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Old 22nd June 2009, 12:49 AM   #1
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Default power acoustic 620-2

i am tryiing to fix 2 of these identical amps at the same time, i hope to save money on shipping when i order parts. they have completely different symptoms

this one can actually make sound. the problem is that it is very scratchy. i need to have the level turned almost off for it to make sound and as soon as i raise the level the test speaker goes crazy. nothing seems to be getting really hot and i cant see any burnt parts.

i measured the op amps and one leg is reading 26v i figure this is probably a good place to start
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Old 22nd June 2009, 05:38 AM   #2
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What's the resistance from the RCA input shield to the non-bridging speaker terminals?
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Old 22nd June 2009, 05:47 AM   #3
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23 k ohms
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Old 22nd June 2009, 06:07 AM   #4
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You may have an open trace or a broken ground on the RCA jack. Check both. Compare it to your other one but I think it should read 0 ohms.
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Old 23rd June 2009, 01:35 AM   #5
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yup that was it. even the super cool plasma shere took off and its better than i had expected it to be.

thank you
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