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Old 3rd January 2012, 02:23 PM   #1
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Default JL 500/1 Low output.

Powers on no problem with no thermal or low ohm lights. Sound stays constant with gains at full, but as stated, very low output. Every 2-3 min it puts a momentary burst of power out but its a split second so unsure if its just a surge or if it is actual sound going through to sub. Three out of four caps looked and felt raised so pulled the cap off one to see if it was leaking. I know the covers always look pushed out, but you can feel it. Pic doesn't do much justice for it.

Click the image to open in full size.

Would like suggestions, also, I've bought some caps for my LCD from digikey. Good site to purchase from?
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Old 3rd January 2012, 03:54 PM   #2
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Digi-key is a good distributor.

The cap is likely OK.

Do you have a scope?

Have you tried operating all of the controls through their entire range with a speaker and signal source connected to see if it would ever produce clean audio?

What are you using for a signal source?
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Old 3rd January 2012, 04:41 PM   #3
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useing my car which I run my jl 300/2 from with no problems. Headunit is a pioneer avh-4000dvd. Also bench tested it with an ipod running a 3.5mm jack to rca converter wire with a 120vac to 14vdc converter box, still same either way, so I eliminated any of the electrical is my car as the problem. I have played with every gain, filter, and everything in between on the amp. Only thing I haven't done was hook up a bass knob because I do not have one. All I have for testing is a multimeter and a test light, lol.
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Old 3rd January 2012, 05:10 PM   #4
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What revision is the main board?
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Old 3rd January 2012, 05:13 PM   #5
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Ill look at it when i get off work, work nights so it will be around 2am before I can look. Also, where do I find that info? Still learning as I go, lol.
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Old 3rd January 2012, 05:43 PM   #6
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I don't what information you're referring to but the 4 links in the sig line below would be a good start.
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Old 3rd January 2012, 05:49 PM   #7
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The info I am referring to is where I find what revision the board is. Lol, didn't know those where links.
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Old 3rd January 2012, 06:10 PM   #8
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The revision number is silkscreened on the board in white.
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Old 5th January 2012, 04:44 AM   #9
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Sorry, work nights and been busy before work, bought an mtx 1501d amp from a pawnshop and its no good, so need to talk to them tomorrow morning. I will look at it tomorrow and get you the revision number after I go there. Going to try and get the mtx for as cheap as i can as a blown amp so that will be the next amp I will post on here if I can get it.
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Old 5th January 2012, 12:46 PM   #10
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The MTX amplifiers can be VERY difficult to repair. I think a couple of MTX amps repairs took 150+ posts to get them working. Unless you know precisely what's wrong with it or you can easily afford to lose the cost of the amp, I'd suggest getting your money back.
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