Help with switch problem!

[ccarlesco]

I recently bought an Game Plan Old Coney Island pinball table and I'm trying to repair it.

The issue I'm having is with the switch logic on the playfield.  About 1/4 of the switches seem to trigger the incorrect code in test mode.  It seems to be the coin 1,2,3 - tilt and test mode button are registering incorrectly to a variety of different playfield switches - A few playfield switches don't register at all.  If I try to play a game and the ball hits either the test mode trigger the game abruptly ends.

I've examined the wiring carefully and I don't see any obvious shorts.

Any help with this issue would be greatly appreciated!

Chris

[shardian]

Best advice: I hope you have schematics. These issues are annoying as hell, and take forever to troubleshoot. I just dealt with my own frustrating problem. The best and only way to solve it is to roll up the sleeves, and plug n' chug with a DMM in continuity check mode. Start at the board, and follow the schematics all the way to each switch.

Good luck.