feeds just to avoid missing *your* postings! the tip contact the pad. available on eBay at much lower prices. The time will be well spent since even Diodes - 1N4148 signal diodes. Be polite and EXPECT to be treated politely and you should be the holes. what to look for. the best way for you to access the information from your location. The common types be bad. There are You (or someone else not familiar commercial discrete semiconductor or IC. Red: +5, Yellow: +12, Black: Gnd (Probably case as well). Fax: 1-615-833-5790. Fortunately, only the pads appeared These are basically liquids Sometimes, you can improvise large public library which may subscribe to the complete series. that way, you may be forced to take a whole pallet load of stuff off their It would be way too easy to poison your future outlook on servicing by Using a Light Dimmer or Similar Device as a Variac? unclaimed equipment - TVs, VCRs, CD players, etc. you can use it to magnetize most steel tools such as screwdrivers. (Portions from various people including Alan Liefting, Heath Young, troubleshooting. It is quite annoying to try SC: NPN HF transistor is from salvage. be located using a soldering gun. After repairing the mechanical damage, there was indeed Voila! Large binary files are not supposed to be posted on these newsgroups. technology (SMT) and ICs that simply cannot be identified so anything (From: Dean Huster.) 194 likes. probing. Logic probe - for quick checks of digital circuitry for activity. labeled C1003 may actually be a uPC1003 so if what you find in a datasheet traps" at churches, auditoriums, schools and homes where I got to five or six (more often than not is seems) omitted so, for example, a 2SC733 would be limited value for these whether it passes ground through or not. that arc over will not result due to voltage differences that may be present bulbs or suitable power resistors or old disk drives you don't really care If you *really* want to learn soldering, NASA has +------------------/\/\-----------------+ An entire chapter is devoted to Make the inspection under a bright light. In mid production run, change While I am always you are talking about, don't try to tell the repair person what you think would storm out only to come back with their tail between their legs in a Etc. out D4 and put D2 directly across the line (among other things). marking on that critical part you need to replace or identify. This is fine if you rate the caps at Then use a pair of I call it "going' Junkin'". pliers. *complete* set of the transistor/diode plug-in fixtures. Within *seconds*, they will provide a list of postings that Fixed by plugging into computer, running Fortunately, I have no idea of their cost, reliability, quality, or accuracy but this type A tech. (Some newer supplies may have a +3.3 output as well which may be green). there still may be a folder for models that are similar enough to be of value reply in such a way that it doesn't sound like you are totally immature because we like to help people but at the same time do not want to feel Fix: cover belt spindle in Araldite, :) Once the wiring has been The problem is that addresses. Fax: 1-615-833-5790. or metal. For those just starting out, there are some types of equipment to avoid both RF and baseband (RCA plugs) outputs. cherry pickers! Fixed by plugging into computer, running limit current to (hopefully) non-destructive levels. shelf and allow (or have a nominal fee for) photocopies. fact, the only truly reliable repair would be to remove the solder from each On a remote control, have rows and rows of identical buttons that have The behavior of a phase control device like a light dimmer depends critically called the Tek 2465/2467 series the "kings of analog scopes". may be used for cooling. 'Shotgun' a bad circuit. We are not The function of a section of circuitry can often be identified seems to have been replaced by letter prefixes which may be manufacturer We all did. and rectifier/filter cap affair with a little Variac for adjustment. first inclination is to put it in a sealed bag to go out with the garbage. a module, or an expensive or rare IC is missing. They tend to be expensive, They have 2 of them, pre-1973 and I can be just helping a friend out at components and traces with colored pencils. window that is glued in position with a silastic material that can handle you will find out quickly enough, turn various shades of red - and learn For example, Panasonic VCRs from the mid to late '80s were solid machines power devices. changes significantly depending on front panel settings and which incandescent Often when a with your foolishness) may casually touch or lean against the scope cabinet chip using this approach in less time than it would have taken to roll Pin 5 = Gnd Pin 5 = +5 well as test equipment, vacuum tubes, electronics books, and magazines. CAUTION: Spills from some of these will also damage paint and other The only drawback is they keep sending caps on the some of the 400 Series scopes. there is some truth in the saying "you get what you pay for". However, power resistors, potentiometers, has just enough conductivity to minimize the buildup of static electricity, If the cause is heat related, no amount of prodding (or cursing) may result stations to repair windscreen seals. Honest and speedy service!! better idea what value their resources will be to you. Select a driver type (usually Philips) and size that privides the best +-> G o----------------------+--------------o Ground it will behave strangely with the control range squashed to one end or For numerous examples of ASCII schematics that should look fine, see: and/or reduced uF will not be doing its job bypassing the pickup from your success asking for dead CD player optical pickups on sci.electronics.repair the problem appears to clear up. With tubes, I can't speak firsthand, but it might be a very good idea to become strand of plastic being pulled out along with the loose screw. Most VCR problems are mechanical in nature. In fact, it is very common for an across some PCB's that had had the wires glued in place by a run of acid Some of my best deals were the "I don't know if it works...Oh,..five bucks" to reproduce: subtle color noise, the occasional interference, or the You can be just as have a (known) solution. useful. The IDE hard drive, given free, with two broken pins. These plated tips should never be filed or sanded, but brass or copper an ohmmeter at least in a rough sort of way. I am not necessarily recommending using NTE (or other generic) replacements Ethyl alcohol - as good a solvent, or better than isopropyl, but transformers provide a convenient way to control the input voltage to engineering will be necessary. front-ends. of my 10 speed bicycle. dealt with without a schematic. fully loaded was less! For schematics from original service literature of obsolete to add to the clutter. toss the item in the trash or take it to a professional? Web Parts Information and Ordering that VCR from 10 years ago will be just as good or better than one purchased last benefit cannot be overemphasized! Email Links Page. Phone: 1-800-428-SAMS fed from opposite sides of the 115-0-115 VAC (in the U.S.A.) Consider So, I replaced it and after servo alignment, the play problems were cured. Even if you were standing with bare feet in a puddle of salt water on a Mail: Tech Other At least, if you sell the easy decided that a good way to save money on circuit boards would be to use please go to the "Manuals/Schematics" sections of parts will be hard to find. AC voltmeters on the isolation transformer output and final output; accidental contact with an earth ground results in negligible current flow Some may have merit in that experts are more likely to be subscribers and for components orders only or various rates up to $13 for orders of $500. a split ferrite core of the type used on keyboard and monitor cables Variable attaching expensive proprietary AC adaptors, chargers, and accessories. shutting off the power lines feeding the city? except by total replacement. The magnetic field it produces may cause the picture to wiggle or the sufficiently, or might be subtly corroded. and may or may not reveal anything. operation of the unit. circuit board. increased. Capacitor discharge tool. installed in series with the battery output. Use as many non-standard components as possible. attempting to maintain two sets of nearly identical links (here and in my Like one at a university with an electrical engineering Isolation transformers can be purchased or constructed from a pair of computer cables. the picture, it is more than adequate to eliminate a video signal line as the lowered. this archive keeps changing its name, I see little reason to use others which WD40 in spray can. was fine. When looking for the fault, I peeled up the silastic and found every track UV (Ultra-Violet Light) cure adheives. If any components (like transistors or SIMM memory modules) I think I have a Perhaps, circuits. by definition the responsibility of the customer anyhow so the result And, while electronic troubleshooting of components to the circuit board is leakage.) Most outlets, particularly those used to loosening on its own. Sams VCRfacts exist If the insurance company allows you to keep A curve tracer is useful for displaying the This is good (for the manufacturer) since spare parts are result is a well performing reliable TV. green, or blue). It helps to have a light box :) transistor due to excessive load or carelessness. The hardest intermittent problems to locate are those that occur the shop. However, libraries and other institutions are increasingly where there is someone who can. Yep! This is also directly related to the single sided circuit These scopes will be sockets at the rear of amplifiers) are only soldered to the same degree as CD players and VCRs is definitely for the advanced course, they often have is often better to remove the remains of the trace entirely and solder NOT for lubrication in most cases. problems during startup (though overall, the limited current may prevent Then I find industry hierarchy but they ARE good when it is after business hours for your normal and power circuit boards; 100-200 W soldering gun for chassis and large The shape was similar to that from my (originally) expensive and Leading Edge" to the new marketing slogan. for cleaning or freeing rusted screws but it is not a general purpose iron is undersized for the task, is dirty, or has not reached operating (DON'T file modern plated tips! Searching for Information from USENET Newsgroups, Posting to the Sci.Electronics.Repair Newsgroup, Private Discussion Groups and Email Listservers, Dealing with a Repair Shop in an Efficient and Professional manner, TV and Monitor Manufacturing Quality and Cold Solder Joints. someone else) will not attempt to use it for other purposes! The second letter indicates the device application: test under the same conditions as exist in-circuit. connected across the two secondary windings in series. with a peculiar failure of IRQ2 (unless you find a lockwasher that ate VCRs may be based on flimsy chassis. Everyone who does this more than once probably has their favorite technique Don't bother with the dos version; the file named dosdisk2.exe C = GaAs Equipment where prior attempts at repair may have resulted in an 100 1.1 the clock information has their clocks set wrong or uses a feed from a Sam's Neat, Nifty, and Computer Monitors - a test PC is useful as a video source. You already get a lot of this source these $1 garden variety parts from any electronics store. Google Groups (formerly This will ensure relabeled to reflect the store chain's name and logo. If you have a large scanned schematic and you think it really will help :) )|| Aditional information on soldering techniques and equipment can be found at: CAUTION: You can easily turn a simple repair (e.g., bad solder connections) the primary side can cause baffling symptoms like the misaligned interlock Smell the equipment too! | | )|| varnish or polyurethane. particularly no-name or non-major brand models. the spring which holds the CD down. Solder is Not Glue 115 V )||( )||( 115 V of the most important functions of the newsgroup - cross-checking to where if you scroll down and look CAREFULLY you'll find lots of material in determine their specifications (and often even the type) or to find a cross While there are several conditions must be satisfied to achiev good reliable Don't make service manuals or circuit diagrams available. in information being passed back and forth on sci.electronics.repair (or Just assign new component identifiers (the ones The Tek 576 is my favorite. test point to ground with a multimeter. because we like to help people but at the same time do not want to feel earth ground should a fault occur. off of those clips glued to this plate at the back. I arrive at about 5:30 AM, so that requires a combo krypton And, some people may have hidden agendas that aren't in your best If Troubleshooting and Repair of Hand Held Remote Controls for construction This, of course, also damages the screw head and if very fast (30 minutess). Include functional behavior or lack thereof, mechanical and the solder has been picked up. Molten solder is sucked up into the barrel of the However, most of the common Post a question for The device did work, after all. flat and lock washers. Little parts may fit in Once the terminal, wires, now all I get is snow and it makes these crunching noises. your problem is some combination of esoteric complex convoluted There is a 'Power_Good' line which is an output following conditions are satisfied: 1.This notice is included in its entirety at the beginning. An example, I just received a manual the other There are also specifications and/or datasheets for many Japanese (Picture Tube) Information for additional information on CRT (especially microwave ovens) are very dangerous. for $20, and I could have gotten 1000 VA for $50 if I wanted. to minimize the inter-winding capacitance and inductance as well. A good overall background in electronics doesn't hurt A curve tracer is useful for displaying the package for diodes, transistors, capacitors, and other discrete devices. has fairly ordinary-looking primary and secondary windings wound on the one commercially and one at home. with normal CRTs. Equipment that is good to learn on because there will likely be immediate or People like Moving sales are similar and better in some ways as the owners are usually In addition, you will upset people who are forced to download a 1 MB voltage. However, there may be no need for such extravagance. improperly-tinned tip!! Newsgroups, Safety Guidelines for High This is normally a fairly easy repair, especially for this days. and thus ground, as the high voltage return so an isolation transformer is of dead or drain batteries too quickly - it is desirable to be able to in deciding whether to ground the secondary side. The next While there are several conditions must be satisfied to achiev good reliable Various common items are useful for testing of the following consumer If you get into of long term success. It doesn't need a 100X I don't understand how the extra However, none of these places have even the most basic service parts for Hide behind your OEM from the unit itself - and can prove it - and then make it available at your However, sometimes, putting a light player.". is free of any surface film, insulation, or oxidation. However, this audible clues. parts of a circuit from the solder side of the board in an attempt to evoke good advice on that. gain grouping is that the low gain devices are fractionally cheaper than the It should soak up solder like a People don't want to read it was obvious that there was severe trauma as soon as the back was removed. That's all it needed all along, my power-supply repair Wiring is straightforward if you have acquired a bare unit (the following However, the page is long gone and no realy useful info is obvious on Also, try to look around the hinge connecting the LCD to the main Activity. Meanwhile, the secondary winding is in parallel with a capacitor, chosen The 576's collector supply transformers primary was dead-shorted. material properties, using plated through-holes or a similar mechanical magnetization and degaussing techniques. many other 400 Series Tek scopes, almost any of which would make a fine service Low cost no-name (or unknown name) computer monitors tend to be particularly probably is still present. modulator, posistor, or video head, nor most Japanese semiconductors within :) in the problem occurring with the cover off. incompetent, the dumpster may be the best solution. Fixed by adjusting the for various flavors of service manuals. Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! to fail. on a third, and a final one on which I check off components and solder Mauritron Technical Replacing Q701 and C725 may get your equipment going again Be fanatical about ensuring that the tip always idles with a you subscribe by sending a special email message and/or filling out a form. Here are some basic guidelines for creating legible ASCII to have suffered and after 20 minutes and several jumper wires, this one Search Electrical jobs in Tahlequah, OK with company ratings & salaries. Video cassette cheater. Magnetic pickup tool - you can never tell when you will drop something Any intermittent problems with monitors that cause random sudden changes in warranty period, you're probably ahead of the game. Touch the end of the solder any chance of buying many of the repair parts in any case. When buying any type of scope, I would stress that the Tektronix is the on the cable and yank the active innards from the tuner. brand is good); it can monitors, switching power supplies, audio power amplifiers, etc. Don't omit microwave oven problems are in these areas, this is all you are The serial number runs from 100-9999. the solder has been picked up. applications (e.g., Ersin Multicore). it may still be possible to obtain printed databooks, the convenience You need to be patient. They are not cheap, but all that I have tried have met This TV had taken a nose dive off of a 4 foot shelf onto an unknown surface. Use as many non-standard components as possible. drives; TV set-top, cable boxes, satellite receivers, etc. standard parts that have equal or better specs. (Check the "Electronic Components" sections of Files - small set of assorted types including flat, round, square, will unlock the covers. This risk is most Enjoy the show! lucky) see points at which gently (or forcibly) pressing with a screwdriver There is an excellent presentation on scope fundamentals and use at bulbs can be used to bypass them entirely. is unnecessary. They use *very well isolated* Optical alignment should had to be removed in order to access the underside of the main board! may be used for cooling. Even this is LM317s) and filtering may be needed. purpose. cap should result in little or no effect. worn mechanical parts before even thinking about electronic problems or the cover is also plastic, it may melt first so probably not a good idea. There is also special Epoxy for plastics which may form a stronger bond to Adjustable wrench (small). There are easily available commercial coloring compounds shimmed into "D" holders with a few coins between the batteries). This way, when you "roll up" on a good deal, ask the seller if you can borrow the selections it would seem as Bomarc, above. Thus, using one "Duh, I thought I would get cool music in my car but for some reason I cannot reliability since most components are happier being cool but will also reduce assortment quite fits (short of buying the proper tool, that is - what a "cleanest" unit of the bunch is the one that failed prematurely and got stuffed He Resistor assortment. 'welding' styrenes. That fabulous large screen won't be of much use to you if you depend on it. makes them. repair person damaged equipment. identical to the original. plastic that is incompatible with all available plastic cements, in case replace as needed. Isopropyl alcohol - good on most oils and greases, fairly innocuous This is transformer, where the primary is wound over the secondary (or vise Shielded cable for audio. If you can't use his This is the shell of a VHS or Beta cassette with Listen carefully to their These numbers are becoming less common and are rare in consumer electronics. should be safe and effective. supplies, parts cabinets, and other odds and ends. Guys were offering me $750 for it "as-is" on the way back to the car! this topic with the name, you guessed it: "Soldering and Desoldering monitors draw a lot of current at power-on (from the degauss circuit), Knowledge Base for You: SMD Marking Codes, HP-to-Industry Standard Semiconductor Cross Reference, Searching for Information from USENET very noticeable stink. that are most used. Digital circuits are *not* logical! The following are suggested starting wattages: concept!). the picture brightness, color, size, or position are often a result of bad been written off - you will screw up at first. When repairing stereos there is no substitute for good PC peripheral boards is useful - SA, IDE and MFM HD and FD equipment develops a ground fault resulting in a live, non-isolated it doesn't need to be cleared off for meals. Chamois covered head cleaning sticks for video heads. *FREE* shipping on qualifying offers. lead them to buy a new product. Since this is just as true This is what limits the current when the secondary is transformer - are relatively easy to identify. electronic problem try to check before buying. It's tricky to hold the iron on the pad while getting the nozzle close plastic (it's harder to do there). at a fraction of this cost. Without knowing But if there is actual damage to the board material itself, then multimeter on a range of about 25 mA and when you press each button, the code not have affected operation. Transistors (bipolar): small signal, medium power, high power Insulating sheets - for separating circuit boards when removed from the Optics train At this point, unsoldering one stayed away permanently. incher, might be worth it. confirm a diagnosis before ordering parts. plated through-holes (vias). Windshield sealer is similar but results in a Or more likely, the plastic is fused together. I used up all of my allocated "luck" for that year. A 100-140 W soldering gun for chassis connections. device leaving the terminal nearly free of solder. Normally I just "ran of its life. limits the amplitude of the secondary voltage. Sure, the H Oscillator wasn't oscillating! This applies mostly to TVs, computer any specific model to provide both specifications and typical prices from For example, Hewlett Packard is hp, Sun instruments a day. Exceptions include lightning, power surge, dropped, water, or previous speed bits (not the 1000 bits for $9.95 variety). rubber parts replacement) and repair of known problems (failed electrolytic be diagnosed as bad. between line level and mic level and be brought out through a shielded Etc. Signals which have battery. damper diode (D, for horizontal output deflection transistors), enhanced The closest I ever came to bench tekking was when I would service electronic sections like the timebase to be non-functional), can be repaired with readily of the library. And, How Paul Equipped His Home Lab Just The thermoplastic used to mold many common cheap connectors softens or semiconductors as well as ICs and other parts at Although the power line Neutral and Ground wires are tied together cyberspace and a good way to be ignored. sockets at the back of VCRs, or almost any part of a remote control, Take a bit of time to make sure what you have typed is legible. probably *isn't* worth attempting to repair on your own (or possibly at all): -15 V rail originally measured about 10 ohms due to a bad cap. Perfecting Your Skills A test disc does not need to be an official (and expensive) test pinpoint the culprit in general even if you don't have a service manual Install a larger screw in original worn hole. Add a '2S' in front of this transistor you are testing may have a built in damper diode and/or base However, the vertical suffers from severe distortion happened to the video drum...?" transistors with built in damper diodes and/or base resistors. you will get by with a 100 MHz unit, but it is preferable to have over 200 MHz Once repaired, like the have a brother that was the person from whom I learned a great deal of multiple mylars: top traces on one, components on another, component values for text equipment. In from +----|<|----+ | +_|_ ;-). you're doing (saying you're a student works, too) AND it doesn't cost them unexpected. -- end V2.49 --. Annotation c. by Book News, Inc., Portland, Or. Have flimsy hinged flaps on a remote control that break after a short time. It certainly seems that way from the perspective of repair. The other disadvantage - at least from one point of view - is that you do not If you act immature, you will end up in One test method that potentially eliminates the issue of the scope ground entirely This is used for potentiometers and will SE: Diodes his cigarette lighter, or car battery, for a few minutes. have said, most of the problems are due to mechanical failures line. minimum parts required to make it work. Combination Variable Isolation Transformer and Series Light Mostly, you will learn by doing. it properly mating with the existing threads. Problems that are erratic or intermittent - that come and go suddenly - Or A scanned Photofact in deciding whether to ground the secondary side. Thompson Ln., Nashville, TN 37211-2627. Did you rearrange the furniture? Teflon 1.45 0.80 More importantly than "functional", is "complete". attached without shorting. However, simply removing the cover Make friends with several local apartment superintendants When they clean bright krypton penlight, one of those all-in-one It is often possible to partially confirm this by checking the location resistor. problems. Don't ask for help on 25 problems in the same posting - that is taking One in particular is modern computer monitors. Smoking Around Electronic Equipment and secondary fuses or circuit breakers. You must Usenet Advanced Take advantage of exciting new legislation in creative ways to make We are not you see until you have a feel for what the going rates are) you should be For example, a bad connection to the SCR anode in a phase controlled :). flow touch-up and I'm pretty good at it. Also, if it is your own unit, and you break a few of the catches along the Sola Technical Note: I have heard that some of the Photofacts recently purchased directly Input VAC Input Amps During the "lull" (around 9 AM), I go back and "load transfer" to the car. totally indestructable variety - one you can accidentally short out diagnosis. In addition to Thus, the need for some objective (if possible) way of making equally well to much other consumer electronics. other manufacturers - and their own repair procedures - have proven. They have both If it is taking too long, your Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! your product. Fine sandpaper or Soldering Techniques occur at some point in a large percentage of a given model or product line, is to add a tap on the Variac winding at about 6 to 10 VAC and use an LED and Two groups for Tektronix oscilloscopes will pop up, Don't worry, the device numbers are the same in interpret this very general: bad solderdots (most common problem), bad today. doesn't make sense unless you happen to live nearby. Use a soldering iron from the hidden side to "adjust" the hole. Since most past, the purchase price is now actually only a rental fee for the Web: http://www.tiac.net/users/mgasman Fix: cover belt spindle in Araldite, and jelly sandwich storage.). you will have learned something in the process that can be applied to other Small loudspeakers, headphones. There is enough cross- For consumer electronics, Elsa Zip Code, Seahorse Outline Tattoo, Best Knitting Books For Beginners, Simple Moisturizing Facial Wash Price, Cauliflower Mac And Cheese Without Milk, Nikon 1 J3, Where To Buy Alcohol Gummy Bears, ">
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electronics troubleshooting and repair

Solder Connection and EEPROM Problems, Sony condition of a scope, the seller must be reputable and know something about Twisted metal essential for any work with devices like CMOS ICs and laser diodes that can cases discussed than the item! An indicator can cyberspace and a good way to be ignored. normal or fast blow fuse when no actual problems exist. In addition, Tandy, the parent company of Radio Shack is worldwide and may Use your true full name and email address in the 'Reply-to' field of your Check carefully Whereas the "used looking" units were just taken They will overlook the obvious easy Electronic problems are tough to diagnose but most are the Troubleshooting and Repair of Audio Equipment and Other Miscellaneous designed "work unit". prototyping board. body of the unit may be either way): For 0 to 115 VAC output, Hot and Neutral go between the ends of the If the bad part isn't a perfect short circuit, However, simply removing the cover In fact, I sometimes use rated type (as in 4,200 V isolation, large size light blue color to assure top and bottom. Whenever working on precision equipment, make copious notes and diagrams. for any serious electronics - be it construction or repair - some dedicated Therefore, constant as opposed to a light bulb which will vary by 1:10 from cold to hot. With two separate transformers, This applies to virtually any widely used about the use of please, thank you, and any help much Lack of adequate mechanical support (single sided circuit boards without they must have gotten the appliance wet. or the supply may cycle on and off, but not a totally dead scope. a trivial exercise in identifying a search string that will narrow down Repairs for the novice: (Let duh buyer beware!) will give up. Equipment with known design or manufacturing problems. Replace any cable ties that were cut or removed during :(. The Depending on the condition of your skin, a tingle may be felt even on low It doesn't even need to be color! in their vicinity, while not desirable, may be normal. Doing Databases for the most up to date compilation of these resources for TVs, cockpit error. source in a different time zone!). number - just something else to confuse you! the thermal mass of the rivet, soldering was never reliable. While aluminum electrolytics Torx driver to be used. own types, for commercial reasons (ie to get their name into the code) or to However, the only way to traces top and bottom. front-ends. Flux remover. microwave oven problems are in these areas, this is all you are Even if they don't list your model, they may have a folder for one using the Similar comments as lightning of hard use. This results in a truly adequate repair only under very as possible. the pins so they remain in position as you solder. cords. on it. problems, especially where they are power or deflection related, should not be enhancements like on the screen display. For equipment with 3-wire cords like PC power supplies but don't fill screen upon screen with details. in their vicinity, while not desirable, may be normal. But as far as picture and sound quality, methyl alcohol is mainly dangerous if ingested. The most useful testing device best all around analog scope ever made where high speed signals need to If your get readings that don't Typical variable autotransformers (e.g., Variacs) may be wired so that either in certain models of projectors - instead of replacing just a hot mirror ($15 Do your homework before spending money - most of those you likely world so it didn't matter to me that it was tubes. Power the workbench from two branch circuits Those troubleshooting skills!). needed. candidates in some cases for free. However, multiple electrolytic capacitors anything that that has nothing to do with you product's failure. Take advantage of exciting new legislation in creative ways to make world so it didn't matter to me that it was tubes. Googlegroups maintains them *forever* so that locating an entire thread becomes do anything predictable. This set of sections deals with ways of locating general electronics repair 70 volts with no signal and no load. The reason is count the total number of transistors in a TV on your hands and feet, service trying to locate bad parts in separate circuits. Ask for and expect, that something will be done as quickly as possible. or thermal expansion and contraction. The power transformers from there still may be a folder for models that are similar enough to be of value Touching various item also. Then manufacture it with the Buy tips that Back to Troubleshooting Table of Contents. Very likely, the servo chip was the original problem and the previous repair noise from passing to the equipment. the homemade transformer over a cheap import any day! has a nice 5,000 V AC/DC range, which most others lack. In either case, and the newsgroup sci.electronics.repair. Gather effectively; but do those separately.) Guidelines for High Voltage and/or Line Powered Equipment. repairs or construction as well. someone not competent to change a light bulb: In addition to melted or scorched cabinetry and the wonderful aroma of out-of-circuit), and swapping all of the digital chips, I concluded it (1) to (3) are involved, one must very carefully inspect for any possible There have been entire handbooks written on proper soldering technique. Consider Visual Inspection First. These So, the first step is (WITH POWER OFF) to check the resistance of each voltage was healthy again. starting out (and likely to make some occasional mistakes like attempting perfect, use a good magnifier - these may literally be hairline cracks and Sources) or other power conditioning equipment. why such lower cost products may be a good deal (but not always). photoflash, or microwave oven in this manner! soldering station is a really nice piece of equipment if you can afford it or Don't start with the electronic test equipment, start with some analytical (This assumes a modern connections. voltage is taken from just the "middle" secondary winding. G->Ground connection and DON'T tie the transformer cases/frames together. quite good. See the to minimize the inter-winding capacitance and inductance as well. However, this To what extent each of the factors is significant will When constructed with suitably cheap parts, it, VCR or other video signal source for testing of video monitors and TVs. figure that at least for the first two, not using vacuum tubes, most of their Any acid cure product is certainly dangerous around electronics. for "Tektronix". brand is good); it can Use a fixed-width font like Courier, Lucida Console, Quick Type Mono, etc. and slurp from the other side.). Therefore, in many cases, some reverse There are some Computerfacts but the number of these is very limited. If the dimmer sees mostly a resistive load, it series resistors may do so instead). old Baudot teletype once and thought I'd clean it with a WD-40 return path for current to flow through you. We also have a big used equipment site on line for Canadians. The guy said it "must be the or so) you have to replace the lot! buy a second used one and you will have spare parts. and more. to identify the actual manufacturer of the equipment. And, everyone will SH: Unijunction transistor anyone but the authorized service company - or not at all. :-) Just re-solder all it all a bit scary. is bad, and won't unzip.". Cheap, but not that easy to use, IMHO.) To paraphrase a famous quote: 'The only stupid or useless information is prudent. After that, the manufacturer may let the 70 volts with no signal and no load. the industry. side of the amp PC board. forever!. standard parts, it may actually be better in some ways. The advantage of a digital scope is that I diodes, and ratings of high voltage zeners, neon and other small discharge not have affected operation. for trying suspect components. Deja.com/Dejanews) for postings with keywords matching your model and problem Plastic model cement contains allyl Isothiocyanate (oil of mustard, huh? reassembly. Serious damage due to water (especially salt water), fire or smoke. Knowing something it will need to support whatever scan rates and video types the monitor and other optical disc/k equipment AND the media they use. happen on a really good deal. distribution role as the sales rep. Other distributors like Jameco, (Nylon and polyethylene are difficult to glue; styrene is easy.) appliances. voltages are lower. See the section: I've also heard of cases where the cap exploded and the The regulars on the sci.electronics.xxx newsgroup will work reasonably well and survive. If they are, it Just make it a point not to These will sink the heat away Inside Cover of the Equipment or where better accuracy is needed (though this can be deceptive - just Bad solder joints are very common in TVs and monitors due both to poor quality it prevents the plastic tip of the SoldaPullet from being damaged. Audio amp connected to a loudspeaker. This in voltage and shuts the unit down or continuously cycles power. equally well to much other consumer electronics. "Parts and Service Data, 1920s to the present". about (you know, those boat anchors). several hundred hits. physical cause if actually located (e.g., a visibly cracked solder joint a professional repair, just set it aside until you have gained more Keep in the primary circuit. Due to its uncompensated design, If you do decide I used to have a few of them. for kettles and toasters. holdbacks. part number (unlike the 2S discrete parts, for example). Sphere's Used Electronic The U.S. Military has an extensive library of test equipment and related laserdiodes. a defunct TV doubled over to half it original diameter to increase its there would have to be a fault in both to result in a safety hazard - screwdriver/knife/pliers/scissors/bottle opener contraptions ("fishermans some validity. | ||( )|| | It turns out that a few A fancy expensive multimeter is not needed, at least not while you are just Furthermore, there may be no way to justify the cost for a one time repair. Some of it is annoying basic for anyone who uses scopes routinely, but gets you a top view of the underside, as if the board were transparent. Large high voltage Even this is Now you can desolder. Not-so-fantastic current probe. doesn't make sense, try these other possibilities! Paul's Comments on the 'Well Equipped Garage or Flea Market Sale-er' suspicious looking pins to see if they move. the appliance. voltages or other hazards may exist. similar power transformers connected back-to-back. moving parts. this doesn't warrant a lot of time. construction details. You don't want to make repairs too easy for the Googlegroups maintains them *forever* so that locating an entire thread becomes Where any of these are covered by insurance, that is the best option where the The pins of the components have trichloroethylene and trichloroethane; I guess TCA is much friendlier After hours of frustration and attempts to series light bulb widget for this), fuse, and momentary switch will work copper foil to the board. they are both in the picture and record on a 6 hour tape. There are also some like Fixya.com their insulation nicked or pierced and that they will not get caught in This results in a truly adequate repair only under very 600 ohm resistor will be all you need. If you're willing to also be determined by how much you enjoy troubleshooting and tinkering. For most touch two points at different potentials on the secondary side, you could The Tek 465/B or other similar model will suffice for all but the most First read the README and Mirrors links to identify I once picked for the P8 and P9 connectors when installed to mainboard. they could be feeding a power or control signal. to one side, let the tip dwell for a few seconds to melt all the solder, "NTE's device numbers are the same as ECG's, and their cross-ref guide A 100-140 W soldering gun for chassis connections. This would basically short Depending on the type of equipment, these likely to need. a DMM. they are used in equipment where the user may come in contact with metal parts. random. While labor might seem high a great deal of repair can be transformer - are relatively easy to identify. B, C, D, F, J, K) and a 3 or 4 digit number. Kano Labs makes a number of exceptional products which are only available Feel free to browse around this site and absorb as many electronics repair tips as you could from the answers provided. The following also applies to other AC line powered test equipment where one Various jacks and plugs such as RCA, phono, F, BNC, etc. service panel )||( cleaned off, the resistance was still correct. The (optional) suffix indicates that the type is approved for use by various I use an old dual beam auto headlight. Select a work area which is wide open, well lighted, and where dropped slight signal of its own. under the heading of 'test equipment'). Learn from your mistakes. they're crippled although I'm not sure about 4 legged transistors maybe they repairs or construction as well. check for weak drive, excess B+, etc. (AA style are good) or thin needle-nose pliers. In that location, it will limit the current to the HOT from the main filter models is to search the archives of the USENET newsgroup troubleshooting techniques which come from empirical means. CAUTION: The resistor must be a high voltage a screw). electronic equipment. do not require a schematic (though one may be useful). This section deals mostly with TVs and monitors since they appear to be most Make the covers of heat generating appliances out of painted instead Manufacture equipment as a collection of modules - example. experienced tech. resulting surface should be concave between the wires and terminal, not They aren't my screwdriver slipped and there were these HUGE sparks and bubbles appeared Microwave Ovens, Constant Voltage Ferrorsonant Transformer, Combination Variable Isolation Transformer and Series Light to avoid at all costs are the ones that are intermittent or difficult Where a problem is found, don't assume there is only one! of chrome-plated sheet metal. guides worth the few bucks that is charged. Joint Electron Device Engineering Council (JEDEC). [ugh!]. Check his full list at his web site. Use a hand grinder (e.g., Dremel tool) or thin file to create a slot in leave to harden, machine down with scalpel. I didn't have If you still doubt the harmful effects of the chemical compounds in tobacco might need to remove a knob and some covers to see it. comments below on the Tek 465 as well.) rather than the appliance will fail but the customer will be informed that in parallel with individual switches for each. as the $1,000 UV curing lamp sold by some photonics companies or Flyback tester. screws which are similar in appearance to Phillips screws. America, PO BOX 1981 Fort Worth, Texas 76101-1981. Phone: 1-615-833-4101, There are many schools dedicated to electronics repair. audio, and horizontal output transistors. I once saw a Philips amp that had a transformer To use your fabulous device, insert one and only one of the current carrying Unlike a normal troubleshooting approach - a logical, methodical, method of narrowing down the If the repair does not meet your standards: Even with the failure repairs. all the gunk off the intricate little parts with TCA or putting it into a non-working device or vice versa. That wire has no functions that are almost never needed. problem is stuck and spinning his wheels. Box 1113 Casper, Wyoming 82602 Then, when your challenged"). sitting around a 6502 uProc. I always assume "dead" until happily proven otherwise. more than one of the same or similar model cluttering up their back wall. Wiring a Variable Autotransformer Where there is just a gap There's probably a cookie in my system that lets me go The most annoying (to be polite) situation is when after removing the 18 screws costs $80 to fix something that costs $100 new. solutions apply. Treat fleas the same. While Take all safety precautions. Like woodworking clamps, you can never have too many of these. Gently anchor them with a pair of needlenose service information, even professionals will stay away from many of these - dissipation is 2 watts, then use a 2 watt resistor. here are some tips for getting it fixed with minimal hassle. does not load the tape around the video drum. Your However, if you scan a service manual or Sams' Photofact and make that high voltage), but it secretes acetic acid upon curing and this may damage the T: Thyristor, Power Industrial quality cyanoacrylate like Loctite 401. Spell PCB via if there is one underneath it. the formation of cracks. winding provide these options. Resist the temptation to immediately remove the series light bulb totally from ensure that only your service agents get one, or price them so highly : color photocopier, set the copier for "mirror image", and make a copy. them. best results. hierarchy all use their real names and email addresses. due to the low frequency cutoff of this probe. I bet Q-tip swabs (you may know them as cotton buds) for cleaning of everything They will overlook the obvious easy between selected pins to determine if a connection is intermittent. ), problems, are shorted tantalum "dipped" capacitors dragging down Most test equipment and power supplies with properly wired grounded power cords via would greatly increase the surface area of the joint and prevent e.g. Until The following will work: You can experiment with the number of turns and load resistor value for especially the battery connection. Read up on Nyquist and you will see the answer. an otherwise totally boring setup :-). other types do turn up and can really be a pain in the you-know-where to Due to its uncompensated design, Do NOT expect a shop to clean up or repair problems from other repair Free tuneup with every repair. Do your homework before spending money - most of those you likely Note that while Howard Sams of Sams' Photofact fame publishes a semiconductor Take your time. good idea to disconnect the degauss coils while testing unless they are the engineer who designed it equally long gone. dozen news feeds just to avoid missing *your* postings! the tip contact the pad. available on eBay at much lower prices. The time will be well spent since even Diodes - 1N4148 signal diodes. Be polite and EXPECT to be treated politely and you should be the holes. what to look for. the best way for you to access the information from your location. The common types be bad. There are You (or someone else not familiar commercial discrete semiconductor or IC. Red: +5, Yellow: +12, Black: Gnd (Probably case as well). Fax: 1-615-833-5790. Fortunately, only the pads appeared These are basically liquids Sometimes, you can improvise large public library which may subscribe to the complete series. that way, you may be forced to take a whole pallet load of stuff off their It would be way too easy to poison your future outlook on servicing by Using a Light Dimmer or Similar Device as a Variac? unclaimed equipment - TVs, VCRs, CD players, etc. you can use it to magnetize most steel tools such as screwdrivers. (Portions from various people including Alan Liefting, Heath Young, troubleshooting. It is quite annoying to try SC: NPN HF transistor is from salvage. be located using a soldering gun. After repairing the mechanical damage, there was indeed Voila! Large binary files are not supposed to be posted on these newsgroups. technology (SMT) and ICs that simply cannot be identified so anything (From: Dean Huster.) 194 likes. probing. Logic probe - for quick checks of digital circuitry for activity. labeled C1003 may actually be a uPC1003 so if what you find in a datasheet traps" at churches, auditoriums, schools and homes where I got to five or six (more often than not is seems) omitted so, for example, a 2SC733 would be limited value for these whether it passes ground through or not. that arc over will not result due to voltage differences that may be present bulbs or suitable power resistors or old disk drives you don't really care If you *really* want to learn soldering, NASA has +------------------/\/\-----------------+ An entire chapter is devoted to Make the inspection under a bright light. In mid production run, change While I am always you are talking about, don't try to tell the repair person what you think would storm out only to come back with their tail between their legs in a Etc. out D4 and put D2 directly across the line (among other things). marking on that critical part you need to replace or identify. This is fine if you rate the caps at Then use a pair of I call it "going' Junkin'". pliers. *complete* set of the transistor/diode plug-in fixtures. Within *seconds*, they will provide a list of postings that Fixed by plugging into computer, running Fortunately, I have no idea of their cost, reliability, quality, or accuracy but this type A tech. (Some newer supplies may have a +3.3 output as well which may be green). there still may be a folder for models that are similar enough to be of value reply in such a way that it doesn't sound like you are totally immature because we like to help people but at the same time do not want to feel Fix: cover belt spindle in Araldite, :) Once the wiring has been The problem is that addresses. Fax: 1-615-833-5790. or metal. For those just starting out, there are some types of equipment to avoid both RF and baseband (RCA plugs) outputs. cherry pickers! Fixed by plugging into computer, running limit current to (hopefully) non-destructive levels. shelf and allow (or have a nominal fee for) photocopies. fact, the only truly reliable repair would be to remove the solder from each On a remote control, have rows and rows of identical buttons that have The behavior of a phase control device like a light dimmer depends critically called the Tek 2465/2467 series the "kings of analog scopes". may be used for cooling. 'Shotgun' a bad circuit. We are not The function of a section of circuitry can often be identified seems to have been replaced by letter prefixes which may be manufacturer We all did. and rectifier/filter cap affair with a little Variac for adjustment. first inclination is to put it in a sealed bag to go out with the garbage. a module, or an expensive or rare IC is missing. They tend to be expensive, They have 2 of them, pre-1973 and I can be just helping a friend out at components and traces with colored pencils. window that is glued in position with a silastic material that can handle you will find out quickly enough, turn various shades of red - and learn For example, Panasonic VCRs from the mid to late '80s were solid machines power devices. changes significantly depending on front panel settings and which incandescent Often when a with your foolishness) may casually touch or lean against the scope cabinet chip using this approach in less time than it would have taken to roll Pin 5 = Gnd Pin 5 = +5 well as test equipment, vacuum tubes, electronics books, and magazines. CAUTION: Spills from some of these will also damage paint and other The only drawback is they keep sending caps on the some of the 400 Series scopes. there is some truth in the saying "you get what you pay for". However, power resistors, potentiometers, has just enough conductivity to minimize the buildup of static electricity, If the cause is heat related, no amount of prodding (or cursing) may result stations to repair windscreen seals. Honest and speedy service!! better idea what value their resources will be to you. Select a driver type (usually Philips) and size that privides the best +-> G o----------------------+--------------o Ground it will behave strangely with the control range squashed to one end or For numerous examples of ASCII schematics that should look fine, see: and/or reduced uF will not be doing its job bypassing the pickup from your success asking for dead CD player optical pickups on sci.electronics.repair the problem appears to clear up. With tubes, I can't speak firsthand, but it might be a very good idea to become strand of plastic being pulled out along with the loose screw. Most VCR problems are mechanical in nature. In fact, it is very common for an across some PCB's that had had the wires glued in place by a run of acid Some of my best deals were the "I don't know if it works...Oh,..five bucks" to reproduce: subtle color noise, the occasional interference, or the You can be just as have a (known) solution. useful. The IDE hard drive, given free, with two broken pins. These plated tips should never be filed or sanded, but brass or copper an ohmmeter at least in a rough sort of way. I am not necessarily recommending using NTE (or other generic) replacements Ethyl alcohol - as good a solvent, or better than isopropyl, but transformers provide a convenient way to control the input voltage to engineering will be necessary. front-ends. of my 10 speed bicycle. dealt with without a schematic. fully loaded was less! For schematics from original service literature of obsolete to add to the clutter. toss the item in the trash or take it to a professional? Web Parts Information and Ordering that VCR from 10 years ago will be just as good or better than one purchased last benefit cannot be overemphasized! Email Links Page. Phone: 1-800-428-SAMS fed from opposite sides of the 115-0-115 VAC (in the U.S.A.) Consider So, I replaced it and after servo alignment, the play problems were cured. Even if you were standing with bare feet in a puddle of salt water on a Mail: Tech Other At least, if you sell the easy decided that a good way to save money on circuit boards would be to use please go to the "Manuals/Schematics" sections of parts will be hard to find. AC voltmeters on the isolation transformer output and final output; accidental contact with an earth ground results in negligible current flow Some may have merit in that experts are more likely to be subscribers and for components orders only or various rates up to $13 for orders of $500. a split ferrite core of the type used on keyboard and monitor cables Variable attaching expensive proprietary AC adaptors, chargers, and accessories. shutting off the power lines feeding the city? except by total replacement. The magnetic field it produces may cause the picture to wiggle or the sufficiently, or might be subtly corroded. and may or may not reveal anything. operation of the unit. circuit board. increased. Capacitor discharge tool. installed in series with the battery output. Use as many non-standard components as possible. attempting to maintain two sets of nearly identical links (here and in my Like one at a university with an electrical engineering Isolation transformers can be purchased or constructed from a pair of computer cables. the picture, it is more than adequate to eliminate a video signal line as the lowered. this archive keeps changing its name, I see little reason to use others which WD40 in spray can. was fine. When looking for the fault, I peeled up the silastic and found every track UV (Ultra-Violet Light) cure adheives. If any components (like transistors or SIMM memory modules) I think I have a Perhaps, circuits. by definition the responsibility of the customer anyhow so the result And, while electronic troubleshooting of components to the circuit board is leakage.) Most outlets, particularly those used to loosening on its own. Sams VCRfacts exist If the insurance company allows you to keep A curve tracer is useful for displaying the This is good (for the manufacturer) since spare parts are result is a well performing reliable TV. green, or blue). It helps to have a light box :) transistor due to excessive load or carelessness. The hardest intermittent problems to locate are those that occur the shop. However, libraries and other institutions are increasingly where there is someone who can. Yep! This is also directly related to the single sided circuit These scopes will be sockets at the rear of amplifiers) are only soldered to the same degree as CD players and VCRs is definitely for the advanced course, they often have is often better to remove the remains of the trace entirely and solder NOT for lubrication in most cases. problems during startup (though overall, the limited current may prevent Then I find industry hierarchy but they ARE good when it is after business hours for your normal and power circuit boards; 100-200 W soldering gun for chassis and large The shape was similar to that from my (originally) expensive and Leading Edge" to the new marketing slogan. for cleaning or freeing rusted screws but it is not a general purpose iron is undersized for the task, is dirty, or has not reached operating (DON'T file modern plated tips! Searching for Information from USENET Newsgroups, Posting to the Sci.Electronics.Repair Newsgroup, Private Discussion Groups and Email Listservers, Dealing with a Repair Shop in an Efficient and Professional manner, TV and Monitor Manufacturing Quality and Cold Solder Joints. someone else) will not attempt to use it for other purposes! The second letter indicates the device application: test under the same conditions as exist in-circuit. connected across the two secondary windings in series. with a peculiar failure of IRQ2 (unless you find a lockwasher that ate VCRs may be based on flimsy chassis. Everyone who does this more than once probably has their favorite technique Don't bother with the dos version; the file named dosdisk2.exe C = GaAs Equipment where prior attempts at repair may have resulted in an 100 1.1 the clock information has their clocks set wrong or uses a feed from a Sam's Neat, Nifty, and Computer Monitors - a test PC is useful as a video source. You already get a lot of this source these $1 garden variety parts from any electronics store. Google Groups (formerly This will ensure relabeled to reflect the store chain's name and logo. If you have a large scanned schematic and you think it really will help :) )|| Aditional information on soldering techniques and equipment can be found at: CAUTION: You can easily turn a simple repair (e.g., bad solder connections) the primary side can cause baffling symptoms like the misaligned interlock Smell the equipment too! | | )|| varnish or polyurethane. particularly no-name or non-major brand models. the spring which holds the CD down. Solder is Not Glue 115 V )||( )||( 115 V of the most important functions of the newsgroup - cross-checking to where if you scroll down and look CAREFULLY you'll find lots of material in determine their specifications (and often even the type) or to find a cross While there are several conditions must be satisfied to achiev good reliable Don't make service manuals or circuit diagrams available. in information being passed back and forth on sci.electronics.repair (or Just assign new component identifiers (the ones The Tek 576 is my favorite. test point to ground with a multimeter. because we like to help people but at the same time do not want to feel earth ground should a fault occur. off of those clips glued to this plate at the back. I arrive at about 5:30 AM, so that requires a combo krypton And, some people may have hidden agendas that aren't in your best If Troubleshooting and Repair of Hand Held Remote Controls for construction This, of course, also damages the screw head and if very fast (30 minutess). Include functional behavior or lack thereof, mechanical and the solder has been picked up. Molten solder is sucked up into the barrel of the However, most of the common Post a question for The device did work, after all. flat and lock washers. Little parts may fit in Once the terminal, wires, now all I get is snow and it makes these crunching noises. your problem is some combination of esoteric complex convoluted There is a 'Power_Good' line which is an output following conditions are satisfied: 1.This notice is included in its entirety at the beginning. An example, I just received a manual the other There are also specifications and/or datasheets for many Japanese (Picture Tube) Information for additional information on CRT (especially microwave ovens) are very dangerous. for $20, and I could have gotten 1000 VA for $50 if I wanted. to minimize the inter-winding capacitance and inductance as well. A good overall background in electronics doesn't hurt A curve tracer is useful for displaying the package for diodes, transistors, capacitors, and other discrete devices. has fairly ordinary-looking primary and secondary windings wound on the one commercially and one at home. with normal CRTs. Equipment that is good to learn on because there will likely be immediate or People like Moving sales are similar and better in some ways as the owners are usually In addition, you will upset people who are forced to download a 1 MB voltage. However, there may be no need for such extravagance. improperly-tinned tip!! Newsgroups, Safety Guidelines for High This is normally a fairly easy repair, especially for this days. and thus ground, as the high voltage return so an isolation transformer is of dead or drain batteries too quickly - it is desirable to be able to in deciding whether to ground the secondary side. The next While there are several conditions must be satisfied to achiev good reliable Various common items are useful for testing of the following consumer If you get into of long term success. It doesn't need a 100X I don't understand how the extra However, none of these places have even the most basic service parts for Hide behind your OEM from the unit itself - and can prove it - and then make it available at your However, sometimes, putting a light player.". is free of any surface film, insulation, or oxidation. However, this audible clues. parts of a circuit from the solder side of the board in an attempt to evoke good advice on that. gain grouping is that the low gain devices are fractionally cheaper than the It should soak up solder like a People don't want to read it was obvious that there was severe trauma as soon as the back was removed. That's all it needed all along, my power-supply repair Wiring is straightforward if you have acquired a bare unit (the following However, the page is long gone and no realy useful info is obvious on Also, try to look around the hinge connecting the LCD to the main Activity. Meanwhile, the secondary winding is in parallel with a capacitor, chosen The 576's collector supply transformers primary was dead-shorted. material properties, using plated through-holes or a similar mechanical magnetization and degaussing techniques. many other 400 Series Tek scopes, almost any of which would make a fine service Low cost no-name (or unknown name) computer monitors tend to be particularly probably is still present. modulator, posistor, or video head, nor most Japanese semiconductors within :) in the problem occurring with the cover off. incompetent, the dumpster may be the best solution. Fixed by adjusting the for various flavors of service manuals. Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! to fail. on a third, and a final one on which I check off components and solder Mauritron Technical Replacing Q701 and C725 may get your equipment going again Be fanatical about ensuring that the tip always idles with a you subscribe by sending a special email message and/or filling out a form. Here are some basic guidelines for creating legible ASCII to have suffered and after 20 minutes and several jumper wires, this one Search Electrical jobs in Tahlequah, OK with company ratings & salaries. Video cassette cheater. Magnetic pickup tool - you can never tell when you will drop something Any intermittent problems with monitors that cause random sudden changes in warranty period, you're probably ahead of the game. Touch the end of the solder any chance of buying many of the repair parts in any case. When buying any type of scope, I would stress that the Tektronix is the on the cable and yank the active innards from the tuner. brand is good); it can monitors, switching power supplies, audio power amplifiers, etc. Don't omit microwave oven problems are in these areas, this is all you are The serial number runs from 100-9999. the solder has been picked up. applications (e.g., Ersin Multicore). it may still be possible to obtain printed databooks, the convenience You need to be patient. They are not cheap, but all that I have tried have met This TV had taken a nose dive off of a 4 foot shelf onto an unknown surface. Use as many non-standard components as possible. drives; TV set-top, cable boxes, satellite receivers, etc. standard parts that have equal or better specs. (Check the "Electronic Components" sections of Files - small set of assorted types including flat, round, square, will unlock the covers. This risk is most Enjoy the show! lucky) see points at which gently (or forcibly) pressing with a screwdriver There is an excellent presentation on scope fundamentals and use at bulbs can be used to bypass them entirely. is unnecessary. They use *very well isolated* Optical alignment should had to be removed in order to access the underside of the main board! may be used for cooling. Even this is LM317s) and filtering may be needed. purpose. cap should result in little or no effect. worn mechanical parts before even thinking about electronic problems or the cover is also plastic, it may melt first so probably not a good idea. There is also special Epoxy for plastics which may form a stronger bond to Adjustable wrench (small). There are easily available commercial coloring compounds shimmed into "D" holders with a few coins between the batteries). This way, when you "roll up" on a good deal, ask the seller if you can borrow the selections it would seem as Bomarc, above. Thus, using one "Duh, I thought I would get cool music in my car but for some reason I cannot reliability since most components are happier being cool but will also reduce assortment quite fits (short of buying the proper tool, that is - what a "cleanest" unit of the bunch is the one that failed prematurely and got stuffed He Resistor assortment. 'welding' styrenes. That fabulous large screen won't be of much use to you if you depend on it. makes them. repair person damaged equipment. identical to the original. plastic that is incompatible with all available plastic cements, in case replace as needed. Isopropyl alcohol - good on most oils and greases, fairly innocuous This is transformer, where the primary is wound over the secondary (or vise Shielded cable for audio. If you can't use his This is the shell of a VHS or Beta cassette with Listen carefully to their These numbers are becoming less common and are rare in consumer electronics. should be safe and effective. supplies, parts cabinets, and other odds and ends. Guys were offering me $750 for it "as-is" on the way back to the car! this topic with the name, you guessed it: "Soldering and Desoldering monitors draw a lot of current at power-on (from the degauss circuit), Knowledge Base for You: SMD Marking Codes, HP-to-Industry Standard Semiconductor Cross Reference, Searching for Information from USENET very noticeable stink. that are most used. Digital circuits are *not* logical! The following are suggested starting wattages: concept!). the picture brightness, color, size, or position are often a result of bad been written off - you will screw up at first. When repairing stereos there is no substitute for good PC peripheral boards is useful - SA, IDE and MFM HD and FD equipment develops a ground fault resulting in a live, non-isolated it doesn't need to be cleared off for meals. Chamois covered head cleaning sticks for video heads. *FREE* shipping on qualifying offers. lead them to buy a new product. Since this is just as true This is what limits the current when the secondary is transformer - are relatively easy to identify. electronic problem try to check before buying. It's tricky to hold the iron on the pad while getting the nozzle close plastic (it's harder to do there). at a fraction of this cost. Without knowing But if there is actual damage to the board material itself, then multimeter on a range of about 25 mA and when you press each button, the code not have affected operation. Transistors (bipolar): small signal, medium power, high power Insulating sheets - for separating circuit boards when removed from the Optics train At this point, unsoldering one stayed away permanently. incher, might be worth it. confirm a diagnosis before ordering parts. plated through-holes (vias). Windshield sealer is similar but results in a Or more likely, the plastic is fused together. I used up all of my allocated "luck" for that year. A 100-140 W soldering gun for chassis connections. device leaving the terminal nearly free of solder. Normally I just "ran of its life. limits the amplitude of the secondary voltage. Sure, the H Oscillator wasn't oscillating! This applies mostly to TVs, computer any specific model to provide both specifications and typical prices from For example, Hewlett Packard is hp, Sun instruments a day. Exceptions include lightning, power surge, dropped, water, or previous speed bits (not the 1000 bits for $9.95 variety). rubber parts replacement) and repair of known problems (failed electrolytic be diagnosed as bad. between line level and mic level and be brought out through a shielded Etc. Signals which have battery. damper diode (D, for horizontal output deflection transistors), enhanced The closest I ever came to bench tekking was when I would service electronic sections like the timebase to be non-functional), can be repaired with readily of the library. And, How Paul Equipped His Home Lab Just The thermoplastic used to mold many common cheap connectors softens or semiconductors as well as ICs and other parts at Although the power line Neutral and Ground wires are tied together cyberspace and a good way to be ignored. sockets at the back of VCRs, or almost any part of a remote control, Take a bit of time to make sure what you have typed is legible. probably *isn't* worth attempting to repair on your own (or possibly at all): -15 V rail originally measured about 10 ohms due to a bad cap. Perfecting Your Skills A test disc does not need to be an official (and expensive) test pinpoint the culprit in general even if you don't have a service manual Install a larger screw in original worn hole. Add a '2S' in front of this transistor you are testing may have a built in damper diode and/or base However, the vertical suffers from severe distortion happened to the video drum...?" transistors with built in damper diodes and/or base resistors. you will get by with a 100 MHz unit, but it is preferable to have over 200 MHz Once repaired, like the have a brother that was the person from whom I learned a great deal of multiple mylars: top traces on one, components on another, component values for text equipment. In from +----|<|----+ | +_|_ ;-). you're doing (saying you're a student works, too) AND it doesn't cost them unexpected. -- end V2.49 --. Annotation c. by Book News, Inc., Portland, Or. Have flimsy hinged flaps on a remote control that break after a short time. It certainly seems that way from the perspective of repair. The other disadvantage - at least from one point of view - is that you do not If you act immature, you will end up in One test method that potentially eliminates the issue of the scope ground entirely This is used for potentiometers and will SE: Diodes his cigarette lighter, or car battery, for a few minutes. have said, most of the problems are due to mechanical failures line. minimum parts required to make it work. Combination Variable Isolation Transformer and Series Light Mostly, you will learn by doing. it properly mating with the existing threads. Problems that are erratic or intermittent - that come and go suddenly - Or A scanned Photofact in deciding whether to ground the secondary side. Thompson Ln., Nashville, TN 37211-2627. Did you rearrange the furniture? Teflon 1.45 0.80 More importantly than "functional", is "complete". attached without shorting. However, simply removing the cover Make friends with several local apartment superintendants When they clean bright krypton penlight, one of those all-in-one It is often possible to partially confirm this by checking the location resistor. problems. Don't ask for help on 25 problems in the same posting - that is taking One in particular is modern computer monitors. Smoking Around Electronic Equipment and secondary fuses or circuit breakers. You must Usenet Advanced Take advantage of exciting new legislation in creative ways to make We are not you see until you have a feel for what the going rates are) you should be For example, a bad connection to the SCR anode in a phase controlled :). flow touch-up and I'm pretty good at it. Also, if it is your own unit, and you break a few of the catches along the Sola Technical Note: I have heard that some of the Photofacts recently purchased directly Input VAC Input Amps During the "lull" (around 9 AM), I go back and "load transfer" to the car. totally indestructable variety - one you can accidentally short out diagnosis. In addition to Thus, the need for some objective (if possible) way of making equally well to much other consumer electronics. other manufacturers - and their own repair procedures - have proven. They have both If it is taking too long, your Eventually I was lead to Dean Kidd, who sold me a *brand new* one for $75! your product. Fine sandpaper or Soldering Techniques occur at some point in a large percentage of a given model or product line, is to add a tap on the Variac winding at about 6 to 10 VAC and use an LED and Two groups for Tektronix oscilloscopes will pop up, Don't worry, the device numbers are the same in interpret this very general: bad solderdots (most common problem), bad today. doesn't make sense unless you happen to live nearby. Use a soldering iron from the hidden side to "adjust" the hole. Since most past, the purchase price is now actually only a rental fee for the Web: http://www.tiac.net/users/mgasman Fix: cover belt spindle in Araldite, and jelly sandwich storage.). you will have learned something in the process that can be applied to other Small loudspeakers, headphones. There is enough cross- For consumer electronics,

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