NAD 310 buzz in left channel

Rodmunch · 21st March 2009, 06:30 PM

Hello all

I recently took back a NAD 310 integrated amp from my mom's place. I replaced it with a receiver that was remote capable, much more convenient for her.

The amp now has a loud buzz heard from the left speaker. The protection LED does not come on, and I can still hear whatever I play through the amp. I have disconnected everything but the speakers and the buzz remains. I have tried 2 different speakers as well. The buzz is definitely from the amp.

Does anyone have any idea where to start troubleshooting? I am new to troubleshooting, but I can solder and have a simple DMM to test with. I assume a capacitor may be bad, but I don't see any obvious leakage. I found the schematic that was posted on this forum but at the moment it's of no use to me lol.

Thanks everyone!

infinia · 21st March 2009, 10:28 PM

My guess is an open connection somewhere.
Use a cheap test speaker and a start tapping and/or wiggling solder connections between PCB and connectors to offboard components like line-in RCAs and other connections with little to no strain relief. When you find the source reflow the solder.

Rodmunch · 21st March 2009, 11:58 PM

Thanks, I will give that a shot.

For anyone else familiar with the amp who might have some input, here is a link to the schematics:

http://www.zeuslab.narod.ru/schemes/310.zip

When the page opens, click the link that looks like the address above.

21st March 2009, 06:30 PM	#1
Rodmunch diyAudio Member Join Date: Jun 2008	NAD 310 buzz in left channel Hello all I recently took back a NAD 310 integrated amp from my mom's place. I replaced it with a receiver that was remote capable, much more convenient for her. The amp now has a loud buzz heard from the left speaker. The protection LED does not come on, and I can still hear whatever I play through the amp. I have disconnected everything but the speakers and the buzz remains. I have tried 2 different speakers as well. The buzz is definitely from the amp. Does anyone have any idea where to start troubleshooting? I am new to troubleshooting, but I can solder and have a simple DMM to test with. I assume a capacitor may be bad, but I don't see any obvious leakage. I found the schematic that was posted on this forum but at the moment it's of no use to me lol. Thanks everyone!

21st March 2009, 10:28 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	My guess is an open connection somewhere. Use a cheap test speaker and a start tapping and/or wiggling solder connections between PCB and connectors to offboard components like line-in RCAs and other connections with little to no strain relief. When you find the source reflow the solder. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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21st March 2009, 11:58 PM	#3
Rodmunch diyAudio Member Join Date: Jun 2008	Thanks, I will give that a shot. For anyone else familiar with the amp who might have some input, here is a link to the schematics: http://www.zeuslab.narod.ru/schemes/310.zip When the page opens, click the link that looks like the address above.

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