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Old 10th August 2010, 01:33 AM   #1
timwebb is offline timwebb  United States
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ok i got this amp in and i got ut to power up but one of the channels is making the sub osc what would cause this?
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Old 10th August 2010, 01:57 AM   #2
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High or low frequency oscillation?

Is the oscillation visible on the speaker terminals?

Does it do it with no RCAs plugged in?
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Old 10th August 2010, 02:10 AM   #3
timwebb is offline timwebb  United States
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it makes a pop then osc low i pulled the two burn output transistors but i still get a protect light when i put them in
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Old 10th August 2010, 02:14 AM   #4
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Does it do it with no RCAs plugged in?
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Old 10th August 2010, 02:24 AM   #5
timwebb is offline timwebb  United States
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yea i even took the driver card out and it still does it
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Old 10th August 2010, 02:38 AM   #6
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Is the power supply pulsing on and off?
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Old 10th August 2010, 02:52 AM   #7
timwebb is offline timwebb  United States
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no it stays on i checked the driver signal and its showing a distorted signal like its osc to fast i changed the drive transistors and it still does it and pin 5 on the 494 is distorted
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Old 10th August 2010, 06:13 AM   #8
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How is the signal on pin 5 distorted?
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Old 10th August 2010, 10:55 AM   #9
timwebb is offline timwebb  United States
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there are small pules on the sawtooth wave
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Old 10th August 2010, 11:03 AM   #10
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Remove Q41 on the power supply driver board to see if it makes a difference.
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