Yamaha PSR-330 Some keys won't play
My father-in-law lent me a Yamaha PSR-330 keyboard to play around with to help me decide on a prospective purchase. I play guitar reasonably well but have often thought I could get more enjoyment from a keyboard. My problem is, some of the keys have suddenly stopped sounding - namely A3#, D4, B4, D5# and B5. Is it something I have done? I don't have a manual, just a quick start card. If its broken, does anyone know which parts to change and where to get the parts etc?
I will never be able to live this down if I have to return it in the state it is! Sorry I have nothing else to contribute at this time but sincerely hope I will in the future.