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(Topic ID: 94763)

Black Knight 2000 - all three bumpers don't work - no power.


By creech927

6 years ago



Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 5 years ago by johnwartjr
  • Topic is favorited by 1 Pinsider

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#1 6 years ago

Hi there!

Just picked up a BK2K after being without one for years and truly regretting parting with mine. Anyways, the machine I picked up has an issue where the three bumpers on the upper playfield don't work. I've put the game into test mode and the coil test doesn't fire any of the three. I restarted test mode and checked for voltage at the coil and didn't find any voltage. (I also tried grounding out the tab of Q8 to test the AC switch). I've pulled all fuses and checked, 0.00ohms on each fuse.

What else should I be checking? Every other coil seem to work. Just not all three bumpers.

(Side note, when I first picked up the game, two of the three bumpers would work, and one was locked on whenever the game was playing. that lasted about a day, then none of them worked, not even the previous locked on one, which is now just dead.)

Thanks!

-Greg

#2 6 years ago

Check their fuses under the upper playfield ?

LTG : )™

#3 6 years ago

Doh! Hidden fuse was hidden! Thank you.

Now I've got that out of the way, I've got one stuck bumper to deal with. I'm assuming it's a stuck driver transistor. Should I just replace the TIP122 at Q75, or is there more to it? I've seen others reference a diode that needs to be replaced when the driver transistor is replaced. Do you know what diode that may be?

7 months later
#4 5 years ago
Quoted from LTG:

Check their fuses under the upper playfield ?
LTG : )™

+1 for checking that fuse. Had the same problem with mine.

#5 5 years ago

Test the transistor. If it is bad, replace the transistor and pre driver.

Be careful when you power it back up the first time. If it locks on, you've probably got a bad 7402 as well.

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