Had to do a design modification on the ball walker in Freefall last night.
Due to buggy code, a switch bounce on the up kicker will cause the game to release a ball from the walker prematurely. The game loses track of the 2nd ball and will not play correctly for the remainder of the game.
In my case, I was on 3rd ball and I had a switch bounce on the final up kick to start multiball. It didn’t start multiball like it was supposed to, but instead released two balls in single ball play. After a short time one ball landed back in the up kicker which started multiball, but there were only two balls to release. I can’t remember what happened after that other than one or two balls ended up back in the up kicker and the last ball drained to end the game. The ball walker moved the balls once, which it shouldn’t do, but I didn’t think much about it. A few minutes later I smelled burning related to the ball walker coil being locked on.
This prompted me to re-engineer the ball walker with an EOS system, similar to what I did for Centaur. Here is the original mech and the damage (prior) to the plastic above it:
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Step 1: McGyver a switch mounting bracket from an old coil stop that lost its plug. Position it, drill it and mount it. There is a plastic spacer behind the plunger link that will serve as the switch actuator.
Step 2: Ty-wrap a spare flipper coil to the side of the nearby drop target bank. The hold winding of the coil will be wired in series with the ball walker coil to reduce the current draw after the solenoid pulls in.
Step 3: Move the yellow coil power wires to the hold coil, then wire in the EOS switch (blue wires) and tie the hold coil to the ball walker coil (grey wire). As wired, the EOS switch shorts across the hold coil and takes it out of circuit as long as the EOS switch is closed. This allows full power to the ball walker coil so it can pull in when activated. Once the ball walker pulls in, the EOS switch opens and adds 350 ohms from the hold coil to the circuit, which drops the current from about 1.5 amps to 0.15 amps. At this rate of current it can stay locked on all day and it won’t damage anything.