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Monday 30 October 2017 at 17:15
Hi,
For the LEDs on the WPC-95 CPU board:
J202 is the power LED, and should always be on.
J201 is the Blanking indicator, it should light up briefly for power up, then stay off afterwards.
J203 is the DIAG indicator. After switching on, it should flash regularly, indicating the activity of the CPU....
Source: http://pinside.com/pinball/forum/topic/mm-g10-error#post-4047299