Guide to Troubleshooting Consumer Electronics Audio Circuits

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Restore your ailing, damaged and dead audio products to their original, pristine performance with Guide to Troubleshooting Consumer Electronics Audio Circuits.

Guide to Troubleshooting Consumer Electronics Audio Circuits is a practical, hands-on guide that makes complicated audio circuitry repairs easy. Whether you are making a simple preamp circuit repair or an advanced semiconductor or tube audio output circuit repair, this guide will show you how. Detailed schematics, helpful hints, and actual case histories recounting test data and necessary component repairs are included to help you make repairs on all kinds of audio equipment, from cassette and CD players to home receivers and high-powered amplifiers.

Guide to Troubleshooting Consumer Electronics Audio Circuits has solutions for your audio electronics circuit problems. Inside, you will learn:

• How to take critical voltages

• How to use and locate defective audio components with the multitester

• How to identify weak, distorted, intermittent, and noisy circuits

• How to service simple and inexpensive consumer electronics audio circuits

• How to troubleshoot the special audio circuits of the erase head, tape head, phono, remote control, mute, speaker relay, and tube bias circuits And much more!!!


  1. Basic Audio Circuit Tests
  2. Important Audio Test Equipment
  3. Servicing the Low Voltage Power Supply
  4. Troubleshooting Preamp and AF (audio frequency) Circuits
  5. Repairing Power Output Circuits
  6. Troubleshooting Stereo Audio Circuits
  7. Repairing SMD Audio Circuits
  8. Servicing High-Powered Audio Circuits
  9. Troubleshooting Inexpensive Electronics Circuits
  10. Servicing Special Consumer Electronics Audio Circuits
  11. Troubleshooting Consumer Electronics Audio Circuits Without a Schematic
  12. Important Audio Tests and Adjustments
  13. Glossary


90% of all consumer electronic products contain circuitry that you can troubleshoot. The audio circuits might start with a simple preamp circuit and zoom up to the high-powered semiconductor or tube audio output circuits. Servicing the electronic audio circuits can be accomplished by anyone interested in consumer electronics. Troubleshooting the mono and stereo audio circuits are easy to repair and sometimes one can listen to the music while working on the audio chassis. Besides, troubleshooting audio circuits is a lot of fun.

The purpose of this guide is to show the various audio circuits found in the audio amplifier, cassette and tape player, TV/CD player, auto AM/FM/MPX receiver, home receiver, boom- box, auto CD player, telephone answering machines, and the high-powered amplifier.

This is a practical guide in troubleshooting consumer audio circuits. The guide is filled with hints, kinks, and practical audio data. Throughout the many sections there are actual case histories of the defective audio circuits, what tests were made, and how to replace the defective component. Locating the defective audio component takes up to 85 % of your service time, while removing and replacing the defective part requires the least amount of time in troubleshooting electronic circuit procedures.

The basic audio circuit tests are provided in detail within Section 1. Knowing how to take critical voltage, resistance, and semiconductor tests is required with the various test instruments. Learn how to locate the defective component when weak, distorted, and intermittent circuits are found in the basic circuits.

Knowing how to use and locate the defective audio component with the multi-tester, DMM, noise and tone generator, semiconductor tester, audio and function generator, and audio signal tracing test instruments is important also. The various load, test cassettes and tape head devices are found in Section 2. The most important list of test instruments are required for those technicians who want to become audio specialists within the audio consumer electronic field.

The most important circuits within the audio products are found in the low voltage power supply. Most technicians check the low voltage sources, first, in the audio circuits or chassis. Section 3 provides the many different power supply circuits found in the different electronic products in the consumer electronic field. The different service problems within the low voltage circuits are given in this section.

Troubleshooting the preamp, AF and power output circuits are found in Sections 4 and 5. The different preamp and AF circuits with the many service problems are found in Section 4. Section 5 describes the different audio output circuits, the weak, distorted, intermittent, and noisy circuits within the audio output circuits. The special high-wattage and tube amplifier circuits are provided in this section.

Section 6 illustrates the different service problems found in the stereo audio circuits. This section shows how to troubleshoot, locate, and service the right and left stereo circuits found in the cassette and CD players, auto stereo receivers, and auto high-powered amplifiers. It also describes how to replace power output transistors and IC components in the stereo audio circuits.

Steps in repairing the new surface-mounted devices (SMD) are given in Section 7. Learn how to locate and know how to identify the SMD part and replace the defective component in the mini-cassette, portable CD player, TV, and stereo amplifiers. The different SMD parts are now found in SMD construction projects.

Information on servicing the high-powered audio circuits can be found throughout Section 8. How to repair the tough dog chassis, high-powered circuits, four channel amps, bridged power output circuits and several different case histories are listed in this section.

Information on how to service the simple and inexpensive consumer audio electronic cir cutis can be found in Section 9. The early and simple radio circuits, transistor and IC radio, compact disc, and phonograph circuits are found in this section. Also listed here, are the boom-box, portable CD, auto cassette, and the various headphone circuits.

The special audio circuits of the erase head, tape head, phono, remote control, mute, speaker relay, and tube bias circuits, to name a few, are found in Section 10. Information on how to repair the auto cassette reverse, receiver mute, center power amp, ac-dc tube radio, tube amplifier, and Dolby circuits are also found in this section.

The audio technician services many different audio products without a schematic, each day of the week. Section 11 shows the many different service problems and symptoms with the various audio circuits and how to repair them. Information on how to handle the hot, weak, intermittent, dead, and noisy audio circuits without a schematic is provided. Servicing the remote control circuits can be done by almost anyone with only a few hand tools and test instruments.

Information on how to connect, use, and make different tests with different test instruments in troubleshooting audio circuits is found in Section 12. Issues that are addressed include: What do the various scope waveforms indicate, how test instruments are tied into the audio circuits, and the many adjustments required within the cassette player and amplifiers for best recording and playback modes.

Besides providing the different electronic audio circuits and test data, many photos and schematics are found throughout the guide. You will find many practical case histories in each section. The earlier and the latest audio circuits were taken from trusted sources. Now is the time to troubleshoot and repair that next audio circuit, found in the different audio electronic products. So let’s begin.

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Updated: Thursday, 2023-12-14 21:25 PST