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Old 21st March 2009, 06:30 PM   #1
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Join Date: Jun 2008
Question 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!
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Old 21st March 2009, 10:28 PM   #2
infinia is offline infinia  United States
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Location: SoCal
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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Old 21st March 2009, 11:58 PM   #3
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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:

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