Opto parts to keep on hand

Keep some infrared LED transmitters (a generic IR LED replaces Williams A-14231) and U-shaped optos such as the QVE11233 used on the flipper opto boards. There are several U-opto types, so match the one you are replacing.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Testing an opto receiver
• Opto styles used in WPC games
• Cleaning dusty optos
• Testing optos in switch edge test
• Checking LM339 comparators on opto boards
• Flipper cabinet opto switch boards
• Checking an under-playfield opto board for bad LM339s
• Where WPC games use opto switches

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