Posted by erden on September 18, 2003 at 15:18:58:
In Reply to: Sansui AU-X701 Amp. posted by Ian Brown on July 03, 2003 at 17:15:01:
For both of you with flashing protecttion circuits, try first to change the variable resistors for bias and DC offset. They can be find easy, the black ones are for bias (4 of them), 1 kOhms values and the blue ones (on the both corners of power amp PCB) 500 Ohms and 100 Ohms for DC offset. Changing them with new ones previously adjusted (using simple multimeter) to "half" position, usually solve the problem if everything other is OK. As for the values, the bias voltage should be set on the both amps (AU-X701 and 901) around 17mV+/-2mV and DC offset less than 3mV (the values are from the original service manual, which is the same for both model). It is very easy to do!
If you want more details about this topic and DIY, look at www.tnt-audio
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