JL Audio 500/1

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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 ?
 
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.
 
You should see something like the attached image.
 

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