Help me to fix my nad c320: need a res value

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al1

Member
2007-08-24 1:18 am
try zeroing the speaker dc offset,i have same amplifier and i accidentally turned those blue trimpots(marginally i guess) and red light kicked off.that resistor is in the pre-amp section just wondering if that could be the cause..im newbie to electronics but had the same expirience after replacing most electrolytic caps with better ones?
 
The resistor is not your problem and I suspect the preamp is fine. The Reserviour capacitors in these amps tend to cause a problem. 2 x 15000uF with 1 2200uF and 1 3300uF The Electrolytics do dry out and may burn out. These will usually affect the protection circuit as well. Replace all the electrolytics in the protection and ISC circuit (Its only maybe 8 in total) and the amp will come alive if the 4 big electrolytics are ok. Can you measure the output voltages from the power supply.
 

Dannomite123

Member
2013-02-08 10:10 am
I recently got a C320 that was stuck in protect mode.
Sure enough it was an electrolytic cap in the protection circuit that was open circuit. I checked the rest of them and found 20 that were bad. Either low capacitance or high esr or both. NAD used some cheap and nasty unheard of brand JH caps in this amp. I replaced all caps with decent ones except for the four power supply caps which tested fine. Works good now, but the sound is not really to my liking.
 
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