NAD 705 Not power ON

[Denis 944]

Hi Expert !

I am a novice. I have an old NAD 705 which works perfectly, until I cut the speaker wire...sorry...for the first time in 2 years...After that there is no more power, nothing. I check every fuse, everything is good. I notice that there is no current at the Swicth output, so I think it is the RL_301 relay that is blown... I force the relay to turn on by jumping it (see the red line in diagram) and NAD 705 powered on, YES! So I think it was the faulty relay, I change it with a new one and reinstall it...nothing changes...the relay does not close. I check the voltage at the relay, it was only 6 Volts, it needed 13v (see diagram below). So my question, why is it only 6 volts? This is beyond my competence. Anyone have a lead? Thanks in advance everyone.

 

[turk 182]

your looking in the wrong place...

 

[Denis 944]

your looking in the wrong place...View attachment 1114905

Ok, thanks. But what i have to do to got 13 volt for the relay ?

 

[turk 182]

you have to determine if there's a fault in this circuit or the output section which is why the protection circuit is inhibiting the relay via the micro processor's monitoring.

 

[Denis 944]

Ok perfect. And what I have to check ? Considering that the initial cause of this was short cut speaker wire…

 

[turk 182]

if you did indeed short the output then stop trying to bypass the relay and check ahead of the the relay for DC on the output.

 

[Denis 944]

Ok thanks for your help, but i think i have not enouf knowledge to continue alone without more assistance.

 

[Denis 944]

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Résultats de traduction​

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How can I test the DC at the output if there is no electricity going to the output, because the relay is open? No light on the panels, the external socket is off, etc... because now, no DC at the ouput !