Black Knight 2000 (from Hell)

You need to test transistors 73, 75 and 77 with a multimeter in diode mode. You should remove the pcb to do this but you can test them from the connectors. It's just easier to test them directly at the legs with the board in your lap. Everything you need to know is here. https://techniek.flipperwinkel.nl/wms11/index1.htm

This is an amazing resource! Thank you very much for sharing. I'll definitely use this.
 
Do you have a contact adjustment tool? The switches may just need to be tweaked in.
 
judging by how none of them are working, I would've been inclined to say they share a common control chip in the special solenoids section, but they're 2 different chips U45 (Q73, Q75) and U50 (Q77)

if you haven't done so already you can test the switch inputs by pressing the middle Auto Up switch on the test panel to Manual Down and then press Advance to enter test mode, then return the middle switch back to Auto Up position and use Advance to progress through the tests until you reach Switch Edges. press on the pop bumper saucers and see if they register. if they don't then you'll need to check the wiring. all the pop bumpers share column 3 green-orange wiring, you could have a wiring break somewhere else in the playfield that's interrupting the pop bumper connections with the MPU. if the slingshots work then continuity test the green-orange wires to the pop bumpers against the green-orange wires on left or right slingshots.

the switch matrix should be inside the back cover of the manual if you're unfamiliar with it. all the 64 possible switches in the game have combinations of 8 row and 8 column wires that the MPU interprets. it makes total sense the pop bumpers and slingshots are on the same column because they're all special solenoids which means they're fast action because of the scoring potential.

if the pop bumper switches do register then you'll have a power issue. the solenoid table should be on the inside of the front cover of the manual, you'll see the 5 special solenoids grouped together toward the bottom. all they really share in common is the same plug on the MPU. it's been awhile since I've mucked with a System 11 game or a Black Knight 2000 in particular so I don't remember how the wires are run but they should have a common power wire. since they're on the upper playfield it's entirely plausible you have a wire break. I think System 11 you can measure power at the coils directly but I wouldn't recommend it unless you hook up alligator clips with the game off. I work with a multitude of different generation games and I can't remember the differences between them now lol

hopefully it's just something dumb like a break in the green-orange wire. I'm curious what you come up with. Black Knight 2000 is my favorite game I hope you can fix it.
 
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