Quoted from Rdoyle1978:So if the LEDs on the plane are constantly lit, doesn’t that indicate a blown transistor?
According to the wiring diagram J118 powers:
- 10 Switch Opto PCB (A-15430)
- 3 Switch Opto PCB (A-13901-2) => Ball lock (idol) optos
- Motor EMI PCB (A-15340) => Ball lock (idol) motor
- Motor Opto Switch PCB (A-16657) => Mini playfield optos
- Bridge Driver PCB (A-15946) => Mini playfield motor
- 3-bank Opto Drop Target PCB (A-13609) => Center drop target optos
- Plane Gun LEDs
The manual is ambiguous about the flipper opto buttons. One part says it's powered by J116 and another states it's powered by J904. I'm not at my IJ so I cannot check how it's wired.
The Plane Gun LEDs are driven by Q32 on the power driver board. Also note that (if I recall correctly) the SAME drive wire (Blu-Gry) is used to drive the Extra Ball button at the front of the cabinet. That flasher get its power from the coin door +12V that is supposed to be J116.
As I've said I'm not at my IJ so I cannot confirm any of this but I do hope this gives you some information that can help you track down where your problem might be. I do have another wiring harness from a disassembled IJ that I can take a look at to verify anything you need. I have to dig it up. It's waiting for playfield restoration.
Folsom, CA
