JL Audio 500/1

mike49504 · 5th September 2011, 08:16 PM

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

bdgf2004 · 5th September 2011, 08:35 PM

JL Audio 500/1 repair info

Perry Babin · 5th September 2011, 08:58 PM

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.

mike49504 · 6th September 2011, 01:14 AM

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..

Perry Babin · 6th September 2011, 04:20 AM

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.

mike49504 · 11th September 2011, 08:54 PM

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

Perry Babin · 11th September 2011, 09:21 PM

Neither is bias. In general, class D amps don't have bias pots. Don't turn either one.

mike49504 · 11th September 2011, 10:36 PM

Do you happen to know the values of R515 and R516 ??

Perry Babin · 11th September 2011, 11:42 PM

R515 = 10 ohms
R516 = 47 ohms

mike49504 · 11th September 2011, 11:44 PM

Thanks..

The drivers 4 the othputs are 2N3906's Locations

Q510
Q509
Q503
Q501

Correct or are there more drivers for the outputs??

5th September 2011, 08:16 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	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

5th September 2011, 08:58 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

6th September 2011, 04:20 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th September 2011, 09:21 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Neither is bias. In general, class D amps don't have bias pots. Don't turn either one. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th September 2011, 11:42 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	R515 = 10 ohms R516 = 47 ohms __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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5th September 2011, 08:35 PM	#2
bdgf2004 diyAudio Member Join Date: Oct 2010	JL Audio 500/1 repair info

6th September 2011, 01:14 AM	#4
mike49504 diyAudio Member Join Date: Sep 2006	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..

11th September 2011, 08:54 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	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

11th September 2011, 10:36 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Do you happen to know the values of R515 and R516 ??

11th September 2011, 11:44 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	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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