(Topic ID: 251282)

Black Knight: Upper flippers won’t fire

By kevinclark

10 months ago

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  • 8 posts
  • 4 Pinsiders participating
  • Latest reply 10 months ago by LTG
  • No one calls this topic a favorite


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#1 10 months ago

Hi again. I’ve got my Black Knight nearly playable - last hurdle is that the upper flippers aren’t firing. Lowers seem fine. I know I read something about testing coils by shorting something to ground, but when I search I’m just coming up with posts on how to rebuild flippers. Can someone point me in the right direction?

Much appreciated!

Edit: Also, meta point - if I have multiple issues is the etiquette to post multiple topics or to do one thread per machine? The former seems better for search but maybe too chatty? F.e - it looks like the 5T5002 rom on the speech board might be bad (all those words are missing from the self test and pushing on it doesn’t resolve it). Should I cover that here or post again?

#2 10 months ago

Briefly touch a grounded wire to the non-banded side of the diode on the coil to test that the coil fires.

If that checks okay, make sure both sets of contacts on the flipper buttons are closing. Each flipper button has two sets of contacts, one for lower and one for upper.

Download the manual from IPDB and look at page 23 for the flipper wiring. A couple of connectors involved, so make sure they are all seated well.

#3 10 months ago

Thank you! I have both coils weakly firing from the flipper. Probably need to do a lot of cleaning and maybe a rebuild, but they’re functioning. The coils worked when I shorted them and it looks like it’s just badly oxidized switches in the flippers.

#4 10 months ago

Oh - to clarify - this article suggests all early solid state flipper contacts are tungsten and the way to clean them is with a metal file: http://homepinballrepair.com/index.php/pinball-switches-fixing-adjusting/

Is that true for Black Knight? The contacts are pretty brutalized and I don’t want to make them worse by using the wrong technique.

1FA6ACB2-1742-46C9-8B55-9E65BED9CEBB (resized).jpeg
#5 10 months ago
Quoted from kevinclark:

Is that true for Black Knight?

Yes. File them.

EOS too, and be sure plenty of tension holding them closed.

LTG : )

#6 10 months ago

I too had a problem with the flippers on my BK when first firing it up and it was dirty/oxidized/corroded cabinet switch contacts. Cleaned them up and they have been working ever since!

#7 10 months ago

Looks like it was a combination of corrosion and badly adjusted switches. I tweaked them so they make better contact (while I wait for a flexstone to come in) and now the game is playable. Flippers are a little weak, but functioning.

#8 10 months ago
Quoted from kevinclark:

(while I wait for a flexstone to come in)

Jewelers file works better for this.

LTG : )

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