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Old 12-23-2013, 02:08 PM
tyoho tyoho is offline
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Default Black knight 1980 only one flipper working

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?
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Old 12-23-2013, 07:54 PM
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Check every fuse you can find. It's possible that the flippers can be on multiple fuses.
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Old 12-24-2013, 09:44 AM
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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.
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Old 12-27-2013, 11:08 PM
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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?
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Old 01-08-2014, 03:35 PM
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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.
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Old 01-08-2014, 04:27 PM
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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.
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