Cleaning optical switches

Wipe the lens of the emitter and the receiver LED with a cotton swab dampened with window cleaner.

Systems

• Data East/Sega CPU Version 3b

Related tips

• How Sega optical switches behave
• An optical switch does not respond
• An opto shows closed all the time

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