Amp does not produce proper class D switching even without the outputs in.
Driver board has been worked before - so condition is unknown.
I took out the outputs out of the board , they read just fine on the tester.
I've got some weird reading measuring the buffers - q24, q25, q27,q28.
DMM in diode mode -readings are between 156 - 264 depending which one i'm measuring ...i suppose they are kind-a dead. This seems odd buffers to die, but the outputs to survive.
As I can't find 2sb1236a/2sd1857a can I use 2SB649A + 2SB649A ?! Specs seems compatible ?
Schematics attached.
Driver board has been worked before - so condition is unknown.
I took out the outputs out of the board , they read just fine on the tester.
I've got some weird reading measuring the buffers - q24, q25, q27,q28.
DMM in diode mode -readings are between 156 - 264 depending which one i'm measuring ...i suppose they are kind-a dead. This seems odd buffers to die, but the outputs to survive.
As I can't find 2sb1236a/2sd1857a can I use 2SB649A + 2SB649A ?! Specs seems compatible ?
Schematics attached.
They should work but you'll have to test carefully to confirm.
Yes. It's odd that they would fail if the output have not.
Yes. It's odd that they would fail if the output have not.
Something else I've noticed - C151 was really really bad bulged. I've changed this one to a 160v same capacitance.
There should not be more than +100v at +VD, should it ?
There should not be more than +100v at +VD, should it ?