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Old 4th October 2020, 05:28 AM   #1
caraudioguy2100 is offline caraudioguy2100
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Default JL Audio 1000/1

When trying to power up the amp it draws excessive current .

I checked all outputs and power supply fets they all test fine .


Only thing I noticed is on the power supply fets between gate and source legs I get 47 ohms I think thatís normal for this amp .

Any ideas since I canít seems to find anything shorted
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Old 4th October 2020, 09:10 AM   #2
Perry Babin is offline Perry Babin  United States
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Does the current draw start IMMEDIATELY after remote is applied or does it take 2-3 seconds for the excessive current draw?

Yes. You should read the gate resistor value.
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Old 4th October 2020, 09:33 AM   #3
caraudioguy2100 is offline caraudioguy2100
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I will have to get back to you on that .

Testing a large amp and my power supply broke again .

Blew the transistors that I just replaced
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Old 4th October 2020, 09:39 AM   #4
Perry Babin is offline Perry Babin  United States
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Did you replace all of them?

Did you confirm that all of the series resistors were within tolerance?
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Old 4th October 2020, 09:57 AM   #5
caraudioguy2100 is offline caraudioguy2100
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I replaced them all . And I checked the source resistors . I replaced them again and now my supply is up and running .


Back to the amp .

It takes 2 to 3 secs when applying the remote for the amp to draw current
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Old 4th October 2020, 10:00 AM   #6
Perry Babin is offline Perry Babin  United States
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Confirm that the FET that's driving the low-voltage transformer has oscillation on it's tab before the current draw begins.
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Old 4th October 2020, 10:17 AM   #7
caraudioguy2100 is offline caraudioguy2100
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Yes I get oscillation before the amp draws current
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Old 4th October 2020, 02:25 PM   #8
Perry Babin is offline Perry Babin  United States
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That would seem to indicate that the problem is in the rail supply.

Check the rectifier
The 4 diodes near the 5w resistor R871
Twist the transformer to see if that makes a difference.
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Old 5th October 2020, 03:19 AM   #9
caraudioguy2100 is offline caraudioguy2100
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The diodes check fine . Tried pulling /twisting the transformer no change .

I pulled the rectifiers and the current draw stopped .

I checked the rectifiers in diode check but they test fine
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Old 5th October 2020, 10:04 AM   #10
Perry Babin is offline Perry Babin  United States
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Shorted secondary PS inductor?

Possible output driver board faults?

Did you check the output FETs carefully?
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