How to Repair a Weak Signal on a Stereo Amplifier
Repairing a stereo amplifier that has a weak signal because of serious internal problems may be beyond the capabilities of most average consumers, and in general, major repairs should be left to a professional technician that specializes in the type of equipment you are using. However, there are some small repairs that are within the reach of most users with only a very basic knowledge of how audio equipment works. Does this Spark an idea?
Things You'll Need
- Multipurpose cable tester
- Replacement audio cabling
- Multimeter
- Replacement power cable
- Replacement fuse
Instructions
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Remove the audio cabling to disconnect your source components from your amplifier. Test the audio cables for a full signal with a multipurpose cable tester. Cable testers can be purchased through electronic supply shops and many stores that sell musical equipment and recording supplies. Check your manual if you are unsure how to perform a test on a particular type of audio cable. Replace any faulty cabling with a working cable.
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Unplug the stereo amplifier's power cable from the wall socket or surge protector. If the power cable can be removed from the back of the stereo amplifier, remove the power cable.
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Test your power cable for continuity with a multimeter. Multimeters are widely available at hardware and pro audio supply shops as well as through many online retailers. All multimeters are different, so make sure you read instructions on how to use your multimeter to get an accurate reading for a power cable. Replace a faulty cable with a new cable of the same type.
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Check the main power fuse in the back of the amplifier for cracks in the filament or burnt areas. Even a small crack in the filament can cause a weak signal or intermittent power, as can a partially or fully blown fuse. Replace a faulty fuse with the exact same type of fuse.
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Tips & Warnings
Make sure that repairing your stereo amplifier at home will not void your manufacturer's warranty. In the case of many new amplifiers, opening the device can immediately void your warranty. If you are unsure about your amplifiers warranty status, check with the manufacturer before making any repairs.
If you have to replace a power cable, make sure it is the exact same type. If you are unsure, take the cable to a supplier or electronics supply store where they can properly identify the cable for you and pick a replacement.
Always use the same type of fuse when replacing main power fuses. Using a fuse with different voltage can cause internal damage and operational problems.
References
Resources
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