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Old 5th September 2011, 08:16 PM   #1
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Default JL Audio 500/1

Does anyone know the value of the gate resistors on this amp..

The board says rev 11

And its using IRFZ44's as the power supply fets
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Old 5th September 2011, 08:35 PM   #2
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JL Audio 500/1 repair info
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Old 5th September 2011, 08:58 PM   #3
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47 ohm. When you install them, install them with about 3/16 of clearance so they don't damage the board if it fails again.
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Old 6th September 2011, 01:14 AM   #4
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I noticed the outputs are shorted also..

When ordering replacements do i order the IRF540's or the 540A's ??

Just asking because i think i read somewhere that theese amps do funny things sometimes when replacing the outputs..
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Old 6th September 2011, 04:20 AM   #5
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I've used both the IRF540 (no suffix other than PBF) and the IRF540A with no problems. The IRF540N was the transistor that caused problems in some amp but those were class AB amps. I don't know if they cause any problems in this amp.
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Old 11th September 2011, 08:54 PM   #6
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Ok almost done putting the parts back into this amp..


Which one is the Bias pot in this amp or are both of them bias pots??

R565 and R563
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Old 11th September 2011, 09:21 PM   #7
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Neither is bias. In general, class D amps don't have bias pots. Don't turn either one.
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Old 11th September 2011, 10:36 PM   #8
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Do you happen to know the values of R515 and R516 ??
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Old 11th September 2011, 11:42 PM   #9
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R515 = 10 ohms
R516 = 47 ohms
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Old 11th September 2011, 11:44 PM   #10
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Thanks..

The drivers 4 the othputs are 2N3906's Locations

Q510
Q509
Q503
Q501

Correct or are there more drivers for the outputs??
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