Question about NAD C370 2-Channel Amplifier
My C370 is not working -- the power LED turns red soon after
power on (it is green for a few seconds), before the speaker relays
ever get engaged.
I found your earlier posts, checked the capacitors. One was open
(c785), the others seemed ok. I replaced all of them except c784
(47u/50V), but the problem remains.
The voltages on the 8 pins of the upc1237 are like the following:
pin 1: 0.6 mV
pin 2: -15 mV
pin 3: 0.7 mV
pin 4: 4.2 V
pin 5: 0 V
pin 6: ~22 V
pin 7: ~30 mV
pin 8: 36.5 V
I suspect the problem is that pin 6 is too high. Shouldn't it be
around 1-2 V? Please enlighten me.
Thanks much and best regards,
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.
Check four big filter capacitors in the middle of unit!!!!
If they are white (NAD 10000uF/80V) DO NOT USE UNIT AT ALL!!!!
Posted on Feb 13, 2008
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Posted on Jan 02, 2017
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