After an aftermarket transmitter/receiver board set was fitted for the five 'egg' targets, none of the targets register. The optos work when the two boards are held very close together, but not at the normal spacing in the target housing.
Egg target optos dead after fitting replacement opto boards: refit original receiver
Cause: The replacement receiver board was at fault; its optos could not detect the beam across the full gap.
Checks
- Use a phone camera to confirm the infrared transmitters are lit.
- Check the 12 V supply to the opto boards and the wiring and solder joints at the boards.
- Swap in the 10-opto board from another game to rule it out.
- Try the original receiver board, fitted with new optos.
Fix
- Refit the original receiver board (with new optos) in place of the replacement one.
Systems
Games
Related tips
- Strange opto and switch faults: the manual swaps J4 and J6 on the opto board
- Mini-playfield hole keeps kicking from power-up: opto wire cut by the elevator
- Bookcase opto still dead after a new receiver: the replacement part was bad
- Opto still dead after replacing both sides: the new transmitter can be bad
- Replacement opto transmitter and receiver pinouts
- Mounting a replacement opto receiver
- Telling an opto transmitter from a receiver
- Opto does not work: check 12 V at the transmitter connector
Source: Pinball Repair help group!! (Facebook group)