Stern pinball machine dual opto transmitter / receiver amplifier board assembly.
Some games may need the position Anode and Cathode for the LED reversed. Pay attention to how your old board is labeled before swapping.
These include the four plastic standoffs the same as the original.
NOTE: these are built using SMD components exactly as the original Stern part however many of the PCB tracks have been beefed up.
Reference: 520-5239-01
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