Question about NAD C370 2-Channel Amplifier

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Nad C370 goes directly to protection mode

Even with no speakers attached, the amplifier goes directly into protection mode when powered on (the green power LED goes red after 1-2 seconds). After reading on Internet, I replaced the capasitors in the protection circuit. This gave no changes. All this happened suddenly, without even playing loud. Any suggestions what to check?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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VOTIT
  • 2071 Answers

SOURCE: NAD C370 problem

Sounds like a headphones and the power is there,of course power supply is good because there is a little sounds.This is the most common problem of the power amp.section.The solder holding the IC of that power amp.is crack you better reheat or resolder it.The cause of cracking is the vibration and temperature changing it tooks how many years that's crack comes out.The big IC there which you going to reheat is the STK IC.If nothinng improvments happen,you better change that IC,so better performance comes out,.

Posted on Jun 17, 2008

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  • 31 Answers

SOURCE: NAD C370 Amplifier

This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP. 

Posted on Sep 17, 2008

  • 4234 Answers

SOURCE: Nad C370

Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

Posted on Nov 05, 2008

petraman7
  • 1175 Answers

SOURCE: NAD C270 amp won't switch from red power/protection to green.

The AH may denote "slo-blo" style as opposed to Fast-acting
A fast-acting fuse will look like a single strand of wire ( maybe wiggly looking) ..A Slo-blo will have an element in it and a spring

Posted on Apr 11, 2009

  • 1 Answer

SOURCE: nad 304 amplifier no output, relais not willing to

The 2 BIAS resistors of 47kohm, R333 R334, replaced with new 1W resistors. 1 resistor was totally open and 1 resistor was 55k.

It were 1/2W resistors, replaced them with 1W resistors. Very low cost repair for a High End amplifier. Should live for another 10 years.

Regards
Marc

Posted on Jan 08, 2010

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2 Answers

Nad c370 keeps switching off


Check the speaker wiring for shorts, a common problem. If everything checks out there may be bad solder joints on the main board especially in the output stage, or there is a fault in one or more driver transistors.

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1 Answer

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Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

Nov 04, 2008 | NAD C370 2-Channel Amplifier

1 Answer

NAD C370 Amplifier


This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP. 

Sep 15, 2008 | NAD C370 2-Channel Amplifier

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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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Sounds like you have lost the power amp transistor(s) or IC for this channel.

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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. BUT!!! Most important!!! Check four big filter capacitors in the middle of unit!!!! If they are white (NAD 10000uF/80V) DO NOT USE UNIT AT ALL!!!! FIRE HAZARD!!!!! Contact me... Dariusz
Dariusz70@verizon.net

Feb 10, 2008 | NAD C370 2-Channel Amplifier

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Power light switches to red.


I suggest rechecking the speaker wiring in case there is a small "whisker" of wire touching either the case or adjacent terminal, also check the speaker end of the wires for same. Do you have a pet? I have seen wires chewed partly through by cats (& rabbits)! See the information from the manual below: http://207.228.230.231/manual/NAD-C370.pdf

Jul 26, 2007 | NAD C370 2-Channel Amplifier

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