I checked the d1 diode on the f14 tomcat flipper board and it reads continuity in both directions. Thats not right is it?
I was gonna say, they should test and only be 1 way, but some parts should be tested out of circuit. Sounds like confirmation above that a diode is fine to test in circuit.
I don't own F-14 so I've only looked at the manual but I don't see a "D1" on either the board layout or the wiring connections in the manual. Of course, Williams manuals are known to have errors in them.
D1 looks like a zero ohm resister/jumper. But I could be mistaken. Test the bridge rectifier just below the blown fuse.A bad bridge would blow it for sure.
Maybe D1 on the board is W1 on the diagram shown above. Seems that it would be there to power all the flippers.
That explains why there is a jumper installed in place of D1.
Williams re-used the PCB of a 'hyperball' motor+coil drive with less and other components for a flipper supply:
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