Sansui A 910 Integrated Amplifier (stuck in PROTECTION mode)

Stuck in protection mode. (The speaker relay does NOT click on) I checked voltages at the output transistors. The right side voltages looked good, but the left side voltages were bad ( that's why the relay doesn't click on)

I found a bad 45580 op-amp chips (seen in picture above)  location on the board (IC2) Replaced Chip and unit is working great now. Very nice sounding amplifier!

Pioneer QX 8000A QUADROPHONIC Receiver (no sound from Channel 2 & 3)

This is a four channel receiver, it had a problem with channels 2 & 3. Their was no sound output from either of these channel. The problem was on the control Amp Board. Capacitors C2 & C3 were found to be bad. Rate 0.47uf @ 25 volt.

Here's a Diagram of the bad capacitors

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Technics SU V98 Integrated Amplifier. (Volume Problem)

This unit came to me with a volume problem. When powered on, it goes though it's checks and the speaker relay clicks on. I connected a CD player and speakers to it. volume was about 30 percent, no matter how high you turned up the volume knob.

I found a defective TC9212P ELECTRONIC VOLUME CONTROL IC. after replacing it, I was able to turn the volume all the way down and all the way up with no problem. I hope this repair can help someone in the future.