NAD C370 problem

[Lynyrd]

Hello.
NAD C370 integrated amplifier.
Power on only green led on front panel.
But Amplifier not work.
No Relay click.
No red or amber led...only green.
I replaced all caps on protect board,no results.
Regards

 

[Nisbeth]

Did you check if there is continuity through the output relays when the amp is on?

 

[Lynyrd]

Ok,I will check,but it's strange no red led protect mode......only green,but Amplifier not work

 

[Lynyrd]

No 230v on CB709

 

[Lynyrd]

Its problem of standby or front panel.....

 

[Ylli]

Have you got +5 volts on pin 1 of CZ706? That voltage should be there as long as the unit is plugged in

 

[Lynyrd]

+4.1v on pin 1of CZ706

 

[sgrossklass]

+4.3v on pin 1of CZ706

Suspiciously low. Output from the 7805 regulator (IC701) should be closer to 5.6 V. Please check input voltage across C707/708. If at least 7.5 V or so, I'd supsect a bad regulator.

There is a +12V output jack (3.5 mm or 6.35 mm stereo jack) as well, please check what's coming out of there.

 

[Lynyrd]

Yes,it's working....
It was very bad C707.
Now Amplifier works fine.
Thank you very very much

 

[Lynyrd]

+12v....ok....11.84v