I have the NAD C370, For some strange reason it blew the the fuse by the on/off switch, I replaced it & it worked ok for a few days, then blew again. I disconnected the leads to the main board, put another fuse in, blew again, disconnected the supply to transformer, put fuse in, didn't blow, reconnected supply, didn't blow, reconnected to main board, didn't blow & powered up, switched it on & off a few times, then blew again. Is it possible the transformer has a intermitent fault? Please can you help, I'm really stuck on this.
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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.
Hi, Very unlikely your repair of the RCA caused any damaged as preamp shouldn't cause big issues in the amp and would say you right that the problem existed already. The resistor is 100 ohm 5% but there is almost definitely blown outputs to have caused it. Most electronic places should be fine to test advise and repair. Would suggest outputs and drivers, but unfortunately not always that simple. Best of luck
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.
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!!!!