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Old 14th March 2013, 12:47 PM   #1
ivkata is offline ivkata  United States
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Default jl audio 500/1 power supply wont turn on

i purchased this amp and another or ebay as broken for parts /repair and for my surprise the other unit worked just fine .This Jl 500/1 dosent look like it was ever repaired in the past ,nor anything looks burn here is my test results :


-when i connect it to my psu the green light comes on ,amp draws 3a current right away ,no power suppy start pulse to be seen .Eventually the power light does away in about 1 min ,current thru the amp is still 3 amp.If i swich the singnal sensing button to on the power light comes back on ,draws a little more current .

There is no dc on the speaker terminals ,no audio output neither .moving switches or pots dosent efect the unit

board: rev 10
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Old 14th March 2013, 01:52 PM   #2
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I don'y know about this amp specifically, but may happen that this set need a separate enable input?
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Old 14th March 2013, 04:44 PM   #3
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Have you looked closely at the legs of all the transistors that are mounted to the heat sink? The rectifiers legs usually break...but check all of them very closely, heck use a 5x magnifier.
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Old 14th March 2013, 11:09 PM   #4
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Post the DC voltage on the 10 pin connector after the power LED goes out. Use the pin numbering shown on the attached photo.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Attached Images
File Type: jpg jlaudio500slashone10pinconnector01.jpg (470.2 KB, 93 views)
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Old 15th March 2013, 01:43 AM   #5
ivkata is offline ivkata  United States
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Pin 1: 4.6
Pin 2: -14.3
Pin 3: 12.9
Pin 4: 5.3
Pin 5: 12.3
Pin 6: 12.4
Pin 7: 0.7
Pin 8: 12.2
Pin 9: 12.2
Pin 10: 0 .0
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Old 15th March 2013, 02:03 AM   #6
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Except for pin 1, which is a bit low, those look OK.

Do any of the gate resistors for the power supply look burned? They Are R600-R607.
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Old 15th March 2013, 03:48 AM   #7
kds9591 is offline kds9591  United States
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Normal idle current for this amp is 1.5A-1.7A but will draw as much as 3.5A before it settles down to 1.5-1.7A.

If you have the rear heatsink off check output MOSFETS Q504-Q507 IRF540's to see if any of them get warm or hot with no signal and no load. If any do check to see if shorted or leaky. If ok check Q500-Q503 and Q508-Q511. Now if you do have a problem with the output MOSFETS or the output circuit your power supply MOSFETS will get warm or hot but that does not always mean they are shorted or leaky as well.

Do you have a O'scope?

Last edited by kds9591; 15th March 2013 at 03:52 AM.
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Old 15th March 2013, 04:08 AM   #8
ivkata is offline ivkata  United States
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it appears that all the psu transistors failed even tho there was no residue or burned resistors to be seen .I dont have irfz44n now i do have irf3205 can i use them without replacing the gate resistors as they all appear in tolerance
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Old 15th March 2013, 04:27 AM   #9
kds9591 is offline kds9591  United States
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I'd stay with the original IRFZ44's. Also check your output MOSFET's and Q500-Q503 and Q508-Q511 because if shorted or leaky they will be the root cause of the power supply MOSFET's failing in most cases.
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Old 16th March 2013, 12:01 AM   #10
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The original Z44s are good enough. I've been using IRF3205s in the most of the JL 500s that I've seen lately (I've done about 10-12 so far) and they appear to be OK. I haven't done enough or checked enough after long-term use to say that the drivers will hold up. Their current rating is high enough but they may run hot.

Are you sure that the FETs failed with absolutely no visible damage to any of the power supply gate resistors?

After removing the FETs and cleaning up the solder pads (to ensure that there are no solder bridges), check every gate resistor to confirm that all are within tolerance.
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