1090 machines are electrically stepped.
if you play one coin and and after a payout:
1] have the wipers on the payout counter unit moved, or are the still at reset (around 6:00 on the disc)?
2] does the win meter do anything?
since the payout counter, hopper and coin unit are in different places, there's plug connections between them.
my docs say the schematic, payout counter and reel wiper wiring is the same as the 1090-1 (see
https://bingo.cdyn.com/slots/). Your glass, reel tapes and slotted metal index discs are different ... assuming you have all those pieces from the Barbary Coast casino.
the circuit you care about is about 16 on the schematic ... wire 60-1 down to the payout counter step-up coil.
if the win meter isn't working, check the payout relay switch and plug connections first since the hopper pulse switches (operated by the roller pivot arm the coin lifts as it exits the hopper) are redundant, so unlikely both need clean/adjust ... tho it's possible if the mounting bracket got loose it shifted so neither switch is closing.
if the win meter is working, then most likely thing is a poor wiper->rivet connection on the coin unit. Also check for burn marks on the plug connection to the top compartment and verify the payout counter step-up coil isn't bad.
if ya get bored, please email highest possible resolution pictures to slotpics@cdyn.com or stick them on a cloud drive/file sharing site someplace and I'll add them to the above site. See the
https://bingo.cdyn.com/slots/1114/pics folder for example of what's nice to have pictures of.