Gottlieb sys80b (Spring Break). From what I've read, I understand and agree that when replacing a solenoid coil, it is best to use the exact replacement when possible. BUT...
On SB, there are two particular coils. Same coil, A-1496. Same function, one is the main ball launcher and the other is the kicker for exiting the "mini/upper" pf. The first should be able to launch the ball around a mini loop, the other should be able to launch the ball up to the top rollovers. On mine, they only do it maybe 75% of the time.
I've THOROUGHLY cleaned the mechanism assemblies, I replaced the sleeves, I made sure all the assembly parts lined up straight and even, I corrected where there was a deep groove in the wood by the triggering switches, I waxed the lanes. Still, not consistently making it up and out.
These two coils are on the same fuse and are the only two things on their fuse. What would happen if I replace them with stronger coils? Let's say for example Gottlieb's strongest coil for sys80's, the "super flipper" A20095. It has way less resistance so I assume I would need to put in the same value fuse the flippers use.
1) Would this do damage to the driver board transistors that power these two coils?
2) If the A20095 are just too strong for this application, what other substitute would work?
3) Or does anyone have experience with the old "just take X number of wire turns off the coil (thus creating less resistance/more drawing power) and solder it back to the lead" method?
IDK what else to do. Took the DMM to the two A-1496's and they read the correct resistance so I wouldn't say the coils themselves are bad..