Question about NAD C370 2-Channel Amplifier
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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Posted on Jan 02, 2017
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
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
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.
Posted on Nov 05, 2008
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
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.
Posted on Jan 08, 2010
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