NAD C320 - No output from Speakers

[jmascreen]

Symptoms

No Output from speakers with any source input

Working fine as Pre Amp and Head Phones out as well

Can someone here guide me to possible cause of this problem?

 

[goodolpg]

Are the jumpers in place on the back of the unit between pre out and main in?
Tape monitor switch in correct position?

 

[Binkman]

Welcome to AK;
Unplug headphones and above noted tape1 monitor off.
Service and user manuals.
https://www.hifiengine.com/manual_library/nad/c320.shtml

 

[jmascreen]

Are the jumpers in place on the back of the unit between pre out and main in?
Tape monitor switch in correct position?

Yes the jumpers are in place and tape monitor switch is fine,without the jumpers headphone doesnt work

 

[Binkman]

Don't know if you have any experience? this is complex amp.
The manual schematics shows 4 fuses but lists only one. If they check okay you have other issues.

 

[Goldie99]

You do realise the speaker outputs are disconnected when you connect headphones ?

If that's not it, then it sounds like it might be in protection mode - does the relay click in shortly after powering up ?

 

[Binkman]

Hey Goldie! yes he pulled the h.ph's and monitor sw off. .. It does have two relays listed. obvious the power relay clicks and has preamp working. I cautioned OP's experience. so lets get some feedback before jumping in.
bink.

 

[Goldie99]

Hi Bink, no problem - I actually read / understood the OP's comments differently.
I'm not seeing any power relay by the way - a protection relay, and 8X input relays, but nothing on the main power. We looking at the same (hfe) manual ?

 

[jmascreen]

I dont have any technical experience. One of my friend suggested since the headphones are working it could be the amp doesn't understand the headphones are disconnected.

Don't know if you have any experience? this is complex amp.
The manual schematics shows 4 fuses but lists only one. If they check okay you have other issues.

 

[jmascreen]

You do realise the speaker outputs are disconnected when you connect headphones ? Connected or not connected no output from speakers

If that's not it, then it sounds like it might be in protection mode - does the relay click in shortly after powering up ?

Yes I can hear the relays triggering and its not in protection mode. when it goes to protection mode it used to stay red at power led.