I have a Korg sp-250 electric piano. It was working fine, then one day I turned it on and all the lights come on and piano won't play. I can hear the amp powering on so that part is ok. Power supply is ok, 12v.
Can't see any obvious faults on the PCB"s, I've pulled all the plugs and re seated them. None of the selector buttons are sticking. I can't enter test mode or anything, the buttons are unresponsive.
What are the common reasons for a fault where all the lights come on?
What else can I test? I have a multi meter and the service manual with circuit diagrams here
Thanks in advance. Really appreciate any input
Can't see any obvious faults on the PCB"s, I've pulled all the plugs and re seated them. None of the selector buttons are sticking. I can't enter test mode or anything, the buttons are unresponsive.
What are the common reasons for a fault where all the lights come on?
What else can I test? I have a multi meter and the service manual with circuit diagrams here
Thanks in advance. Really appreciate any input