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Old 28th May 2006, 08:27 PM   #1
Lioneye is offline Lioneye  United States
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Default Nad 7155 problems

I have a nad 7155 that hasn't any output at speakers or headphone. There are 2 fuses inside and both are still good. I know this is a huge open ended question, but where should I start? I opened it up, and it looks like someone may have spilled on it (long ago). Can I check t/formr output or t/sister status? I'm trying to locate a service manual now. Thanks,
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Old 29th May 2006, 02:54 AM   #2
Leolabs is offline Leolabs  Malaysia
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Check whether the protection circuitry activated or not.
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Old 29th May 2006, 07:49 AM   #3
djk is offline djk
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Are the RCA jumpers installed?
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Old 29th May 2006, 08:26 AM   #4
Lioneye is offline Lioneye  United States
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I'm replying from a remote point but as soon as I'm back tomarrow I'll check that. The jumpers aren't there,so thats probabaly it, but with no output from the headphones I didn't even think that. Question about protection circutry. other than the internal fuses, what else do I check. Also I found a burned out trace on the circut board coming from one of the 8 large transistors near the heat sink. I soldered a jumper around it but no change. Pardon my lack of experience but I am learning. thanks all. Lioneye
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Old 29th May 2006, 11:21 PM   #5
Lioneye is offline Lioneye  United States
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Yes rca jumpers are in - still no output. 3 fuses inside, all good . any ideas now??
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Old 30th May 2006, 04:14 AM   #6
djk is offline djk
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Time for a copy of the schematic and a volt meter.

An experienced tech could do it without the schematic, but it saves time.
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