All score displays are very dim or dead on Funhouse, Harley Davidson or The Machine.

Alphanumeric WPC games: weak or dead score displays

Cause: The two 39k ohm resistors R48 and R49 on the display board have drifted high or opened.

Checks

• Measure R48 and R49 out of circuit.

Fix

• Replace both with flameproof 39k ohm 1 or 2 watt resistors before buying displays.

The display board carries high voltage; work with the game off and unplugged.

Systems

• WPC Alpha-Numeric

Games

• Funhouse
• Harley Davidson
• The Machine: Bride of Pinbot

Related tips

• Display shows only a few broken left digits after board work: ribbon cable reversed
• Display shows random periods and shaky digits after its ribbon was unplugged
• WPC alphanumeric display board high-voltage checks
• Funhouse: character 16 copies every other character's segments
• Alphanumeric display board numbers
• WPC display and DMD controller board versions
• Alphanumeric display segments or digits missing
• Score display digits dead or dim

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