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Old 19th January 2011, 05:48 PM   #1
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Default JL AUDIO E6450

I got this amp in for repair. The amp had 2 blown outputs so i removed them .
I still have problems with that channel since the new outputs got red hot .

The other problem is the amp is producing both + - regulated and rail voltages but i have no output out of any of the channels.

Any ideas on where to look?
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Old 19th January 2011, 05:56 PM   #2
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Ok i checked again . ALL of the outputs get hot within secs
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Old 19th January 2011, 06:34 PM   #3
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did you check the output drivers?
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Old 19th January 2011, 07:11 PM   #4
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Biasing?

Gate resistors?
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Old 19th January 2011, 08:01 PM   #5
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i removed 4 bad outputs from this amp the other 8 are still in it.

All 8 get red hot within secs . The 4 i removed where bad the other outputs that are still in the amp tested fine.

Do i need to turn all of the bias pots down in every channel?

Also when i connect a sub to any channel i get fluttering on the outputs .

I tested for DC on the outputs but theres none.
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Old 19th January 2011, 08:08 PM   #6
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Turn all 4 channels down but before you do, measure the bias voltage across the test points to see what the factory bias is.

Do you get fluttering with no RCAs plugged in?
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Old 19th January 2011, 08:33 PM   #7
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Well i figured out the fluttering problem.

Wheres the test points for the bias on this amp?
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Old 19th January 2011, 08:40 PM   #8
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Near the white source resistors.

What was the fluttering caused by?
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Old 19th January 2011, 10:13 PM   #9
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When i plugged in the RCA's i didnt notice it at first but i had the rca's plugged into my sine wave generator not the test deck
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Old 19th January 2011, 11:06 PM   #10
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Ok are you talking the diodes for the test point or is there anyway you can put arrows in the pic thats in the previous post?
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