PPI PC4800

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I dont know what im thinking today. I swapped driverboards around and now im thinking that i still have problems with the same channel as i did from the begining.

The problem has always been with the front left channel ot the right channel.

I removed outputs and tested all of them they test fine.

So now im going to solder thoose back in. Next i will check the A1011 and C2344 to make sure thoose are good.

Then what should i check next?

For right now i will say the driverboard is still good.
 
Each channel probably has 2 muting transistors but they're before pin 3 on the driver board. If the signal is clean on pin 3, the muting circuit isn't the problem.

When you checked the small driver transistors (I'm assuming you followed the traces from 12/13 to the drivers), did you confirm that you read 0.6v from 1-2 and 2-3 for the driver transistors?

Did you check for leakage?
 
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