Troubleshooting & Repairing Consumer Electronics Without a by Homer L. Davidson
By Homer L. Davidson
During this up to date version of his best-selling consultant, Homer Davidson, grasp of patron electronics, presents wizardly hands-on suggestion on troubleshooting and repairing a variety of digital units -- with no the advantage of schematic diagrams. * Covers automobile stereos, cassette avid gamers, stereo audio circuits, radios, VCRs, TVs, speaker structures, CD-players, and extra * NEW insurance of DVD gamers and handheld remote control devices * greater than four hundred targeted drawings and photographs to demonstrate the most productive strategy to find, try, and service faulty parts content material Servicing tools and not using a Schematic the best way to find, try out, and service Troubleshooting and Repairing Audio Amps, huge and Small Servicing automobile Receivers Servicing Cassette avid gamers Troubleshooting CD gamers Troubleshooting the television Chassis Servicing strength offers Servicing Stereo Sound Circuits Troubleshooting AM/FM/MPX phases VCR and TV/VCR mixture upkeep Repairing handheld remote control devices DVD participant maintenance
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Extra info for Troubleshooting & Repairing Consumer Electronics Without a Schematic
Sample text
9. 10. 11. 12. 35 The dual-trace scope is ideal when servicing CD players. Frequency counter Dc power supply Oscilloscope Isolation transformer Alignment table Blank tape Special manufacturers’ jigs Soldering station ESR meter (Fig. 2-5) Who’s on first? What is the first thing you should do? What is the symptom? You must know how the unit is acting up before troubleshooting the chassis. For instance, a dead TV might be caused by an open fuse, the low-voltage power supply, or the horizontal output circuits.
In the following pages I hope to reduce the time it takes you to troubleshoot and repair consumer electronic products without a schematic. Test points You will find many different tests points within a TV, CD player, or VCR player to take signal, waveform, and voltage measurements. If you can find the various test points in a given section, the circuits can be monitored for easy servicing. The test points might only consist of a lug, spot, or raised area that any test instrument can be connected to.
Notice that the ac input degaussing circuit, silicon diodes, and main filter capacitor are in the hot ground circuits. When taking ac or dc voltage measurements in these circuits, make sure that the black voltage probe is on the hot ground side of the filter capacitor. To determine if the low-voltage circuits are functioning, take a dc voltage measurement across the main filter capacitor (Fig. 2-13). Do not take the voltage from the common chassis ground because it will not be correct. TV SMPS hot grounds Within the switching power supply or switch-mode power supply (SMPS), all components on the primary side are connected to the hot ground.