Thanks..
Ive replaced the following :
R157
R515
R156
C501
All other resistors in that general area check fine..
The outputs were also missing out of this amp..
Besides checking the drivers for the outputs do i need to cheack anything else before installing the new outputs and powering it up ?
Ive replaced the following :
R157
R515
R156
C501
All other resistors in that general area check fine..
The outputs were also missing out of this amp..
Besides checking the drivers for the outputs do i need to cheack anything else before installing the new outputs and powering it up ?
Since it appears that someone else has attempted to repair it, I'd suggest checking the drive signal before installing the outputs.
To do this, you'll need to solder a jumper between pins 1 and 2 of the 8-pin op-amp next to U512. That should make the drive signal appear on the low side. To make the signal on the high side visible, you'll likely have to solder a jumper between legs 2 and 3 of Q505. Be sure that both jumpers are removed BEFORE installing the outputs.
To do this, you'll need to solder a jumper between pins 1 and 2 of the 8-pin op-amp next to U512. That should make the drive signal appear on the low side. To make the signal on the high side visible, you'll likely have to solder a jumper between legs 2 and 3 of Q505. Be sure that both jumpers are removed BEFORE installing the outputs.
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