How to Repair a Yamaha Ampby Keith Patrick
Yamaha power amplifiers are used in professional audio environments around the world. Power amplifiers act as a medium between electrical outlets and PA speakers or mixers. You can repair a Yamaha amp by first troubleshooting the problem area in the device and then fixing that area. Many problems with Yamaha amps stem from overheating, frayed wiring or loose electrical transistors.
Power off the amplifier and allow it to cool down. Many Yamaha amplifier problems stem from overheating. Press the "Power" button on the right side of the amp to shut off the device. Let the amp cool off for 20 minutes before turning it on and using it again.
Test the power source to the amplifier. Many amplifier problems come from the power and not the actual device. Press the "Power" button once to shut off the amplifier. Unplug the amp's electrical cord and plug a new electronic device into the outlet. If the electronic device works properly, you can rule out the power from the outlet causing the amplifier problems.
Examine the amplifier's internal wiring. Unscrew the four screws holding the amp's back cover in place using a 1/8-inch screwdriver. Pull off the back cover and put it to the side with the screws. Shine a flashlight inside the amplifier and look for signs of damage. Loose wiring or frayed wiring could be causing a problem. If you see wire that looks damaged, you must either resolder it yourself or send the amplifier out for repairs.
Inspect the circuit board. Hold a flashlight with one hand and point it at the circuit board. Look for loose transistors or capacitors sitting on top of the board. Transistors and capacitors look like small black cubes. Even one loose capacitor can stop the electrical circuit and shut off down the amplifier. You will need to replace any damaged circuit board parts through Yamaha.