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mike49504 15th November 2011 02:03 PM

JL Audio 500/1
Got another 1 of theese in for repair..

Dose anyone know the value of R157 ?

Its located by all the caps in the output section

Perry Babin 15th November 2011 07:35 PM

Which rev?

mike49504 16th November 2011 01:04 AM

REV 11

Perry Babin 16th November 2011 01:24 AM

Are you sure it's R157?

There's an R517. It's 10 ohms.

mike49504 16th November 2011 06:14 PM

sorry my mistake it is R517

mike49504 21st November 2011 08:27 PM

DO you happen to know the value of C501 Its also missing

Perry Babin 21st November 2011 08:42 PM

Probably a 220uF@63. That's what the rev3 has. It's the same as the group of 7 on the other side of the rail cap.

mike49504 21st November 2011 08:47 PM


Ive replaced the following :


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 ?

Perry Babin 21st November 2011 09:18 PM

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.

mike49504 21st November 2011 09:44 PM

What would i set the scope to to check the drive signal ?

And do i touch the pad for the gate leg of the outputs?

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