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Old 22nd June 2010, 06:27 PM   #1
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Default Kole Audio Amp

I got this amp in for repair . It had no output so i removed the board from the sink and redid some solder connections.

With the board out of the sink it will power up and produce audio.

If i put the board back in the sink and put all clamps back in the amp will power up fine but not produce audio and the rca jacks will spark like the heatsink has voltage.

Something conducting?? Or what might cause this
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Old 22nd June 2010, 06:36 PM   #2
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With it clamped down and no power applied, what is the resistance from the B+ terminal of the amp to the RCA shield?
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Old 22nd June 2010, 06:53 PM   #3
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2.032 k ohms and it continues to climb
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Old 22nd June 2010, 07:00 PM   #4
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Try twisting the transformer to see if it changes.
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Old 22nd June 2010, 07:15 PM   #5
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Twisted the transformer and got 3.92 k ohms now. Left channel produces clean audio right channel still dead
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Old 22nd June 2010, 07:23 PM   #6
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Does the heatsink have any voltage on it?

Do the RCA shields have any AC or DC voltage on them? Check with your scope as well as your multimeter.
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Old 22nd June 2010, 07:38 PM   #7
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Heatsink has 45.2 volts on it. Rca jacks have -0.72 volts on them
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Old 22nd June 2010, 07:41 PM   #8
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Check the resistance from the tabs of the rectifiers and outputs to see if any are shorted to the sink.
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Old 22nd June 2010, 07:53 PM   #9
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Check isolation between power transistors and heathsink.
Some amplifiers used metal anodized isolators, and these can break down.
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Old 22nd June 2010, 08:10 PM   #10
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Ok i found one shorted to the sink.

I took the entire board out of the sink again since the right channel still doesnt work.

I see alot of crappy solder joints on this board so i will re solder them and see it i can get this amp up and running.
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