I've got a Sony GX10es on the bench and one of the secondary windings has gone dead. But it is one of the smaller supplies so I'm confident I can do a workaround. (Pretty rare failure in my experience but that seems to be it, coil measures open on my meter)
I could find another transformer with the right ratio and add it in, or install a couple voltage regulators and run them off the main rails. I'm thinking the second approach would be better.
I've attached a schematic with relevant parts highlighted.
Missing DC voltages are 21.7V. An AC voltage is missing as well, for the ac off detection. I brought sound back by pulling the rectifier and hooking up a couple DC bench supplies. Had to jump the back of D801 to the winding for the AC detection, the dead winding still seemed to pass enough voltage to make it work but I could adapt the circuit to run it off the main windings.
I feel like I have this under control, but was wondering what people here think.
Something like this for the regulators? 20V should be close enough? MC78M20CTG
Just need a negative one too.
I could find another transformer with the right ratio and add it in, or install a couple voltage regulators and run them off the main rails. I'm thinking the second approach would be better.
I've attached a schematic with relevant parts highlighted.
Missing DC voltages are 21.7V. An AC voltage is missing as well, for the ac off detection. I brought sound back by pulling the rectifier and hooking up a couple DC bench supplies. Had to jump the back of D801 to the winding for the AC detection, the dead winding still seemed to pass enough voltage to make it work but I could adapt the circuit to run it off the main windings.
I feel like I have this under control, but was wondering what people here think.
Something like this for the regulators? 20V should be close enough? MC78M20CTG
Just need a negative one too.
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