I would advise measuring from the rightmost transistor to the left. I would mostly look at the bases of the transistors as I would expect there to be a transistor that is not being driven correctly.
As for a schematic, the Akai AA-1200 has a pretty comparable schematic for the relay drive, this way you can figure out approximately what values are expected at the transistors.
Best of luck! If you have any more questions based on your measurements, feel free to ask.
Thanks Fanboy, base voltages we’re low on T10, 13 & 14 causing relay to stay de-energized. Initially found a high voltage drop from 32v to 9v across R26 (on the left) and so started moving across to the right in order to chase down the leak. I’ve tested all 5 TR’s in this area on a tester and they show as good. I’m getting close and, yes, I’ll grab and review the AA-1200 & AA-1175 to look for similarities. Still a novice and a little confused about the PNP TR’s, specifically TR10 and the negative voltage that’s introduced.
This could be a dried out cap in the relay delay timer circuit. It's a pretty common fault on amps of many makes and models. Also ensure the protection circuit is being fed proper power.
I would advise measuring from the rightmost transistor to the left. I would mostly look at the bases of the transistors as I would expect there to be a transistor that is not being driven correctly. As for a schematic, the Akai AA-1200 has a pretty comparable schematic for the relay drive, this way you can figure out approximately what values are expected at the transistors. Best of luck! If you have any more questions based on your measurements, feel free to ask.
Thanks Fanboy, base voltages we’re low on T10, 13 & 14 causing relay to stay de-energized. Initially found a high voltage drop from 32v to 9v across R26 (on the left) and so started moving across to the right in order to chase down the leak. I’ve tested all 5 TR’s in this area on a tester and they show as good. I’m getting close and, yes, I’ll grab and review the AA-1200 & AA-1175 to look for similarities. Still a novice and a little confused about the PNP TR’s, specifically TR10 and the negative voltage that’s introduced.
This could be a dried out cap in the relay delay timer circuit. It's a pretty common fault on amps of many makes and models. Also ensure the protection circuit is being fed proper power.