Question about NAD Audio Players & Recorders
My nad get's into protection mode and satays there all the time. from i press the on button til i take it off again, I opened it up and checked for anything burned. everything looks intact. i don't know what could do it.
Assuming the protection circuit is not faulty, I would look to the devices on the heatsink to the cause of the fault.
Posted on Aug 19, 2013
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Posted on Jan 02, 2017
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
After thorough cleaning of the speaker leads, PC Boards etc, I desoldered all the leads of the main two power transistors of the Left channel that had given problem earlier. Switched on the amp and bingo, it did not go in protection mode which confirmed that the two power transitors were the culprit. After checking the voltages and values of some other vital componenets vis-a-vis remaining left channels, it was confirmed that the circuitry was okay. The power transistors were checked again and found to be okay as well. I then took a chance and resoldered not only these two Left channel power trnasitors but also resoldered all the leads of all the other power transistors as well.
The amp was switched on again and this time also it did not go into protection mode. The amp is working fine. Problem could be either dry solder or short of power transistor leads by stray solder waste strand. There was no need to change any part which was great.
Thanks for help anyway.
Posted on Nov 30, 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
i need a power amp. brand that has a 4ohms impedance that who will match my 307d2 4 ohms (pioneer) sub woofer that can use inside my house
Posted on Jan 13, 2010
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