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It sounds like this project machine has multiple issues and might not have worked correctly for years. Here's what I do when getting an EM machine in for repairs, or one of mine that did not have a good look over in a while. I feel there is no point in spending any troubleshooting time until...

As Luch stated, this is typically an issue with the low-power hold coil wiring (opened) on that fluttering flipper. Did the issue just start, or you recently purchased the machine with this issue already present? If you are absolutely certain that the lower right flipper coil is good: - Is it...

Sold and gone. Thank you

Bump

For Sale: 1979 Game Plan Sharpshooter pinball machine. New rubber rings, some new bulbs, new off-board battery, few new capacitors, new leg levelers, new pinball. Works very well, although it kicks the ball on initial power-up just like this old rgp post...

Could be a bad bridge rectifier, diode, capacitor, regulator transistor or other component(s) on the power supply, or could be what is connected to the 5V output on the power supply via connector CN6 (MPU, others?) that has a short. Would the F1 7A SB fuse still blow with connector CN6...

Just curious, did you have a chance to troubleshoot and fix the root-cause of this melted coil ? A melted / burned coil in those games is often an indication of an associated shorted drive transistor, and possibly an overfused F5 fuse on the power supply. So a new replacement coil will burn...

In addition to the Slam switch mod link provided above, check that your power supply's +5V output is properly adjusted and not too low. Measure with a DMM on the Volts DC scale on the MPU. Often the trim pot gets intermittent/dirty with the years too. I typically measure across both...

I usually order Molex pins from Great Plains Electronics in the USA https://www.greatplainselectronics.com/categories.asp?cat=46 Digikey might have something similar here in Canada, unsure.

Nice, congrats! Very close to Cows and Boom Burger on Milky Way. There should be more tourists this year, you should do well !

Typically this issue is usually related to opened switch contacts, corroded contacts in the connector housing for switches connecting to the MPU, a bad switch matrix diode harness/wiring disconnected or incorrectly previously fixed, or a bad chip on the MPU. Since you indicated you checked all...

The game Instruction Booklet has a table of those solenoids, connectors and drive transistors. For Solenoid 07 Lower Eject Hole, the associated drive transistor is Q27 and connector is 8P3 pin 7: I use a small trick to identify the location of a non-working coil's issue by: - Using the game...

The connector appears to be a Molex 0.156. A similar post can be found here: https://www.pinballrevolution.com/threads/molex-connectors-for-williams.11820/ I bought many Molex pins & connectors from Great Plains Electronics in the past, great parts & service. With regards to the lower ball...

The displays strobing all 0 on power-up is a good indication of the slam switch permanently opened. I cannot recall what the displays show when a slam (not a tilt) switch opens during a game - the game reboots for sure. I would still perform the slam mod to be sure if I were you. Next: How well...

For your next issue - sounds like the Slam switch opens or is seen as opened intermittently by the machine. Lots of info on the web on how to fix and/or adjust this (switch itself contacts pressure; finger connector/pins for cabinet switches connector on MPU). There is also a mod available...

If the coil sleeve cleaning as suggested by luch above does not help, The reset solenoid assembly for the drop targets can have its position adjusted via two screws on the drop target assembly cage. Easy to do with the machine unplugged, adjust the coil reset assembly so that it just clicks-in...

I see - house power goes down briefly during flipping. Similar as when a refrigerator compressor starts, lights dim briefly, because of quick high current demand. Changing the pinball machine's line filter will not fix dimming house lights, but feel free to try it. I could be wrong. The UPS has...

From the description of the issues, it does not appear this part is the culprit. No point replacing it in my experience. As mentioned by necro_nemesis above, most Williams pinball machines from that era have a loud short buzz at power-up. Design limitation it seems, as I have observed that the...

This part fails very rarely in pinball machines. Just curious, what issue are you trying to solve by replacing that part?

The prior owner or tech did not re-assemble the power supply correctly. The two 'transistors' sticking out (one is actually a voltage regulator) must NOT be electrically connected to the metal plate, that is why there is a mica isolator under each. The metal plate is used as a heat-sink...