Working on a Eight Ball Deluxe and a string of switches (marked I0 in the manual) will not register as being hit or dropped.

Checked the switches physically and they are making contact, wiring is good, checked continuity all the way to the CPU and that is ok.

Checked the diodes and capacitors on each switch and there are no shorts or broken connections.

Re-pinned connectors J2 and J3, no change. Temporarily installed an Alltek CPU and also no change.

Voltage at the switches reads around 2.5v-3v. When switch makes contact, there is barely a difference in voltage.

All the other targets are working perfectly. Is there something I'm missing, something obvious that I'm not checking?

Please help!

Thanks

EBD solenoid and switch locations.pdf

EBD playfield wiring diagram.pdf

No I didn't but the switch test didn't show that switch to be closed. It also doesn't show the other switches closed either. I'll check it anyway when I go back to the customer's house.

Thanks