Quoted from sbmania:Yes to the above. Stop replacing the chip! First try to trigger one of the switches by shorting the appropriate two connector pins on the board with the connectors removed. If you show the correct switch closure in switch test, you have a wiring problem/break between the connector and the playfield. If no switch closure shows, something on the board or its molex pin is bad. Get a meter and start checking continuity from the pin back to the chip.
This. Could also be a poor connection in the IDC connector on the board.
Hanford, CA
Auckland, NZ
