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Old 23rd June 2010, 07:36 PM   #21
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You need to check for continuity between the pads for the third legs of the 9640s to see if all are directly connected.
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Old 23rd June 2010, 07:53 PM   #22
timwebb is offline timwebb  United States
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they are all connected but one of the driver cards dose have a gain pot which i think is a bias.ive never worked on a amp that had one it may have been moved though cause the amp has been fixed before i got it.
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Old 23rd June 2010, 08:00 PM   #23
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It's probably a DC offset pot.

If the driver boards that are in parallel with the outputs are in sockets, remove them after reinstalling the outputs (before applying power).
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Old 23rd June 2010, 08:20 PM   #24
timwebb is offline timwebb  United States
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these are the driver boards
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Old 23rd June 2010, 08:24 PM   #25
timwebb is offline timwebb  United States
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i have some new parts coming should be here in a few days
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Old 23rd June 2010, 08:33 PM   #26
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The driver boards are the ones with the white heatsink compound on them.
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Old 23rd June 2010, 08:34 PM   #27
timwebb is offline timwebb  United States
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yeah should all that be on there?
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Old 23rd June 2010, 08:38 PM   #28
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Yes. The driver transistors operate at very high temperatures and without the compound and the thermal gap pads, they are prone to failure.
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