First post. I have recently acquired a DE Time Machine and, with the proper coils, the flippers are way too strong due to high voltage at the coils (72 vdc). The wall voltage checks at 118 vac and the voltage from the transformer to BR1 on the PPB is 52 vac, but it jumps to 72 vdc at the + leg of BR1. The capacitor at C1 is within spec as is the resistor at R20. Thoughts? BTW, I have two Williams High Speeds, one of which has the same issue (very high flipper voltage) and the other is fine. Help!

Thanks for the info. That certainly agrees with some other generic research that I did involving rectification, but why would my flippers be so strong (also any other coils at 50vdc such as up-coil to the playfield)? If I play the game as-is, the ramps will be crushed in short order (the coils are Black Beast 22-750/30-2600 per the manual spec). Here is a little more comparative info on all three machines:

DE Time Machine (too powerful): Coil: 72vdc AC to bridge rectifier: 54vac & 54vac DC out from bridge: 72vdc Resistor @ R20: barely warm to touch (not noticeably warm)

Williams HS 1 (plays normally): Coil: 69vdc AC to bridge: 56vac & 52vac DC out from bridge: 69vdc Flipper Board Resistor: warm to touch

Williams HS 2 (too powerful): Coil: 74vdc AC to bridge: 56vac & 54vac DC out from bridge: 74vdc Flipper Board Resistor: noticeably warm; almost, but not quite, hot

What is the purpose of the resistor at R20 on the DE machine? I assume to add a load after rectification (keep in mind I don't know much about this stuff). Is it possible that it is bad (the resistance checks out on my DMM).

Darn. I just purchased the coils, but new ones will be way cheaper than breaking the ramps. It had the Williams FL-11630 coils in it when I got it, but neither flipper was working for various reasons and I made the assumption that they were put in because that's what they had available when it last needed coils. The machine is in super condition but was played without maintenance to the point that the flippers quit and it had some other minor issues. The PF and ramps are excellent, the backglass is perfect and the cabinet is very good (a few nicks on the back box). If it was ever on route, it spent very little time there before it went to an individual's rec room who donated it to a church for their youth rec room. That's where I got it.

Thanks for the info. I'll get over to the DE Time Machine club thread for additional help.

I installed the Williams FL-11630 coils. They work great. Plenty of power but not too strong to break anything.