JL Audio 500/1

mike49504 · 15th November 2011, 02:03 PM

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

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 ?

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?

15th November 2011, 02:03 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	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

15th November 2011, 07:35 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Which rev? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

16th November 2011, 01:24 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure it's R157? There's an R517. It's 10 ohms. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st November 2011, 08:42 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st November 2011, 09:18 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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16th November 2011, 01:04 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	REV 11

16th November 2011, 06:14 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	sorry my mistake it is R517

21st November 2011, 08:27 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	DO you happen to know the value of C501 Its also missing

21st November 2011, 08:47 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	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 ?

21st November 2011, 09:44 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	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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