(Topic ID: 246418)

Black Knight / system 7 flipper issues

By HeavyMetalBalls

7 months ago

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  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 7 months ago by slochar
  • No one calls this topic a favorite


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#1 7 months ago

Here are 4 videos showing the problems I'm having. Sorry they are little scattered. I was posting them in response to some guys on a Facebook group... u gotta watch them all to get the full idea, they are short, I promise.... Thanks
Video #1

Video #2


Video #4

#3 7 months ago

Put new assemblies on both lowers (the ones giving me problems). The upper flippers could possibly be weak but I don't notice it cause the short shots on the upper playfield.
In vid 4 I have the red lead on my DMM to the coil. If I put the black probe to the ground strap in the backbox it shows 34 volts on the coil. If I put the black probe on the ground strap in the cab I only get about 0.6 to the coil
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#4 7 months ago

I'm noticing a few things with the ground.
These pics are voltage to the coils. Black lead in different spots.
Pic #1 - 34 volts
Pic #2 - 0.7 volts
Pic #3 - 31 volts
Pic #4 - Last pic is backbox ground with red/white wire that's on the magna-save switch shown in pic 3

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#6 7 months ago

Ok, before I do that I wanna get ur opinion on this. I just noticed this ground strap looks like it's been cut... It was impossible to see, I had to use my phone to get a view. I also double checked the solders to the lugs. I even went over them this morning to be sure.

#7 7 months ago

Doing a continuity test with one end on the ground lug of the flipper coil and the other end on the one in the pic gives me 0.483 resistance... I really appreciate u taking time out of ur day to help me. Very cool of u
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#8 7 months ago

Moved the probe from the flipper to the backbox ground and got continuity (3J3 pin 3 to backbox ground)

#9 7 months ago

Connected the ground strap that's shown in the last video to the one in the backbox. I now have 36 volts to my flipper coils. Played a game and the lower flippers are still too weak to make it up any of the 3 ramps.

#10 7 months ago

Looks like I had the wrong coils installed. I was using 50 volt coils. The website I bought them from said for "Williams machines" I guess it meant later Williams. Luckily I had a couple of the correct coils in my stash and now the game is playing great! Thanks

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