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Old 18th November 2010, 06:08 PM   #41
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oh my mail id

ravslanka@gmail.com
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Old 19th November 2010, 10:19 PM   #42
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you got it
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Old 19th November 2010, 10:23 PM   #43
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i think i got everything on my power supply board replaced. can i leave it unplugged from the output board and test it or should i wait?
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Old 19th November 2010, 10:40 PM   #44
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If you don't plug it into the audio board, monitor the DC voltage across the outer two, large wires that would go to the audio board. If the DC voltage goes above the rated voltage on the filter caps, shut it down so it doesn't blow the caps.
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Old 20th November 2010, 07:13 PM   #45
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hi bdgf2004

thanks a lot i got it

ravs

be a vegeterian.........
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Old 21st November 2010, 02:26 PM   #46
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i mounted the board back into the amp and attemped to power it up. but when i apply remote voltage there is a screatching noise. i only left it on for a second or so.
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Old 21st November 2010, 02:30 PM   #47
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oh yea, it was pulling excessive current. i have an autobile headlight in series with my power wire.
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Old 21st November 2010, 07:02 PM   #48
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Did you install all of the screws that connect the board to the heatsink?

If the FETs are clamped to the heatsink and you have an inline current limiter, it's virtually impossible to damage the FETs. Do you have a scope?
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Old 21st November 2010, 07:58 PM   #49
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yes i do have a scope. the sound seems to be coming from around one of the transformers or fets in that area
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Old 21st November 2010, 08:12 PM   #50
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Check the gate signal on every FET in the power supply to confirm that all have the same signal and the waveform, on the falling edge, is a straight vertical line down to within ~2v of ground.
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