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JL 500/1
JL 500/1
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Old 6th August 2014, 10:55 PM   #1
Triviumfan4 is offline Triviumfan4  United States
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Default JL 500/1

Do these amps generally DC voltage across speaker terminals(25vdc).?
I'm also sure there's an issue because I have a square wave at speaker terminals as well.
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Old 6th August 2014, 11:09 PM   #2
Triviumfan4 is offline Triviumfan4  United States
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I'm assuming not,have some shorted MOSFETs and a handful of cracked resistors so far...
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Old 7th August 2014, 12:25 AM   #3
Perry Babin is offline Perry Babin  United States
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The DC voltage between the positive and negative speaker terminals should be less than 1v. The DC voltage from any speaker terminal and the main ground will be approximately 40v.
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Old 7th August 2014, 12:29 AM   #4
Triviumfan4 is offline Triviumfan4  United States
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Thanks for the reply.This is the first time on a jl class d.Changing drivers right now.I'm hoping it was just the FETs,drivers and a couple resistors.Might have to fire up your DVD on this subject lol.
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Old 7th August 2014, 12:44 AM   #5
Triviumfan4 is offline Triviumfan4  United States
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What's your thoughts on even a temp replacement of the 2n3906 drivers?All I have that's the same pinout is mpsa56...I have several others but not sure what would work even if I flipped the legs.A1266,a1023,a1015 and so on.
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Old 7th August 2014, 01:43 AM   #6
Perry Babin is offline Perry Babin  United States
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Try the MPSA56s.
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Old 7th August 2014, 01:46 AM   #7
Triviumfan4 is offline Triviumfan4  United States
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I was thinking that was my best bet.Ill test it soon and well find out.Also I'm going to try it with 540N's.I've seen opinions back and forth.Guess well find out.
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Old 7th August 2014, 01:49 AM   #8
Perry Babin is offline Perry Babin  United States
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I'd recommend the IRF3710Z as outputs if you have them.

For all JL500s, I've been using the 3205s in the supply and IRF3710Zs for the outputs.
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Old 7th August 2014, 01:52 AM   #9
Triviumfan4 is offline Triviumfan4  United States
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Trust me I've read your posts.I would use the 3710Z if I had them.I will order some so I have them.At this point I'm just trying to get it working to confirm I found all defective parts.
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Old 7th August 2014, 01:58 AM   #10
Perry Babin is offline Perry Babin  United States
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The 540s are OK but if you have the 3710Z, use them.
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