I've had my NAD C370 for years and just yesterday when I turn on the power button, nothing, its absolutely dead, no lights, no noises, dead to the world.
I've read through some articles in this site and I'm still unsure how to proceed. Is it the internal fuse? or something else?. If it is the fuse what's it specification and where would I get one just to give it a try. I phoned the local shop I bought this from and all they can do is return the unit to NAD who will charge £150 just for looking at it.
I'm no expert in electronics but I'd rarther have a go at something than just hand over money to NAD with no real idea whats wrong.
User manual here http://nadelectronics.com/img/manual/NAD-C370.pdf
Read page nine for some simple troubleshooting tips and see if that helps.
It *could* be a fuse but given you've owned it for a while and NAD amps often have capacitor issues in the power supply, chances are it needs some serious work by a good tech. Contact NAD directly and see what they recommend.
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Check first if you got +68/-68V on amp module left and right on contact CZ302 and CZ402 pin 2 & 7. Often the -68V is missing. This is caused by faulty transistor Q713 in +68/-68V power supply. It's a 2SA872.
Check the speaker wiring for shorts, a common problem. If everything checks out there may be bad solder joints on the main board especially in the output stage, or there is a fault in one or more driver transistors.
You need to look inside. There will be a fuse inside too. If your lucky it will restore the amp once replaced, but if it blows again you have a fault. You can track it down yourself if your any good, you might even see a burnt out part when looking for that fuse, otherwise get the repairman in.
This could be as simple as a bad connection at the voltage regulator IC or blown output transistors. If you have a multimeter and some experience with electronics repair, this should be fairly straightforward.
Let me know and I'll try to walk you throught the repair.
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.
With closed eyes -replace all capacitors on protection PCB
All of those caps are overheated and dry out (they lost there capacidance).Note that capacidance meter will not help you at all.
Now unit will work.
Check four big filter capacitors in the middle of unit!!!!
If they are white (NAD 10000uF/80V) DO NOT USE UNIT AT ALL!!!!