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Old 15th November 2011, 02:03 PM   #1
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Default 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
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Old 15th November 2011, 07:35 PM   #2
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Which rev?
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Old 16th November 2011, 01:04 AM   #3
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REV 11
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Old 16th November 2011, 01:24 AM   #4
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Are you sure it's R157?

There's an R517. It's 10 ohms.
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Old 16th November 2011, 06:14 PM   #5
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sorry my mistake it is R517
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Old 21st November 2011, 08:27 PM   #6
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DO you happen to know the value of C501 Its also missing
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Old 21st November 2011, 08:42 PM   #7
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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.
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Old 21st November 2011, 08:47 PM   #8
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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 ?
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Old 21st November 2011, 09:18 PM   #9
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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.
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Old 21st November 2011, 09:44 PM   #10
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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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