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Re: HELP PLEASE. NAD 370 JUST DIED...
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.
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I had exactly the same problem and quickly repaired it: One of the two 10000uF 50V 85C caps was open circuit; replacing both of them solved it entirely. If you do this yourself, be very very careful to prevent shock.
You'll need to take it in and have an electronics technician fix it. Sounds like it has popped a channel. Sometimes it just happens.
But you might also check your speaker wiring. Sometimes it gets frayed and shorts, which will strain the outputs and sometimes cause damage that doesn't immediately kill the output transistors.
This is not customer serviceable.
Steve Greenfield Electronic Engineering Technician student Electronic Technician 20+ years CET Computers and Consumer Electronics IPC-A-610D CIS Specialist
Just came accross your post accidentically, while reparing my own C320BEE. May be it 's too late for you now, but it could help others: I had the very same symptoms as you described and after a long search found out that the trouble was R45 in one of the 18V regulators. (R45: 33 ohms 1/2W fuse resistor, situated more or less half-way between the two "metal towers" on the main board. Replace by a somewhat stronger type 1W or so.
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.
I, too, have the 3150 and have experienced problems with it. With me the INPUT knob is touchy and needs micro turns sometimes to get both channels to come through. Also, it sounds like the pots are dirty as I get a scratchy sound while adjusting the knob. I have been told that these units are great middle of the road audiophile units. Actually, for the price of a used unit you can't do better. I just had an NAD 2400 THX amp delivered today and am using the 3150 as a preamp. My girlfriend is not feeling well and sleeping in the bedroom, though, and I can't listen to it :( The few minutes I heard of Steely Dan's Cousin Dupree made me bout **** myself (until I got the dirty looks). Sorry I wasn't more help! Goooooo NAD!
Have you checked the rectifier diodes / bridge rectifier . Most DMMs have setting where you can test for forward voltage drop on a diode 0.300- 0.800v depending on the type. If it reads nothing , swap the meter leads. Also check the leads coming from the power transformer and see if there's continuity. THey will read low value ohms
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.
check your output stage for bad speakers cable or bare wire of cable touch the body of amp----short circuit speaker cable----bad speaker it self------ bad input cable or defective input device . disconnect all and check if it is ok---start to connect one by one from input to outputs------if all above failed you must contact service center for help.