Hi and welcome on the board.Hi, I have the inconvenience of battery low (internal). According to what I read, I initially changed the C23 for a new one, and everything remained the same. Then I changed the rest (c11,19,18,21 ... etc) and it keeps telling me the same error. Any idea what the fault may be? I inherited the keyboard. my father used it to work, and when he died it was me. It was a while without being used and when I turned it on it said that error. I had the programs but did not emit sound. I changed the battery and it was reset and I could not remove that low battery message.
Please confirm that you are getting 12V, -12V and 5V from the power supply.