Credit digits stay blank in play but work in display test: DIP switch 20
If the two credit digits light in display test but stay blank in attract mode and during play, the credit display has been switched off in the settings, not failed. On this game MPU DIP switch 20 turns the credit display on or off (some locations didn't allow credits to be shown, so a lamp on the apron is used instead). Turn switch 20 on.
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Source: Pinball Repair help group!! (Facebook group)