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Reply with quote  #1 

I just receive my AU4400 from the repair shop. He fixed my transistor firing problem.

Unfortunately he did not have the service manual and could not set the bias for my AU4400 after the repair.

I suspect it is the trimpot on the mainboard and one of the two micron resistors but no details of the values to adjust the trimpot to.

Can anyone assist with the details?

Thank you in-advance to any help in the matter!

Reply with quote  #2 
Discovered one channel had setting of approximately 49mV while the other was about 15mV.

Reset both to about 15mV and been working fine after replacing all the electrolytics except the large 2200uF 50V capacitor on the main amplifier board.

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