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Old 22nd November 2011, 03:58 AM   #1
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Default JL Slash 500 v1 Help

Hey everybody I'm new on this forum and I would really appreciate some help. I have a slash 500.1 V1 amp and an alpine 10 in type r 1043d. I've never fixed an amp before but I have fixed an Hdtv (all new capacitors) and I'm willing to learn whatever I need to get this done.

Here's what happened;
The amp began cutting out awhile after I mounted it on the back of the sub box
I took the amp back off and put it back on the floor which seemed to help
The other day after 3 days back on the floor amp started smoking, the sub cut out so i pulled the fuse and took out the amp

What I've done so far
Took amp covers off and to the naked eye nothing is black or looks blown
There are two red coated wired things and they seem to smell the most of smoke
The amp power light turns on green, but no power comes through the output (I checked with multimeter)

I can upload pictures or even a video if it would help anyone help me
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Old 22nd November 2011, 04:11 AM   #2
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In the back right corner, there are transistors and resistors Q600-Q607 and R600-R607. Are the resistors burned?

Photos are good. I have no patience for video so don't upload it for me.
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Old 22nd November 2011, 04:54 PM   #3
Dr Zeus is offline Dr Zeus  United States
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If I am not mistaken, your red-coated-wired-things are the transformers? If they melted/shorted badly then you may need new ones, if they are even available. I can never seem to find them for any amp i fix, unless i have a good doner parts transformer.

In the last JL500 I fixed, the power supply was completely blown out; but funny thing was the amp would still light up green when power was connected. No output goes with this territory.
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Old 27th November 2011, 07:34 PM   #4
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Ok here are the pictures. Definitely burn marks against the metal heatsink thing.. I took a look at the jl slash v2 amp repair on this forum but I don't have color bands on the R600-R607 which make it more difficult... Could you guys like circle in red what I should repair on it and how i need to go about it, also where I could get the parts? Click the image to open in full size. Click the image to open in full size.
Oh and I do believe both the transistors and resistors are blown..

Last edited by 3025826; 27th November 2011 at 08:01 PM.
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Old 28th November 2011, 03:36 AM   #5
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The images aren't loading.
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Old 29th November 2011, 03:27 AM   #6
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Click the image to open in full size.

Click the image to open in full size.

Here these should show
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Old 29th November 2011, 04:49 AM   #7
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Didn"t work heres the direct Links
DSCF0310 | Flickr - Photo Sharing!
DSCF0312 | Flickr - Photo Sharing!
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Old 29th November 2011, 06:53 AM   #8
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That's common when the power supply FETs (IRFZ44Ns here) fail. The gate resistors will also need to be replaced.

You need to check the output transistors to see if any have failed.
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Old 29th November 2011, 04:26 PM   #9
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Where you say the (IRFZ44Ns here) I assume there should be a link if you could post it. But could you please show me on a picture where all of those things are? I'm willling to do whatever I need to get this amp working it was the best sound quality I've found in an amp.

Also if anyone has links to where I could order the parts I need it would be appreciated
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Old 29th November 2011, 04:35 PM   #10
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No. I meant 'here' as 'in your amplifier'. The transistors are marked IRFZ44N. The gate resistors are the burned components connected to leg 1 of the Z44s. Their circuit board designation is R600-R607.

Before you can order parts, you need to check the output transistors.
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