Question about NAD C370 2-Channel Amplifier

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NAD C370 problem

My C370 has packed up suddenly and without warning.  Specifically, it powers up, all the buttons seem to work but the signal that reaches the speakers is 'un-amplified' i.e. one can hear a very quiet, high-pitched version of what should be coming out.(Sounds like a pair of headphones from a distance.) Have tried different sources, checked all the cabling - always the same problem.  Any thoughts.

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Check the two connectors in back between the PRE OUT and the MAIN IN. Make sure they are positioned horizontally not vertically. Unfortunately, they will fit both ways and it you position them vertically, you will get exactly the problem you described. This happened to me recently after doing some repair work.
Hope this helps.
Lloyd.

Posted on Sep 22, 2008

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Sounds like a headphones and the power is there,of course power supply is good because there is a little sounds.This is the most common problem of the power amp.section.The solder holding the IC of that power amp.is crack you better reheat or resolder it.The cause of cracking is the vibration and temperature changing it tooks how many years that's crack comes out.The big IC there which you going to reheat is the STK IC.If nothinng improvments happen,you better change that IC,so better performance comes out,.

Posted on Jun 17, 2008

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I would suggest that the fuse in the amplifier has blown. This is usually caused by a bad amplifier component (duh!).

The unusual part of your problem is that sound is being passed. When a component dies, signal stops as the continuity is broken.

Which could also suggest the power supply. Transistors work like relays, you turn on the control signal and the transistor opens or closes. It isa possible that this control voltage is not being passed.


Either way, this will require shop work

Jeff

Posted on Jun 15, 2008

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