Question about NAD C350 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.

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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.

Posted on Aug 30, 2008

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I have a nad 3130 amplifier which has been in storage for sometime. I've plugged it in and I have no power to the amp.


If the fuses are good....do this.....
1...unplug the amp from the wall AND KEEP IT UNPLUGGED !!!
2 Turn the power switch on ( again , the amp is UNPLUGGED from the wall )
3 with an ohm meter or a multimeter set on ohms., measure the ohms across the ac cord that plugs into the wall....in other words...take one meter lead and touch it to only one " blade" that plugs into the wall and keep it touching the " blade".....while you are holding it there, touch the other meter lead to the other " blade " that plugs into the wall.....you should get a very low ohm reading ( 2-50 ohms )......if it is over that number, your transformer or your switch is open ( toast ). hopefully it is the switch as transformers are un-available......good luck, be safe, and if you arent sure....ask before doing something silly.....Rob

Apr 03, 2015 | NAD Amplifiers & Preamps

1 Answer

Dead NAD M15


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

Jul 29, 2012 | NAD M15 Amplifier

1 Answer

No power in NAD c350


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

Apr 26, 2009 | NAD C350 2-Channel Amplifier

1 Answer

Nad c350 no power at all


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.

Aug 22, 2008 | NAD C320 2-Channel Amplifier

1 Answer

NAD C350


Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
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

Apr 29, 2008 | NAD C350 2-Channel Amplifier

1 Answer

NAD C 340


Power surges and lightening can reak havoc. It may just need fuse replacement

Apr 12, 2008 | NAD C350 2-Channel Amplifier

2 Answers

Nad amp failure


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

Mar 10, 2008 | NAD C350 2-Channel Amplifier

3 Answers

NAD 370


try to re-set mini circuit breaker inside.

Jan 21, 2008 | NAD C370 2-Channel Amplifier

1 Answer

NAD C350 stuck on "auxiliary" input


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

Dec 21, 2007 | NAD C350 2-Channel Amplifier

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