The volume and diagnostic buttons on the coin door all do nothing.

White Water: none of the coin door buttons work

Cause: A break in the ground wire daisy chained between the four buttons, or loss of the +12 V digital supply the electronic buttons need.

Checks

• Check the shared ground wire between the buttons.
• Check fuses F114 and F115 and that the red 12 V LED on the power driver board is lit.

Fix

• Repair the ground wire or restore the 12 V supply.

Systems

• WPC Fliptronics

Games

• White Water

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)