Electronics repair page
- Buy a relatively inexpensive digital multimeter. Learn how to use the multimeter to measure resistance, voltage, and current. A multimeter is an essential tool for all electronics repairs.
- An oscilloscope would also be most useful. Learn how to use the oscilloscope to observe and analyze waveforms. Oscilloscope is needed in many electronics repairs.
- Buy a soldering iron, solder, and desoldering equipment. Learn how to solder and unsolder without damaging the circuit board.
- Find a source where you can buy the replacement parts you need.
- You need to have general tools like screwdivers etc. to open equipment cases and removing components.
- Don't work alone - in the event of an emergency another person's presence may be essential.
- Set up your work area away from possible grounds that you may accidentally contact
- Have a fire extinguisher rated for electrical fires readily accessible in a location that won't get blocked should something burst into flames.
- Wear eye protection - large plastic lensed eyeglasses or safety goggles.
- Always keep one hand in your pocket when anywhere around a powered line-connected or high voltage system.
- Set up your work area away from possible grounds that you may accidentally contact.
- If circuit boards need to be removed from their mountings, put insulating material between the boards and anything they may short to.
- Use an isolation transformer if there is any chance of contacting line connected circuits.
- The use of a GFCI (Ground Fault Circuit Interrupter) protected outlet is a good idea.
- DC leakage: Use a multimeter on the highest OHMS range to measure the resistance between the Hot/Neutral prongs of the wall plug (shorted together and with the power switch on where one exists) to ALL exposed metal parts of the equipment including metallic trim, knobs, connector shells and shields, VHF and UHF antenna connections, etc. This resistance must not be less than 1 M ohm. For the most reliable results you should a special insulation resistance meters (those typically use 250V or 500V voltage for measuring).
- AC leakage: Connect a 1.5K ohm, 10 Watt resistor in parallel with a 0.15 uF, 150 V capacitor to act as a load. Attach this combination between the probes of your multimeter. With the equipment powered up, check between a known earth ground and each exposed metal part of the equipment as above. The potential measured for any exposed metal surface must not exceed 0.75 V. This corresponds to a maximum leakage current of 0.5 mA. A true RMS reading multimeter should be used for this test, especially where the equipment uses a switchmode power supply which may result in very non-sinusoidal leakage current.
- Desoldering - how to remove a component - If you have gotten into the act of building kits, you are inevitably going to face the situation where you need to remove a component that you have soldered on to a pc board. Whatever the case, your desoldering technique can make the difference between a successful effort and a damaged pc board. This guide is for conventional components although some of the steps may be applied to the removal of surface mount components. Rate this link
- Essential Tools - This article details of some of the essential tools you should have in your toolkit if you want to construct electronic circuits or repair electronics devices. The most essential tool is of course the soldering iron, so later in this article there is some guidance on choosing one and some tips on how to master the techniques of soldering. Rate this link
- How to trace out schematics - Tracing out the schematic of a vintage effect is not all that hard to do and has many of the elements of a detecting job. It's always interesting to figure out how an old, unusual circuit works; it may be an effect saver if you have something unusual that you can't find a schematic for that is broken. This process works well with single sided boards. Rate this link
- Safety Guidelines for High Voltage and/or Line Powered Equipment Rate this link
- The Basic De-soldering Guide Photo Gallery (and Black Museum of Bad Soldering) - De-soldering is required when electronic components need to be removed from a circuit, usually because they are faulty. This photo sequence illustrates the basic steps for desoldering a printed circuit board, in order to remove a faulty part. Both a desoldering pump as well as desolder braid are illustrated Rate this link
- Electronics Repair - The schemes and manuals, usefull informations for repair, repair tips, eproms and more. Rate this link
- Electronics Repair Discussion Forum - discussion on repairing electronic devices Rate this link
- Electronics repair FAQ archive Rate this link
- Electronic Repair Center - for Consumers, Electronic Hobbyists & Students, includes FAQ section Rate this link
- Links to companies selling repair manuals and parts Rate this link
- Schematics for Free - free electronics infor & schematic site Rate this link
- Sci.Electronics.Repair FAQ Rate this link
- Service Engineers Forum - The Service Engineers Forum is here to help all Engineers with fault finding Tips, Articles, Products and Free Newsletter. Rate this link
- Silicon Sam's Technology Resource (SSTR) - The "Notes on the Troubleshooting and Repair of..." series was developed to provide a resource for the hobbiest, tinkerer, engineer, weekend mechanic, housewife, dentist, and poet. Rate this link
- On-Line Tech-Tips Databases - A number of organizations have compiled databases covering thousands of common problems with VCRs, TVs, computer monitors, and other electronic equipment. Most charge for their information but a few, accessible via the Internet, are either free or have a very minimal monthly or per-case fee. In other cases, a limited but still useful subset of the for-fee database is freely available. A tech-tips database is a collection of problems and solutions accumulated by the organization providing the information or other sources based on actual repair experiences and case histories. Rate this link
- The Service Engineers Forum - The Service Engineers Forum is dedicated to the needs of engineers in the TV, video, monitor, camcorder and audio electronics repair trade, over 3000 pages of content including new repair tips, servicing articles, circuits, help, for sale, wanted and industry news sections, open access to the site is free to all engineers. Rate this link
- Tips, Tricks & Gadgets from the Technicians themselves Rate this link
- Troubleshooters.Com(R) Rate this link
- How to quiet noisy transformers - How to stop transformer to make mechanical noise. Rate this link
- How to restore vintage broadcasting equipment - This document gives tips how to restore vintage Tv cameras, support equipment, and radios. Rate this link
- Locating the component that is causing the fuse to blow Rate this link
- Looking for bad connections - When looking for that elusive bad connection on a circuit board a plain old toothbrush is your best friend. Simply run the toothbrush over the board till your push the bad connection into working. This works great on cold solder joints. Rate this link
- The linguistics of electronics troubleshooting - Engineers frequently underestimate the time that electronics troubleshooting requires and often completely leave this step out of hardware-development schedules. The proper choice of words leads to more effective troubleshooting. Rate this link
- Repair of Flood Damaged Equipment - Many pieces of electrical or electronic equipment can be repaired after being immersed in flood waters and the basic work is not difficult, although there will be components within the equipment which may not be repairable except by experts Rate this link
- Repair Your Remote Control Keys Rate this link
- Electronic Troubleshooting Rate this link
- A Universal Convergence Technique Rate this link
- FAQ: How To Adjust a TV Rate this link
- High pitched whine or squeal from monitor with no other symptoms - Sometimes this is continuous. In other cases, it comes and goes almost as though there is an intelligence at work attempting to drive you crazy. In most cases, this sound, while annoying, does not indicate an impending failure. You have several options to try to solve this problem. Rate this link
- Homemade CRT Restorer - All CRT restorers, including the most expensive, are based on the same principle appliyng discharges between RGB cathodes and G1 inside the tube to remove from the cathodes microscopical particles deposed on them during the CRT lifetime. Those particles diminish the electron emission, and by removing them the tube may be restored. Rate this link
- Notes On The Troubleshooting And Repair Of Television Sets - This document will provide you with the knowledge to deal with a large percentage of the problems you are likely to encounter with your TVs. It will enable you to diagnose problems and in many cases, correct them as well. With minor exceptions, specific manufacturers and models will not be covered. Rate this link
- Notes on the Troubleshooting and Repair of Computer and Video Monitors Rate this link
- Test Jig - For NAP (Magnavox, Sylvania, Philco, Phillips) console TV sets, a spare 25"or 26" table model set whose chassis has been destroyed by lightning, makes a very good test jig to test the chassis of other TVs. Rate this link
- TV and Monitor Deflection Systems - This document describes basic TV/monitor deflection circuit operation and gives repairing tips. Rate this link
- TV and Monitor Deflection Systems - This document addresses the basic principles of operation of deflection systems used in TVs and monitors. Most of this information applies to the horizontal deflection which operates at the higher frequency in a raster scan display. Equipment which utilizes this circuitry includes TV (direct view as well 3-CRT and light valve projection types), computer and video monitors, tube based video cameras (e.g., vidicon), and other magnetically deflected CRT devices. Rate this link
- TV and Monitor CRT (Picture Tube) Information - This document contains a collection of information relating to CRT (picture tube) construction, characteristics, problems, maintenance, troubleshooting, and repair. Rate this link
- Tv Monitors Schematics and Repair Tips - free discussion group for TV/monitor repair topics Rate this link
- TV vikaohjesivusto - This page has TV repair information in Finnish. Rate this link
- Notes on the Troubleshooting and Repair of Video Cassette Recorders - This document was developed specifically for the troubleshooting and repair of VCRs using the VHS format. However, most of it also applies to Beta, 8 mm, 4 mm (DAT), and the industrial U-Matic formats as well. This document will provide you with the knowledge to deal with over 85% of the problems you are likely to encounter with your VCRs. It will enable you to diagnose problems and in most cases, correct them as well. Rate this link
- Using a Digital Phosphor Oscilloscope for Video Tape Recorder Video Tracking Adjustment - One of the common maintenance tasks for helical-scan video tape recorders (VTRs) is the adjustment of the timing of the heads relative to the video tracks recorded on the tape. The main objective is to assure that any tape recorded on the VTR can be played on another similar machine without requiring any adjustments. The video tracking adjustment, typically done with an analog oscilloscope, requires a lively, gray-scale display. Rate this link
- VCR First Aid - This document is intended to address those problems with your VCR that just cannot wait. Rate this link
- VCR knowledge page - This page is started because of lack of awareness of the Video Cassette Recorder (VCR) time-base errors. This page describes video operation very nicely with pictures and oscilloscope signals. Rate this link
- VCR Repair Guide Rate this link
- VCR Repair Instruction - the self service website Rate this link
- VIDCAM's Fault Pages - a collection of many years of video recorder faults, especially older models Rate this link
- Video Faults - This is a large collection of video repair tips. Rate this link
- Notes on the Troubleshooting and Repair of Audio Equipment and Other Miscellaneous Stuff - This document has information on repairing audio tape equipment, open reel tape equipment, turntables, loudspeakers, telephone equipment and other devices. Rate this link
- Everything you always wanted to know about SPEAKER REPAIR - but were afraid to ask Rate this link
- Foam Surround Rebuild - how to repair damaged speaker surrounds Rate this link
- Speaker Repair - how to repair large speaker elements Rate this link
- Notes on the Troubleshooting and Repair of Compact Disc Players and CDROM Drives - This document was developed specifically for the troubleshooting and repair of the CD players in component stereo systems, compact stereos, boomboxes, car units and portables, as well as CDROM drives (including the Sony Playstation). The purpose of this document is to provide enough background on CD technology and troubleshooting guidance so that anyone who is reasonably handy whether a homeowner, experimenter, hobbiest, tinkerer, or engineer, can identify and repair many problems with CD players and possibly laserdisc players, CDROM drives, and optical storage drives as well. Rate this link
- Notes on the Troubleshooting and Repair of Optical Disc Players and Optical Data Storage Drives - While compact disc (CD) players and CDROM drives account for the vast majority of optical disc platforms in the known universe, there are other types in use for both entertainment and data storage applications. These all use optical technology very similar to that of the compact disc and CDROM. Rate this link
- Infrared Remote Control Test - How to use a handheld video camera to test the operation of IR remote controller. Rate this link
- Inside TV Remote Control - The remote control's job is to wait for you to press a key, and then to translate that key-press into infrared (pronounced "infra-red") light signals that are received by the TV. When you take off the back cover of the control you can see what is inside it. Rate this link
- Notes on the Troubleshooting and Repair of Hand Held Remote Controls Rate this link
- Programming your Universal Remote Control - Lost your manual? Can't figure out how to change the settings on your universal remote control? This webpage is a list of IR remote controller programming resources plus other online locations that offer help on programming various remote controls. Rate this link
- Repair worn carbon rubber contacts Rate this link
- Repair Your Remote Control Keys Rate this link
- Testing remote control using ordinary AM radio receiver Rate this link
- Vintage Radio Repair and Restoration - site dedicated to vintage radio repair and restoration information Rate this link
- Notes on the Repair of Small Household Appliances Rate this link
- Repairing Lamp Plugs Rate this link
- Repairing Lamp Switches Rate this link
- Repairing Wall Electrical Outlets - These rarely cause trouble. Sometimes they get loose and only need tightening. Rate this link
- Sci.Electronics.Repair FAQ Rate this link
- The Complete Microwave Oven Repair and Information Network - Here is the ultimate microwave oven troubleshooting and repair resource with do-it-yourself help and instruction by the experts. When doing any repairs remember that microwave ovens are carefully designed to keep the microwaves inside, and the operator outside during use. Keep it that way. Rate this link
- Boot Failure Troubleshooting Flowchart - a 1 meter square poster for diagnosing PC boot failures Rate this link
- Computer Repair with Diagnostic Flowcharts - This page offers links to flowcharts for diagnosing and repairing PCs, extracted from Computer Repair with Diagnostic Flowcharts book. About half of the published book is online there, including a 1 meter square poster for diagnosing boot failures Rate this link
- Com Port Tester - A simple com port tester for PC's and other DTE/DCE equipment. Verifies port activity, confirms 1488/1489 line drivers receivers are functioning ok. Rate this link
- Computer Monitor Repair Tips Rate this link
- Identifying connections on unknown or cut monitor cables Rate this link
- Monitor Schematics - Here you can find schematics of many computer monitors from various manufacturers including Acer, AOC, Bridge, Compaq, CTX, Daewoo, Datas, DTK, Envision, Hansol, Hitachi, Hyundai, IBM, LG, Goldstar, MAG, Mitac, Nokia, Optiquest, SKD, Samsung, Sony, TCM, Viewsonic and Voltron. Rate this link
- NOAHTEC.Com - infomations on monitor repairing and also spare part Rate this link
- randyfromm.com Technical Department - collection of technical articles on coin-up videogame repair Rate this link
- Repairing LCD's - Most cases the LCD display problems are related to the display back-light bulbs. Rate this link
- SMPS Test Jig - This is a tip how to to test power supplies that will not start without a load. Rate this link
- Testing of Flyback (LOPT) Transformers - This document tells how to test computer monitor flyback transformers. Rate this link
- Tomi Engdahl's PC building and repair link Rate this link
- Computer - Those of us that have used LCD monitors for a while know that over time the backlight starts to dim and will eventually completely fail. Well for less than $20.00 and about a half hour of your time you can replace the backlight and rejuvenate that monitor to as good as new condition. Rate this link
- Basic video game repair information - This is a basic flow chart for basic video machine fault finding. Rate this link
- Pinouts for Various Common Chips and Hybrids Rate this link
- Series Lamp Limiter - connect a 100W lamp bulb in series with the supply to the equipment being repaired to avoid very nadty high short circuit current is something goes seriously wrong, useful for power supply testing and repairing Rate this link
- Troubleshooting and Repair of Consumer Electronics Equipment Rate this link
Electronics repairing information
This page is intended to be used by electronic technicians and other people who know what they are doing. Electronic equipment contains dangerous voltages and can be hazardous to unqualified service personnel. Only those with adequate training, equipment, facilities and experience should attempt to repair any electronic equipment. The information offered on these pages is intended for electronic professionals only. Anyone not qualified or lacking the equipment, facilities or experience for proper and safe electronic repair should consult with a electronic repair professional.
Anyone attempting to repair any electronic equipment who does not fully understand the shock hazards, as well as the fire hazards associated with working with electronic equipment, should not attempt such procedures! Improperly attempted repair can kill you and burn down your house.Devices that plug into the wall can produce a very lethal electric shock as well cause a fire from incorrect or careless repairs both during servicing or later on.Improper repair of battery operated devices can also result in bad consequences for you, the device, and any equipment attached to it.
Why some people do repairs themselved then? If you can do the repairs yourself, the equation changes dramatically asyour parts costs will be 1/2 to 1/4 of what a professional will chargeand of course your time is free. The educational aspects may also beappealing. You also will learn a lot in the process.
Before attempting to repair anythign, learn some electronic theory and fundamentals, so that you will notinjure or kill yourself, and so you will know a bad part when you find one. It is critically important to understand theory of operation and signal-flow if you are to have any hope of repairing most equipment. You need also suitable tools:
In oder to be able to do electronics device servicing safely, you need to know what you are doing and have some safety devices in your workbench.
Please also note the safety on your workplace.
Floating supply in form of safety isolation transformer isused in electronics laboratories to isolate the electronicsequipment being tested or repaired from the mains supply. There are totally floating safety isolating transformers that supply 120/230 volts floating with respect to ground. These are intended for use by test/service engineers working on live mains-supplied equipment. The term 'safety' is relative of course - whilst it is perfectly safe to connect yourself to any single point of such a floating circuit it won't give you any extra protection if you were to touch both live and neutral atthe same time! In other words they only give protection against injury to people who know what they are doing - two strikes and you're out! However an isolating transformer should only be used for a singlepiece of kit. The safety relies on the integrity of the isolation of the entire supply on the secondary side of the transformer. The use of isolated supplies for testing of mains voltage equipment isprimarily to allow the use of older oscilloscopes on live chassis without causing expensive electronic explosions.
It is a good idea to have an earth leakage protector (RCD / GFCI) to safeguard the power feed to yout desk. This device will shut down the mains power (at least in most cases) if you happen to touch the incoming power live wire. The use of a GFCI (Ground Fault Circuit Interrupter) protected outlet is a good idea but may not protect you from shock from many points in a line connected TV or monitor, or the high voltage side of a microwave oven, for example. Please note that GFCI may nuisance trip on some cases. A suitsble fusing on the outlets that you use to power equipment is a good idea. A fuse or circuit breaker is too slow and insensitive to provide any protection for you or in many cases, your equipment. However, these devices may save your scope probe ground wire should you accidentally connect it to a live chassis.
And also consider the ESD issues at your working place, get an ESD safe mat for your table and other things needed. Electronics inside many equipment nowadays is very ESD sensitive. When handling static sensitive components, an anti-static wrist strap is recommended. Use a commercially made anti-static wrist strap that has a high resistance path between you and the groundign point (greater than 100K ohms, usually 1 Mohm).
Be careful whatever you do. 'Carelessness' is a the majority cause of accidents. Don't attempt repair work when you are tired. Not only will you be more careless, but your primary diagnostic tool - deductive reasoning - will not be operating at full capacity. Never assume anything without checking it out for yourself! Don't take shortcuts! Perform as many tests as possible with power off and the equipment unplugged. Do not assume that the chassis is a suitable ground for your test equipment! Since electrocution is permanent it only takes one unluckyinstance of carelessness in an entire career to terminate your contract!
There are simple and more complicated problems. A lot of times when an equipment stops working a fuse has blown. The fuse is there to prevent a fire in case of an excessive current draw inside the unit. Often there is a reason for the fact that fuse blew. So you need to sort out the problem before putting the new fuse in and trying the equipment. Remove what caused the fuse to blow (for example overload in using the equipment). Do not put a new fuse in unless you know that the device you are repairing is ok. By replacing the fuse and not first determining what caused it to blow, you likely caused further damage each additional time the fuse blew. When replacing the fuse remeber to put in the fuse with same rating (same current rating, same or higher voltage rating) and same type (fast or slow).
Visual inspection is a powerful tool in many electronics repair. You can find some bad connections by marks of heating seen around the connection and you can find many mechanical faults in this way. The possibility of finding a failed component with visual inspection depends on how long the short circuit current flowed for and how hot the component became if it went with a big short. Sometimes components are SEVERELY blown (blown capacitor, tops blasted off chips, cracked chips, scorched, charred, colors turned black, that sort of thing). Most other faults will not show at all for a visual inspection. Although "eyeballing a fault" is a common practice and solves many problemswith electronics, it does have it's limitations and more test techniques areneeded to further isolate the problem. Sometimes failed component can be found when it becomes noticably hotter (heats too much) or colder (does not heat as in normal operation) than it is normally used to be. Usually in electronics repair you need a multimeter and oscilloscope to test the operation of the circuit.
High voltages on the equipment can be dangerous. Perform as many tests as possible with power off and the equipment unplugged. If you need to probe, solder, or otherwise touch circuits with power off, discharge (across) large power supply filter capacitors with a 2 W or greater resistor of 100 to 500 ohms/V approximate value (e.g., for a 200 V capacitor, use a 20K to 100K ohm resistor). After discharging erify that there is no residual charge with a suitable voltmeter. Connect/disconnect any test leads with the equipment unpowered and unplugged. Use clip leads or solder temporary wires to reach cramped locations or difficult to access locations. If you must probe live, use test probes that avoid the possibility of an accidental short which could cause damage to various components. If you have probes that can cause shorts and you can't change them, put electrical tape over all but the last 1/16" of the test probes to avoid the possibility of an accidental short. Is ia a very good idea to clip the reference end of the meter or scope to the appropriate ground return so that you need to only probe with one hand.
It is always essential to test AFTER any repairs to assure that no accessible parts of the equipment have inadvertently been shorted to a Hot wire or live point in the power supply. Checking for correct hookup of the Hot, Neutral, and Ground wires to the AC plug should also be standard procedure. In addition to incorrect rewiring, this could result from a faulty part, solder splash, or kinked wire insulation. There are two sets of tests that are commonly used:
Know your equipment. There are special considerations for working on most televisions and other equipment not using a built-in isolation transformer. Most servicers use an isolation transformer for any AC-powered unit under test. Learn the appropriate safety considerations for using the tester and 'scope. TVs and monitors may use parts of the metal chassis as ground return yet the chassis may be electrically live with respect to the earth ground of the AC line. TVs and monitors have capcitors that chan hold charge for long time after the equipment is powered off. If you need to probe, solder, or otherwise touch circuits with power off, discharge (across) large power supply filter capacitors with a suitable resistor. Monitor while discharging and/or verify that there is no residual charge with a suitable voltmeter. In a TV or monitor, if you are removing the high voltage connection to the CRT first discharge the CRT contact contact (it is under the insulating cup at the end of the fat red wire, use a 1M to 10M ohm 1W or greater wattage resistor on the end of an insulating stick to discharge it to equipment chassis ground). For TVs and monitors in particular, there is the additional danger of CRT implosion - take care not to bang the CRT envelope with your tools. An implosion will scatter shards of glass at high velocity in every direction. Always wear eye protection.
Check the liability issues. Remember always that your are personally responsible for any safety problems you cause, or those which you should have noticed and failed to correct. So if you work on a TV and it burns down your friend's house in the middle of the night becauseof something you missed or that you caused, they can sue you, even years later. Treat the job as if it were going to be inspected afterwards and graded for neatness.
General repair sites
A basic knowledge of how a TV set works and what cango wrong can be of great value if you have a broken TV,even if you do not attempt the repair yourself. It will enable you to intelligently deal with the service technician. TVs can be dangerous.Inside TV there are power circuits that can take their toll on circuit components when something goes wrong. Many TVs in use today are still "Hot Chassis", one side of the AC line is connected to the circuit common. Be prepared for this. Most problems occur in the horizontal deflection and power supply sections.These run at relatively high power levels and some components run hot.The high voltage section is prone to breakdown and arcing as a resultof hairline cracks, humidity, dirt, etc.Also bad solder connections are recommon around tuner and shieldingsections even in new sets.Repairs to TVs and monitors should only be attempted by persons who are fully aware of working safely with high voltages. Monitors and TVs can produce very high, lethal voltages up to 33,000 volts. There are mains voltages inside the cabinet and usually also around 130V DC on the chassis also. If you do go inside, beware: line voltage (on large caps) and high voltage(on CRT) for long after the plug is pulled. There is the added danger ofCRT implosion for carelessly dropped tools and often sharp sheetmetalshields which can injure if you should have a reflex reaction upon touchingsomething you should not touch. In inside of a TV or monitor is no placefor the careless or naive. Monitors designed for PCs, workstations, and studio video have manycharacteristics in common. Modern computer monitors share manysimilarities with TVs but the auto-scan and high scan rate deflectioncircuitry and more sophisticated power supplies complicates their servicing.
The video cassette recorder is a wonderful example of extremely complexprecision technology that has been made affordable through mass production.In general, it is usually quite reliable. Treat a modern VCR with a bitof respect and it will provide trouble free service for a long time.The electronics in VCR are generally quite reliable and rarely fail. MostVCR problems are mechanical - dirt and dust in the tape path, deterioratedrubber parts, dried lubrication, wear of precision parts including thespinning video heads, and abuse. Many of those problems can berepaired quite easily if you know what you do. While VCRs with new convenience features are constantly introduced, thebasic function of playing a tape has not changed significantly in 25 years.The older VCRs are built much more solidly than the $100 models of today.Even high-end VCRs may be built around a poorly designed transportand flimsy chassis. However, there are still millions of middle age to older VCRs out there whose life could be greatly extended with a little tender loving care.
Audio devices are not generally considered as anyway very dangerous devices to repair, but there are still dangers to worry about.Devices that plug into the wall can produce a very lethal electric shock as well cause a fire from incorrect or careless repairs both during servicing or later on.
CD palyers are complicated devices which include lots of sophisticatedelectronics and mechnics. There are may things which can go wrong there.Many common problems with CD players can be corrected without the need for the service manual or the use of sophisticated test equipment.You can often repair a CD player which is faulty due mechanical problem or wring electrical adjustment.While CD players with new convenience features are constantly introduced, the basic function of playing a CD has not changed significantly in 15 years. Working on optical storage equipment entails a number of personal risks: electrical, laser, mechanical, as well as the possibility of irreversible damage to the equipment and loss or corruption of data due to improper repair or adjustment.
Remote controllers are quite ideal repair projects. They get damaged quite often because they must take heavy use (gets dropped to the floor quite too often).There isn't anything dangerous inside a typical infrared remote hand unit. Even staring point blank into the IR emitter isn't likely to harm anything. Usually the worst that will happen if you make a mistake is that the circuit will be damaged beyond beyond repair and a new remote control will be in your.Be warned that improper repair of battery operated devices can in bad cases result in bad consequences for you and the device.
Small household appliances
Telephones and telecommunication equipment
Other repair projects
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