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Old 29th May 2012, 02:57 AM   #1
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Default Kx1200.1

Hi guys
I'm working on a kx1200.1, no audio is coming out of the pre amp,
Any idea on how to troubleshoot the pre of this unit.
The +15 and -15 are present at the pre amp ic's.
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Old 29th May 2012, 03:03 AM   #2
timwebb is offline timwebb  United States
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u have a scope?
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Old 29th May 2012, 04:28 AM   #3
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There is a trace that commonly burns on these amps (see attached). Confirm that that trace is intact. It connects to the RCA shields.
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File Type: jpg IMG_6652x.jpg (224.6 KB, 29 views)
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Old 29th May 2012, 10:58 PM   #4
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trace is ok, and yes I have scope.
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Old 29th May 2012, 11:54 PM   #5
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Starting at the back of the RCA jacks, follow the signal. Which op-amps do you see audio on the output pins of the op-amp?

I'm assuming that you've operated all of the controls through their entire range and that made no difference.
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