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Old 27th April 2011, 03:51 PM   #1
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Default Crunch GP 3000

Ok im working on this amp again after putting new + - 5 volt regulators in it.

Im running into the same problem again Amp powers up for a sec then goes straight into protection mode.

Heres what i have done to the amp.

I replaced both 5 volt regulators ( L7805 L7905) I put in a new KA78T12 regulator. I tested output driverboard in another amp and it seem to work fine.

Any ideas on where to start on this amp??
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Old 27th April 2011, 05:29 PM   #2
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Is there any DC on the output filter inductor when it powers up?
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Old 27th April 2011, 06:17 PM   #3
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I get -104.8 volts on both output filter inductors when powering it up
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Old 27th April 2011, 08:04 PM   #4
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It would appear that you have leaking or shorted outputs if the driver board is OK.

Without the driver board, do you have DC on the inductors?
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Old 28th April 2011, 02:25 AM   #5
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With no driverboard I have 0 volts on the output filter inductors
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Old 28th April 2011, 02:31 AM   #6
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You stated that the driver board seemed to work right in the other amp. Did the other amp produce clean audio with this driver board installed?
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Old 28th April 2011, 02:35 AM   #7
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Not sure didnt get that far. All i know is the amp didnt go into protection mode.

I have another driverboard here that should be in 100% working conditon since its brand new
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Old 28th April 2011, 03:21 AM   #8
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Ok right now im in the process of testing all of the outputs I removed them from the board and im checking all of them ill post back with my results
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Old 28th April 2011, 03:38 AM   #9
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Ok i tested all of the outputs and all test the same here are the readings.

1-2:OL
1-3:OL
2-3:0.451

Probes reversed
1-2:OL
1-3:OL
2-3:OL

Do you need me to post the voltages on the pads for the output driver board?
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Old 28th April 2011, 03:55 AM   #10
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Please post a photo of the inside of the amp showing the component side of the driver board.
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