Fitting new trough optos on D&D and Blackwater 100

When fitting new trough optos, put a dab of silicone behind each emitter and receiver and stand it a little off the board, so vibration does not break it later.

Systems

• Bally 6803

Games

• Blackwater 100
• Dungeons & Dragons

Related tips

• Stop trough optos from breaking with vibration
• Dungeons & Dragons and Blackwater 100 use trough optos
• Test trough emitters and receivers
• Get at the trough opto boards for testing
• NTE replacement emitters fit the opposite way round
• Blackwater 100 has its transformer in the cabinet
• Trough opto numbering is backwards

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)