is a microswitch activated by the reel 1 wiper arm. When the payout counter steps off the powered trace(s), payout ends. payout happens when a circuit completes thru the reel wiper boards and payout counter to power the payout relay. the payout counter is mechanically stepped by a coin exiting the hopper, and electrically reset the coin relay and handle release relay are electrically tripped and mechanically reset To make complete sense of the schem, you need to know: the EOS switch opens, unpowers the line unit relay and that in turn unpowers the line unit step-up solenoid to step the unit. when the coin switch goes back up, circuit completes thru a different line unit relay switch to power the line unit step-up solenoid coil second+ coins cause the line unit step-up relay to power when the coin switch goes down, and a hold switch on the relay keeps the relay powered until a line unit EOS switch opens. first coin resets stuff and trips coin relay and handle release relay The line unit step-up is a little indirect: probably the line unit not stepping up reliably due to electrical issue, but it could be mechanical. If you're familiar with bally EM pinballs, you won't have any trouble tracking down the issue. Assuming it's really an 873-ZC and not just the model/serial number plate, the paperwork is in
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