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I have purchased 2nd hand a Poly 800 reversed keys edition and it was working couple of times. Today sudenly when powering the unit the display was flickering. At the moment of pressing the keys, the numbers on the display were flickering, getting a little bit darker like loosing power. No sound came out.
It seemed that the poly 800 was reseting itself. I have swithced on/off the unit a couple of times. After that strange behaviour the display is now working, also when I trying to access the sound parameters and inputing data all seems to work. However there is no sound! On some presets I'm obtaining strange sounds at a very low level. I tried also to change OSC volume and EG settings however nothing changed. I have read that maybe the unit must be reprogrammed, but I don't think this is the case. Or is it?
What else is wrong? Is it maybe the PSU?
Thank you for your answers.