Question about NAD C350 2-Channel Amplifier

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NAD C 340

Hi my amp of 12 years has expired after hard use. No warning, no smoke, no nothing... just stopped dead. Some say its the transformer, others a capacitor(?). Is it worth fixing? What else may be the problem? Where can I find circuit schematics for this model? How much am I looking at to get it repaired? All help appreciated. Thanks

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  • GoNAD_C340 Apr 18, 2008

    Hi, thanks for reply. Yes it maybe an internal fuse. I will have it checked out. These units are quite robust and I have never had problems in the past - it would be a shame not to at least do a basic investigation. Thanks

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  • 319 Answers

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

Posted on Apr 17, 2008

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NAD 7030 just stopped working on one channel. The speaker will work if the mono button is pressed in. Could this be a fuse problem ?


most likely it will be poor soldering on the input side - the fact both speakers work in mono means the pre & main amps are working fine

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Completely dead NAD M15, is there an internal fuse that I can change ?


NAD M15

Problem : Dead


Possible solution : Check for Power Supply

How to Test a Transformer: 7 steps - wikiHow


If these has been done,


• Check amp power supply and low voltage regulators

These includes fuses ( many of them )



Tech Center tells you how to use a multimeter .

• There could be other electronic components but try on them first.


If the torroidal transformer is OK , then it could be a problem on the

Circuit boards.

There could be a shorted components somewhere.

Jul 29, 2012 | Audio Players & Recorders

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

Nad c270 buzzing in amp


The buzzing is coming from the transformer. It is almost expected of an amplifier of this size, that the transformer (a large one) will excite the resonance of the casework and make some noise.

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Nad 310 no power


The output should be 24v ac. Sounds like you have a busted transformer. Did you check out the resistor in front of the transformer.

You sound like you know what your talking about so I will not bore you with suff like glass fuses and thermal couples.

Good luck, I have had a few items like this over the years. Sometimes it's just best to send them in to the manufacture. I would look for a replacement transformer. 120v ac to 24v ac around 5 amps. Test it out and see if it works... If not, send it in.

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1 Answer

No power at all on NAD C370


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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Need a transistor spare part for NAD C340


Odd a transistor would have such a #. No 2Fanything series. It is most likely a 2SA949.... a PNP audio driver transistor.
It can be replaced by a NTE-383 (ECG383) transistor, though it's best to order the original # from a Japanese semiconductor supplier like MCM in Ohio.
It's best brought to a good hi-fi or guitar amp repir shop for a proper go-thru & repair.

Mark S. CET Sr. Dover, NH

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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.
Dan

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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.

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