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Yamaha TSR-7810 receiver FR out power drift

ponteley

New Member
Apparently same as RX-V681/RX-V781/RX-A760/RX-A860

Everything working fine when plugged in and turned on.
Output voltages on all speaker terminals are few mV.
As time goes by (10-20 minutes), FR chanel goes to 10mv>100mv>200mv>300mv and up to 3V and then PROTECTION kicks in.

Very strange issue. Can't find anything blown/overheating/shorted/open.
All diodes and transistors checking out OK. Resistors too.

Plus, I can't find service manual or schematic....

Any help is greatly appreciated.
 
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