Displays light but look dim.

Score displays dim

Cause: Drifted resistors on the display board, tarnished connector or header pins adding resistance, or cracked header joints.

Checks

• Measure the display board resistors.
• Inspect the header and housing pins.

Fix

• Replace off-value resistors, replace tarnished pins, and reflow cracked joints (page 60).

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200

Related tips

• Flickering score displays
• Replace a score display glass
• Bally and Stern score display boards
• One digit missing on a score display
• Score display J1 to MPU J1 connections
• Score display digit parts by position
• Display glass dim, digits missing or slow to light
• All score displays blank with the MPU fully booting

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)