Quoted from Yokimato:Was playing STTNG and the left flipper will stay up, as long as there’s power. Interlock switch when opening the coin door immediately drops the flipper and, when closing the coin door, it flips back up, staying up.
The flipper assembly is in great condition, no issues observed, all left flipper fuses are fine, no errors in menu. If I disconnect the power to the small PCB that’s posted near left flipper, no flippers flip as expected. That PCB has one red and one green led, can’t recall what normal was — any thoughts or suggestions?
When you first turn your machine on does the flipper go up, if so then 9/10 it's the transistor. If goes up when you start a game then check your EOS switch and EOS capacitor. Also the other thing to check is that the flipper opto interrupter (at the flipper buttons) isn't being stuck open or partially broken and not returning to it proper position
opto board (resized).JPG