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Yamaha M-4 DC Offset

avionic said:
M-4 Adjustment procedure (illustrated)

The DC balance is the Offset.The service manual is a little misleading as to where to connect the Volt meter.Your offset is a little high.I'd try to get them below +/- 10mv. I attached the DMM probes to the speaker outputs and adjusted the DC balance pot for minumum offset. Step 1 PS adj.,Step 2 Bias/idle adj. Step 3 offset/balance adj. :scratch2:

Correction of misprint in the service manual.....

Step # 3 DC offset/balance - probe test points should be CT and E on the Drive PC board or you can use the speaker output jacks as long as the protect relays are working. If the relays are not working then you must use the testpoints.

I photoshopped the procedure to reflect the corrected ( offset ) test points...
Click to expand...
This just helped me too. Thank you. I was about to rip my hair out trying to figure that out.
 
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