Question about NAD C350 2-Channel Amplifier

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Output volume has dropped in right channel

I first thought the right channel had gone completely dead. After checking, I found out that the channel wasn't completely dead, but the volume had dropped considerably. I have tested the right speaker and speaker-cable on the amplifier's left channel, and then it works fine. I have also removed all the inputs to the amplifier and tried with other inputs. The problem is still there. My conclusion hence is that the problem is in the amplifier. Anybody having any suggestions on what's wrong with my amplifier? Thanks.

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Re: Output volume has dropped in right channel

Dear sir,pls check the HT voltage fuse, LTsupplay also and out put stage,and volume controle,

Posted on Feb 01, 2007

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Right channel distorted denon UDRA M7

Hello there, I have the same amplifier and now it has the same problem on the right output. Have you found out how to fix it? Thanks!

Nov 07, 2013 | Amplifiers & Preamps

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One side dead

hi zm_16dec,

Right chanel fully dead , output transistor burnedout ,

Without knowing the make and model of your amplifier

all i can advise is to replace the unknown part number of

the transistor.

Look for the working left channel output transistors and

replace the bad transistors in "pair". These may include

other components but check on it as well.

Check the speaker system, especially where that channel

is connected.Inspect speaker wires or cable up to the speaker


Amplifier wont blow without reason.It could be from the wirings,

speaker or volume settings of the unit.

Thanks for choosing Fixya for assistance!

Dec 24, 2012 | Amplifiers & Preamps

1 Answer

I have acquired a CE2000 that has a dead channel. What is the most common items that go bad affecting one channel only? Also, Are schematics available?

If you turn up the faulty channel and you can hear nothing, then it could be the pre-amp that's gone, otherwise it could be the power amp. The most common cause is a faulty output transistor. It will be open circuit, not short as that would blow the fuse. Though some amps do have a fuse for each channel. The good news is that the other channel is the same as the bad one. So all readings taken with a multimeter should be the same. So if you find a bad/wrong reading IE one that doesn't match the good channel, you have found the source of the trouble.

Jan 26, 2011 | Crown CE2000 2-Channel Amplifier

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My Technis SU-Z25 has gone dead on one output channel

Reconnect the speakers and confirm if the other speaker is working fine by switching. if so use a multimeter to check if any fusible resistors to the output is open. this can happen when there is a load on the output. make a voltage check with referance from the other channel.Some biasing to the stage can also be faulty/ The most possible chance could be the output drive.
Replace. Helpful? Good day

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Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)


I've contacted ADCOM before and they sent a pdf of the electricals

also try:

Mar 30, 2010 | Adcom GFA-7400 5-Channel Amplifier

1 Answer

Volume at 10 produces very low speaker output.!?

It sounds to me that all you are getting is the pre-amp stage of the amp and nothing from the power amp stage. As it is on both channels then it is something that is common to both. This could be something to do with the power supply of the power stage. Or whatever is on the heatsink. It could be that the amp uses a single audio amp IC for both channels. If it does my bet is that it's gone. If it uses two sets of semiconductors for the right & left channel it would be highly unlikely that both channels have gone, but not impossible.

Dec 27, 2009 | Amplifiers & Preamps

1 Answer

No stereo signal out from yamaha p 2500 s

It's unclear what type of connectors are on the end of the cables(s) coming from your computer.

This amp only works with mono 1/4" TRS and XLR connectors, not standard RCA connectors.

Did you try the Right one in the Left Channel to see if the Left Channel worked?

Refer to the following manual and read up on the connectors (page 7) and the use of the Stereo/Parallel/Bridge Switch (page 8). When it is NOT in Stereo Mode the unit only uses the Right Channel controls and input.

Use this switch to select the operating mode.
• STEREO mode
Channels A and B operate independently (as with a conventional
stereo amplifier). The Channel A input goes to the Channel
A output jacks, and the Channel B input goes to the
Channel B output jacks.
The Channel A input signal is output through both the Channel
A and Channel B output jacks. The Channel B input jacks do
not function. Channel A and B volumes can be independently
• BRIDGE mode
The Channel A input signal is output from the BRIDGE output
jacks. To adjust the volume, you must use the Channel A volume
control knob.

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2 Answers

NAD C272 Amplifier: Intermittent left channel

My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!

The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.

Apr 03, 2008 | NAD C272 Amplifier

1 Answer

No right channel output

Feed the amp with the left channel preamp to the right channel input on amp and check output. If you get output from amp then pre amp nedds to be checked out if still no output then amp is suspect. Randy

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1 Answer

Rotel RA 9808X Amplifier

I'd suspect that one of the two output transistors on that channel has gone bad. If you are unsure how to test or troubleshoot this, then you might try replace both the NPN and PNP outputs and catch the bad one that way. If your amp uses an output module then you would of course have to replace the module which would replace all the output transistors on both channels. Good luck. Another thing to look out for, is the emitter bias resistors. They are the large white ceramic ones near the outputs. Sometimes one of those will open up too. They will be of a very small resistance value like .5 ohms (point five ohms) or something in that general ballpark, and have a wattage value of typicaly 5 watts. So they are pretty big resistors. Be sure to check them all even if you do find a bad output transistor. They will often go out with the transistor. Good luck.

Jan 18, 2007 | Rotel RMB-1095 Power Amplifier

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