Yamaha PSR 6700 switches on but no sound coming out,display ok, amplifier ok

[seditiouss]

Helo,guys !

I have a Yamaha PSR 6700 that after a general 220V power failure in the whole studio , power on but no more sounds. Power amplifier is working good, tested on RCA inputs. Display is working good, all functions seems to be ok only that is no more output (or input in amplifier stage).

I think maybe somebody else faced that problem before and gain some experience.

Any help would be appreciated.

Thanks in advance

 

[seditiouss]

MS1132 - ?...

 

[tauro0221]

Hi,
The first thing I would check it is the mute pin 1 since you said that everything is working with the exception of the output sound. It should be zero to disable the mute. High means no sound.

 

[seditiouss]

Power amplifier is working good, tested on RCA inputs

 

[Enzo]

Run the master volume up and down, do you hear any background sound from the speakers getting louder and softer along with the control?

HAve you tried to reinitialize the instrument?