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Amplifiers are assembled with many of the same components as other
appliances, so fixing basic elements is similar. For example, cords may
not consistently deliver electricity, switches and controllers can cause
problems, and fuses may need to be replaced. Frequently, however, what
the amplifier needs most is simply a thorough cleaning with some canned
air and/or contact cleaner.
The first step in fixing internal parts in your amplifier is to open
the unit up. Most amplifiers are encased in a two-piece
housing--top-front and bottom-back.
Besides fuses accessed from the back of the cabinet, many amplifiers include one or more internal fuses.
Disassemble an amplifier:
- Make sure that the electrical cord is unplugged from the wall receptacle.
- Remove screws on the side, back, or bottom to separate the cover from the chassis.
- Slide the two halves apart to expose the internal components mounted on the chassis (lower frame).
- Inspect the internal end of the electrical cord for looseness or damage caused by being pulled (a common problem) and replace as needed.
- If there is no power, but the cord works, look for an internal fuse. Test the fuse and replace as needed.
- Use a can of compressed air to carefully blow away dust that is
attracted to electronic components. If excessive, use a vacuum cleaner
with a plastic tip (so delicate parts won't receive static electricity)
to clean the inside of the unit.
- Use electrical contact cleaner to clean the input jacks and speaker
terminals. If one of the input jacks is disconnected from the wires,
either reconnect or resolder it.