This one has me a bit baffled. Replaced PPB relay, disassembled/cleaned ball launch assembly, and replaced BR1 and C1 on the PPB, but ball is not getting up launch ramp about 50% of the time.

50V line is 71VDC normally, and gets as low as 41VDC when firing launch coil.

I even tried firing the coil directly (grounding drive line) and no improvement.

Also noticed some issues with the 6 ball assy lockout in the trough. Took it apart, cleaned, and lubed metal pivot points but it sometimes doesn't completely actuate the assembly. Much less often than the launch issue, but maybe they are related?

Bumpity

Cool, will do, thanks!

Yes, I put in a new coil sleeve and cleaned the plunger. I'll check the ramp, connection, and last resort unwind the coil.

Thanks again!

Worked on it more last night, new symptom - other coils weak also. Some HV coils (flipper, auto launch) and LV coils (upper left saucer kick out, shooter lane feeder) are weak. I've already rebuilt the HV solenoid supply on the PPB (BR and filter cap), haven't touched the LV solenoid supply.

I found a 2.5 ohm resistance on the 0.25A SB fuse for F7 (mains fuse) on the PSU, replaced it, no changes.

Bad connector? Rebuild LV solenoid supply?

Coil strength set to High. Will check xfmr connections and other connections upstream of PPB.