second coin the step up coil/switch responds but the corresponding solenoid does nothing. at this point, dropping another coin gets no response until I manually hit the step up solenoid. after pushing in this solenoid then the next coin drop responds with the step up coil/switch.
if this means the second coin causes the coin unit step-up relay to power and stay powered (metal armature plate is held down on the coil top so a third coin doesn't appear to do anything), then:
- the switch on the coin unit step-up relay with orange/green (74-1) and red/black (18-6) wires isn't closing when the relay is powered
- plug connection issue
- coin unit step-up coil is bad. If it doesn't appear burnt, then check for the coil wire being broken off a wire lug