Trough roller switch diodes get crushed

Every trough roller switch carries a diode. Bringing the playfield down from its raised service position can catch these diodes and bend, crush or short them. Check them when trough switches misbehave.

Systems

• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Games

• Batman Forever
• Baywatch
• Guns N' Roses
• Jurassic Park
• Last Action Hero
• Mary Shelley's Frankenstein
• Maverick
• Tales from the Crypt
• The Who's Tommy Pinball Wizard
• WWF Royal Rumble

Related tips

• "Ball missing" errors or extra balls served (roller switch trough)
• Ball trough optos from Baywatch on
• Ball ends early for no reason: missing switch diodes on the ramp switches
• Which Sega games use optical switches
• Flipper EOS switch role from Jurassic Park on
• Three-ball troughs on early Data East games
• Phantom drain on every left ramp shot: two wires fused inside heat-shrink
• Upper flipper dead and its flipper board LED never lights: dirty cabinet button switch

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)