My pinball has developed a couple of faults - one is a loose wire, somewhere under here:
Its an intermittent fault, that stops the power ball being recognised. Thankfully the machine can still operate with quite a few faults, you just get an indication that something is wrong by the credit/free play being followed by a full stop. Pressing a button inside the coin door will report what
The other is a bit more serious, the display control board is failing, resulting in a partially corrupt display - the board will need to be sent away for repair.