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Thread Tools |
4th October 2020, 05:28 AM
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#1 |
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diyAudio Member
Join Date: Aug 2010
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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 that’s normal for this amp . Any ideas since I can’t seems to find anything shorted |
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4th October 2020, 09:10 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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4th October 2020, 09:33 AM
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#3 |
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diyAudio Member
Join Date: Aug 2010
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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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4th October 2020, 09:39 AM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Did you replace all of them?
Did you confirm that all of the series resistors were within tolerance?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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4th October 2020, 09:57 AM
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#5 |
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diyAudio Member
Join Date: Aug 2010
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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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4th October 2020, 10:00 AM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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4th October 2020, 10:17 AM
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#7 |
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diyAudio Member
Join Date: Aug 2010
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Yes I get oscillation before the amp draws current
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4th October 2020, 02:25 PM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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5th October 2020, 03:19 AM
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#9 |
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diyAudio Member
Join Date: Aug 2010
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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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5th October 2020, 10:04 AM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Shorted secondary PS inductor?
Possible output driver board faults? Did you check the output FETs carefully?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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