jl audio 500/1 power supply wont turn on - Page 2 - diyAudio
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Old 16th March 2013, 01:51 AM   #11
ivkata is offline ivkata  United States
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so i removed all the psu fets and few where shorted even tho no visible damage ,after double checking for any solder bridges i tested each and all gate resistors read 47-48 ohms i so believe they are good to stay.two of the outputs are shorted as well q506 ,q507 as well as q509 q510 .I have to replace all the outputs right ,but where do i find them at resonable price
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Old 16th March 2013, 02:26 AM   #12
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All of these parts will be available from Digi-key or Mouser.

Replace all 4 outputs.

If Q509/10 failed, you need to check the resistors between the driver IC (TC4427) and Q509/10.

You also need to confirm that you have a good drive signal from the driver IC.
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Old 16th March 2013, 03:19 AM   #13
kds9591 is offline kds9591  United States
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Quote:
Originally Posted by ivkata View Post
so i removed all the psu fets and few where shorted even tho no visible damage ,after double checking for any solder bridges i tested each and all gate resistors read 47-48 ohms i so believe they are good to stay.two of the outputs are shorted as well q506 ,q507 as well as q509 q510 .I have to replace all the outputs right ,but where do i find them at resonable price
avnetexpress.avnet.com/ Sells the IRFZ44NPBF for $.36 each and the IRF540NPBF for $.39 each.
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Old 16th March 2013, 03:26 AM   #14
ivkata is offline ivkata  United States
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i tought the irf540n will not work in the jl amps or they are not reliable with them
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Old 16th March 2013, 04:33 AM   #15
kds9591 is offline kds9591  United States
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Originally Posted by ivkata View Post
i tought the irf540n will not work in the jl amps or they are not reliable with them
Maybe with other car amp brands but not the JL Audio slash series amps.
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Old 16th March 2013, 06:01 AM   #16
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Rockford has a problem with the IRF540N.
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Old 16th March 2013, 12:30 PM   #17
ivkata is offline ivkata  United States
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ok ill order them then as i have another 4 of those amps somewhere here with various issues .is there a way to test the driver IC without a scope as i dont own one
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Old 16th March 2013, 10:04 PM   #18
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With the output transistors out of the amp, connect a jumper from leg 2 to leg 3 for Q505 and Q506.

With the black probe on leg 3 and the red probe on leg 1, what is the DC voltage for all 4 output FETs?

If you have defective driver transistors, you'll have to replace them before you can check the drive signal for the output transistor being driven by those drivers.
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Old 17th March 2013, 09:16 AM   #19
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I have nothing but trouble using the 'N' series in all the slash D amps i've done as well. I always use a Harris 540, or a Fairchild 540a. Every 'N' I tried to use in any of those amps **** the bed inexplicably and out of nowhere before it even left the bench. The aformentioned were dropped in and away it went happily. Rumor has/had it the 'Z' series works, but I had bad luck with those too. The original parts i've seen are base level 540's, no suffix.

If the N's are working for people, awesome. But I wouldn't feel right if I didn't throw my experiences with them in the ring. They were IR parts BTW, matched and over the course of several of these amplifiers and more than one batch. Who's part is everyone having the best luck with in these?

Last edited by MatthewS; 17th March 2013 at 09:30 AM.
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Old 17th March 2013, 02:13 PM   #20
kds9591 is offline kds9591  United States
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Originally Posted by MatthewS View Post
I have nothing but trouble using the 'N' series in all the slash D amps i've done as well. I always use a Harris 540, or a Fairchild 540a. Every 'N' I tried to use in any of those amps **** the bed inexplicably and out of nowhere before it even left the bench. The aformentioned were dropped in and away it went happily. Rumor has/had it the 'Z' series works, but I had bad luck with those too. The original parts i've seen are base level 540's, no suffix.

If the N's are working for people, awesome. But I wouldn't feel right if I didn't throw my experiences with them in the ring. They were IR parts BTW, matched and over the course of several of these amplifiers and more than one batch. Who's part is everyone having the best luck with in these?
I believe the first JL Audio 500/1 I used the IRF540N in was around 2005 and while I have used the IRF540's as well I found that the IRF540N's were more consistently available from several sources and cost slightly less so I always had them on hand. Perry mentioned IRF540N's don't work in Rockford amps and I vaguely remember repairing a Rockford amp a few years back trying to use the IRF540N's and had trouble with them and switched them out with IRF540's.

With the JL Audio 500/1 amps I always replaced all 4 outputs with the IRF540n's with the same lot number even if 2 of them tested good. I usually use up all MOSFETS with the same lot number before using ones with a new lot number but over time you still get a collection of same number MOSFETS with different lot numbers. With those I use my transistor/MOSFET tester to match the Hfe (gain) and write the gain # on the back of the tab with a fine point Sharpie. I repaired a JL Audio 500/1 for a friend a couple of years ago and replaced the 4 outputs using IRF540N's from 2 different lot #s but gain matched and after 2 years there have been no issues with the amp.

Whether or not a IRF540N works or not depends on how critical the design of the circuit its used in. Better designs are less critical and have a wider tolerance. There are a few differences between the spec sheets of the IRF540 and IRF540N but nothing substantial so in most circuits they should be interchangeable. But as in most things YMMV.
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