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Old 12th January 2013, 07:28 PM   #1
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Question Jl Audio 500/5 won't turn on at all.

I bought this amp for repair, fairly cheap. I opened it up and notice it was repaired at one point (a few fets where replaced, 2 in the power supply and a few on the outputs). I looked around at the board to see if i find any visual damage, which i didn't. I did notice that two of the audio boards (vertically mounted, not sure if their referred as pre amp boards....but their the ones with the three leds) where replaced because they don't match....they're from another amp/revision.


So i powered it up with no loads or signal.....and nothing (no green our faulty leds, no rail voltage) i do have the 13.5vdc on the primary windings of the transformers.

So i took it apart and checked the fets (which they seem good...no shorts). But then i saw that rectifier D801 (sf1604ga) & D800 (sf1604g) had the center leg/pin broken. Looks like high voltage or current broke it but not sure.


I can replace all the rectifiers with mur1620ct/r but before i do that should i be testing any other things?


Should i replace all the output and power supply fets? I all because in the power supply only two where replaced, same goes for the outputs (they don't match).


Thanks in advanced.

Last edited by jeanious2011; 12th January 2013 at 08:06 PM.
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Old 12th January 2013, 07:46 PM   #2
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Here are pics of the fets, and a list if the fets on the amp. I don't have schematics so not sure if they are the correct components.

I'm hoping the rectifiers are in the correct location. Some one please verify this please.

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And here is the list of fets and rectifiers on the board.
Click the image to open in full size.
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Old 13th January 2013, 03:59 AM   #3
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I tested the two rectifiers that had the center leg broken and they seem okay. The others ate in circuit so can't really check them.

Should i solder the leg and power it up? What could of caused this to occur?
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Old 13th January 2013, 04:14 AM   #4
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Broken rectifiers are common in a lot of the JL amps.

You can power the amp up with the legs soldered.
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Old 13th January 2013, 03:45 PM   #5
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Thanks Perry, i wanted to ask first before i did it and cause further damage. I'll do it and hopefully that was the only problem.
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Old 13th January 2013, 05:38 PM   #6
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Okay i put it back together, powered it up and at first sounded horrible (i was testing the sub channel only). The subsonic filter was on, but when i switched it off it played fine and sounded good, had good wave forms on the scope.


Now, what could caused the subsonic filter to act up? I cleaned all the switches and pots with deoxIT . It's not a big deal if the source has subsonic filter, but i would like to fix it rather than leaving it like that and not being able to use it. Ask other channels are producing clean wave forms.

Any help is appreciated.


I'm going to order the recruiters i mentioned in post one, right Noe i just added solder to the broken legs and i don't trust it at all.
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Old 14th January 2013, 03:19 AM   #7
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Do you have clean audio on U524 pin 7, and U510 pins 1 and 7?
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Old 14th January 2013, 04:13 PM   #8
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Is u510 under the daughter board? I couldn't see it, i have the amp assembled.


I did see u524 and it had clean signal on pin 7 with subsonic filter switch on and off.
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Old 15th January 2013, 12:32 AM   #9
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Check pins 11 and 14 on U515. They are connected to those op-amps.
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Old 15th January 2013, 05:03 PM   #10
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U515
Pin 11= has bad signal with the subsonic filter on or/and off.

Pin 14= has clean amplified signal.



When i had the subsonic filter on and i touched pin 11 i got some sound but quickly distorted and pretty much stated acting up again.
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