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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