Faulty NAD c370 amp

[Wox]

Hi, I wonder if anyone on here could help me? I have a NAD amplifier that sometimes loses sound to one speaker. I have changed the speaker and still the problem persists so it is the amp. I have cleaned the pot and visually checked the caps but no joy. Does anyone have any experience of this problem in amps?

[budm]

Re: Faulty NAD c370 amp

Did you already try cleaning controls and switches? You can also try swithching the Main In in/ Pre-out left and right to see if the problem will still stay in the same channel. It can also be intermittent speaker relay's contacts.

[Wox]

Re: Faulty NAD c370 amp

Thanks for your reply. I switched inputs but still the same problem. I have taken the pot apart and cleaned it but no joy. Do you mean clean out every control switch? I read somewhere about the caps in amps, could these be the problem? They look fine.

[selldoor]

Re: Faulty NAD c370 amp

If the headphones cut the speakers when plugged in you could check that part of the switch inside the socket is not sticking open when the headphones are removed. I dont know if the switch IS that type but it is worth checking.
Is the failure on both speakers and headphones

[budm]

Re: Faulty NAD c370 amp

"I switched inputs but still the same problem" I am talking about the Power amp main In put and The Pre-Out jacks on the rear panel. This unit can be used as a preamp or as a power amp unit. What we are trying to find out if the problem is in the power amp section or in the pre amp section. There should be 'U' shape link that are installed in the Main in/pre out jacks. You can also try activating the Tape monitor switches in and out a bunch of time to see if it helps.
For example:
http://img249.*************/img249/4...jumpers5jy.jpg

[Wox]

Re: Faulty NAD c370 amp

Excuse me for being a novice with amps. I fix LCD tvs and thought this would be an easy fix. I will look inside it again tomorrow and get back to you. Thanks again.

[Cobra2]

Re: Faulty NAD c370 amp

Try replacing the protection-relay(s).
Most common fault with NAD-amps are protection circuits & caps in that area...

Arne K

[Ragged]

Re: Faulty NAD c370 amp

When exactly does this happen? Which input are you using? please be precise.