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Old 24th September 2012, 01:42 AM   #1
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Default JL AUDIO 250/1

Anyone know the values of the power supply gate resistors ??

The gate resistors in this amp are all burnt to badly to read the numbers..

Its a REV 1 board
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Old 24th September 2012, 04:43 PM   #2
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Anyone know?
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Old 24th September 2012, 05:06 PM   #3
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47 ohm
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Old 27th September 2012, 03:14 AM   #4
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Replaced the Gate resistors , The drivers for the power supply fets and replaced the Power supply fets..

With just power and ground hooked up the amp will draw excessive current..


Any ideas on what to check?
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Old 27th September 2012, 07:22 AM   #5
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Do the power supply FETs heat up?
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Old 27th September 2012, 01:07 PM   #6
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Power supply fets are getting hot..

If the outputs are out of the amp the amp powers up and idle's perfectly..


If i put the outputs in the amp and only hook power and ground up NO REMOTE the amp will draw excessive current and the power supply fets and the outputs will get hot
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Old 27th September 2012, 06:55 PM   #7
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Do you see any oscillation on the output pins of the SG3525 when the output FETs get hot?
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Old 27th September 2012, 08:09 PM   #8
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On Pin 14 i get a square wave but it is bouncing around the display on my scope.. Its a square wave but its not clean and not steady..

Pin 11 i get nothing that looks like a square wave at all It just line going everywhere
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Old 27th September 2012, 08:15 PM   #9
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Is the signal sensing set to 'on'? If so, switch it off. Does that make a difference?
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Old 27th September 2012, 08:30 PM   #10
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Switching it to the off posistion makes no difference

I replaced the power supply driverboard with 1 from a working amp

Still have the same thing

Last edited by S Merlington; 27th September 2012 at 08:58 PM.
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