Nad 7155 problems

Lioneye · 28th May 2006, 07:27 PM

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,

Leolabs · 29th May 2006, 01:54 AM

Check whether the protection circuitry activated or not.

djk · 29th May 2006, 06:49 AM

Are the RCA jumpers installed?

Lioneye · 29th May 2006, 07:26 AM

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

Lioneye · 29th May 2006, 10:21 PM

Yes rca jumpers are in - still no output. 3 fuses inside, all good . any ideas now??

djk · 30th May 2006, 03:14 AM

Time for a copy of the schematic and a volt meter.

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

28th May 2006, 07:27 PM	#1
Lioneye diyAudio Member Join Date: May 2006	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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29th May 2006, 01:54 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Check whether the protection circuitry activated or not.

29th May 2006, 06:49 AM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	Are the RCA jumpers installed?

29th May 2006, 07:26 AM	#4
Lioneye diyAudio Member Join Date: May 2006	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

29th May 2006, 10:21 PM	#5
Lioneye diyAudio Member Join Date: May 2006	Yes rca jumpers are in - still no output. 3 fuses inside, all good . any ideas now??

30th May 2006, 03:14 AM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	Time for a copy of the schematic and a volt meter. An experienced tech could do it without the schematic, but it saves time.