Infrared Transmitter assembly in the white plastic housing.
CALIFORNIA WARNING
This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
This is the infrared Transmitter assembly in the white plastic housing with a green circuit board used on many late model Bally and Williams playfield mechanisms.
Reference:
A-16908
B-79711 is the set of Receiver with housing and Transmitter with housing assemblies.
A-14231 is the WPC System opto transmitter board without the white plastic housing. You can unscrew the bad board from the housing and replace with the A-14231 board.
Select manufacturer to view game compatibility
Infrared receiver assembly in the black plastic housing.

Sheet Metal Screw #4 x 3/8" p-ph

Sheet Metal Screw #4 x 1/2 nch p-ph

Infared LED Opto set Williams/Bally

Bally/Williams WPC system LED-IR diode