@Blake7 it would be useful if you clarify - is it some or all of the playfield GI string out?
Moonbus suggestion above has reminded me that I had all pf GI out based on the TRIAC Optocoupler going bad on the GI Aux Driver board (probably mounted on the BB door). The pic below is from GOLD BALL that has two of these GI flasher circuits for pf and bb (with a separate TRIAC in the cab base for each). I swapped these boards round and the problem moved with it indicating the bad MOC3011 which is the little fella in the middle of the board - easy fix!
I wonder about this GI flasher circuit - do all machines even use it in game (other than self test). GOLD BALL flashes the whole GI (pf and bb) before it ejects the Gold pinball - this is to great effect and always makes me smile.
Moonbus suggestion above has reminded me that I had all pf GI out based on the TRIAC Optocoupler going bad on the GI Aux Driver board (probably mounted on the BB door). The pic below is from GOLD BALL that has two of these GI flasher circuits for pf and bb (with a separate TRIAC in the cab base for each). I swapped these boards round and the problem moved with it indicating the bad MOC3011 which is the little fella in the middle of the board - easy fix!
I wonder about this GI flasher circuit - do all machines even use it in game (other than self test). GOLD BALL flashes the whole GI (pf and bb) before it ejects the Gold pinball - this is to great effect and always makes me smile.