Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Sony MHC 901av phones output but no speakers

That is 3 pairs of speaker outputs, CD,tuner and tapes ok. Left unused for a
few years.
Will check for amp noise on the speaker outlets in the next hour. At the
moment I'm thinking muting via corroded erroneous phones bypass switch ,
impossible to see /probe without taking all apart. Any other ideas to look
at. Looks like 2 stereo SIP hybrid amp packages, unlikely both failed, no
approprieate fuses seen yet.


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Default Sony MHC 901av phones output but no speakers

Now found a pair of relays that had no sound of click-over, but monitorable
for signal and control, assuming a minimum number of board interconnects is
enough to test out. Managed to get to the phones socket and the isolated C/O
sw is fine (or I disturbed it), but at least I now know which lines from
there go to the relay board and the output lines from the 2x STK4142II .


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