Replacing trough transmitter and receiver optos
Trough optos break from ball shock and wear; it's almost always the transmitter. Transmitters are on the board nearest the coin door, which is the easier one to reach. Fit a transmitter so its flat side matches the flat on the circle printed on the board. Fit the receiver with its flat edge toward the top edge of the board (in the hole furthest from the drawn notch).
Systems
Related tips
- Bench testing a trough transmitter board
- Opto ball troughs from Indiana Jones on
- Remounting early trough opto boards on grommets
- Telling an opto transmitter from a receiver
- Full ball trough opto test in switch edge test
- World Cup Soccer and later trough opto boards carry only the optos
- Testing an opto receiver
- Replacement opto transmitter and receiver pinouts
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)