Williams Solved Black Knight (Williams, 1980) only one flipper working

[tyoho]

I'm trying to get my Black Knight running again after about 10 years in my basement.
It was flaky when I put it away while we remodeled, so when I decided to bring it back, I swapped out the MPU and driver boards for a new combo unit from Rotten Dog.
After wiggling a few connections, I got it to boot up and everything seems to work, apart from a few bulbs and dirty contacts, except only the upper right flipper works. The lower right flipper is trying (slightly) and both left flippers are dead.
I've tried re-seating wires in the connectors. I haven't checked to see if there is current at the coils yet because I'm not exactly sure where I should check and how much I should be seeing.
Anyone got some tips or suggestions to try?

 

[Itchigo]

Check every fuse you can find. It's possible that the flippers can be on multiple fuses.

 

[tyoho]

Unfortunately didn't find any extra fuses.
I found a Jungle Lord schematic which is supposed to be very similar and it looks like I should have 28v to the flippers. I haven't cot a chance to check it yet, and I still not 100% sure how either.

 

[tyoho]

The problem ended up being the end of stroke contacts.
Now I have a different problem. all the playfield lights except the general illumination are out. Everything else works and I checked all the fuses, are there any other usual issues that might cause that?

 

[tyoho]

Play field lights ended up being a bad rectifier, easy fix.
Just got some flipper rebuild kits today. hope I don't screw anything else up in the process.

 

[pinballdaveh]

congrats on finding the problem. i was thinking it might be a rectifier or its connections. your lucky the rectifier went open instead of shorted. a shorted primary on the rectifier is a direct short on the secondary of the transformer. check out my bridge rectifier fusing post on page 2.