Hi All
I need some direction on a possible repair
I have a strange issue with my Poly 61. The unit works completely but when powering on, there is an audible sustained note that cannot be stopped, similar to that of pressing i.e. a sustain pedal even though nothing is connected. When a press keys the note changes pitch but does not stop. Second to that when chords are played the notes are out of tune at random. Playing the same note will 90% of the time be correct pitch, but at times completely out of tune.
I have checked the board for defects and I can find none.
Where do I even start trouble shooting?