Question about NAD C320 2-Channel Amplifier

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Nad c350 no power at all

Hi my c350 does not seem to power up at all.
I have checked the fuses just behind the big round transformer, they seem fine. My new NAD C 325BEE has stopped powering up. I push power on button on the remote and the lid blinks with red but stays abmer not turning into green. I can rotate the volume button using remote but leds above source indicators are not lit. If I try to turn them directly bu pushing the button on the amplifier, nothing happens: power led stays amber, no sound.
Please help

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  • dindop Aug 24, 2008

    Same thing happened to my C355BEE, twice. After the first incident, i brought it back to my dealer and they repaired it. Then it happened again after 2 weeks... it simply stays at amber and never turns to green. Dealer then suggested an upgrade to C272/C162, but after one night of playing, my C162 preamp stays in amber, refusing to go green :(

    What's happening to NAD products? Seems their QA/QC is a bit wanting...

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  • 682 Answers

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.

Posted on Aug 24, 2008

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1 Answer

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Hi,
There are fuse inside Nad M15. If you open the top cove then you can see there are 9 fuses lined up i the circuit board on the right side of the transformer. Check these fuses. Also check is there is any fuse behind the Power one of switch. If it is faulty the replace the same.


Before connecting the power after replacing the fuse. check the working voltage marking at the back side. Is it 120v or 220v. If its 120V then be sure that you are using 120V AC line.


If any fuse blows of when you connect the power then you have to consult any nearest service station.


The Voltage rating and Amps rating of the fuse can find marked up on the two metal strips at the two ends. My be laser mark or punching.


Check the link bellow to see the fuses
Check the 12th picture on the link.
NAD M15


AJIN

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1 Answer

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Hi...

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

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1 Answer

Nad c350 no power at all


Solution if all fuses checked out OK and +/-40V are present on main PCB DC connector from power supply:
Check for +37V and -37V on small sub-power supply PCB - mounted vertically on the main power supply PCB. (next to ribbon cable connector is a layout with voltages.) If the +/-37V are missing check (replace) C501 (0.1uF) on the small power supply PCB for leakage, but also check (replace) R401 (2R2) and R402 (2R2) on the main power supply PCB. Both resistors are fuse-resistors and will have gone open circuit when C501 has gone leaky.

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You should repleace the old transformer with the new one

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If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

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Check fuses mounted near transformer . If blown check output transistor. Also check transistor transistors on small heat sink . they will cause fuse to blow.

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hey,

I have noticed that this nad c3xx series may have a general problem with the input switching chip. There are more post here on fixya where people have similar problems as you have.

For a few year ago, I repaired a fault that had close to the same symptoms, it was a cambridge azur xxx amplifier, in this cambridge it was a defect smd component that they used as a input multiplexer.

I look forward to repair this fault in the future. Nowadays i alway collect schematics and create repair e-books and/or repair movie guides in the fault finding process.

You can check out http://www.miguelovitch.dk

;) /michael

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