Setting up free play on EM machines is best done by bridging the credit
wheel zero position switch in the backbox. I believe this is best done by
soldering a jumper in place. If the machine needs to be able to switch from
credit to free play then you will need to run a couple of wires off the
credit unit zero position switch to a switch that can force the circuit
closed. I usually attach the new switch to the backbox panel with screws
and put a label on it indicating freeplay ON <----> OFF.
To verify which switch on the credit unit is the correct zero position
switch, manually step the unit down to zero. You should see one or two
switches open when the zero position is reached. Place a strip of paper in
one of the switches so it will not conduct when closed. Advance the unit so
it has a few credits on it. Press the Start (credit) button. If nothing
happens then you have identified the switch you need to use. If it starts a
game, then slip the strip of paper in the other switch and try starting a
game again.
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