The game showed a factory reset message on power-up and the coin door buttons can't get into the audits or tests.

Coin door test buttons do nothing: broken ground wire at the memory protect switch

Cause: The white ground wire to the coin door memory protect switch was broken. The single diode in that circuit also belongs only on the high score reset switch.

Checks

• Check continuity from each coin door switch back to its connector, including the white ground wire.
• Check the memory protect switch reads closed with the door shut and open with it open.

Fix

• Repair the broken ground wire; put the diode back on the high score reset switch only.

Systems

• Williams System 11A

Games

• Pinbot

Related tips

• Whole game flickers off and on, then dies: burnt ground pin at the power supply board

Source: Pinball Repair help group!! (Facebook group)