Alpha 907KX 4V DC output problem

Where did you measure this 4V ?

If you have 4V measured at the speaker terminals firstly, you have a protection circuit issue because this should never happen. And secondly, a DC offset issue for the Right channel. They are quite complex and a bit scary, as they have an internally bridged design which adds an extra layer or two of complexity which may put off people used to other models of a more straightforward design.

There is a Service Manual (in Japanese) here https://www.hifiengine.com/manual_library/sansui/au-a907kx.shtml

But it really needs someone experienced to get it on the bench and find out what's wrong, I.O.W unlikely to be a simple issue.

I recommend you don't use it until this issue is resolved.
 
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