(Topic ID: 174394)

First post : pop bumper fires when spinner hit


By spacemonkey555

4 years ago



Topic Stats

  • 17 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by spacemonkey555
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You

Linked Games

  • Galaxy Stern Electronics, 1980

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tmp_27691-IMG_20161127_223645615-1448268148.jpg
SternGalaxySwitchAssignments (resized).jpg
SternGalaxySwitchMatrix (resized).jpg
SternGalaxySwitchTest (resized).jpg
SternGalaxyPlayfieldParts (resized).jpg

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#2 4 years ago

Do you have the schematics?
Looks like those two switches are very close on the playfield. Have you opened it and looked for shorts?

#4 4 years ago

With your machine unplugged, raise the playfield and look at the wires that go to the two areas I've circled in red. If you have a multi-meter, use that to check for continuity between those two switches. You should not find any. If you have continuity there is a short and that's why your pop bumper fires when the spinner activates.

If the number 3 I've circled isn't what's firing with the spinner, look and test for shorts between the spinner and the misbehaving item. Right slingshot maybe, located at P7?

SternGalaxyPlayfieldParts (resized).jpg

#6 4 years ago

If they share a wire it's probably a switch matrix problem. I didn't see a diagram for the matrix in the manual but I might have missed it.

Have a look at the pinwiki on switch matrix issues.
http://www.pinwiki.com/wiki/index.php?title=Bally/Stern#Switch_Matrix

You'll want to figure out which row or column the two switches share and start your troubleshooting there.

#10 4 years ago

I think what Homepin was suggesting was put some paper between the pop bumper switch. If the pop bumper still fires with paper between the switch contacts we'll know it's an electrical problem somewhere and not just a sensitive pop bumper.

Go into the self test #5 (switch test). With ball(s) removed from the game does the test show any switches closed? With the target up, activate the spinner. Does the test show any switches closed now? More than one? (edit: Troubleshooting might be tough. Pinwiki says "NOTE: Multiple closed switches will NOT display anything other than the lowest numbered switch. This can be an issue with various switch matrix diode problems, as the switch displayed as closed may not be the switch with a problem. There is a special test rom available that will show ALL closed switches in a sequence similar to how Williams' machines did so")

Now drop the target and note any switches shown as closed. Activate spinner with target down. Same switches or different than with target up?

Pinwiki shows this for the switch matrix. If I'm reading it correctly #5 is the spin target, 13 is the lower right pop bumper, and 10 is the yellow drop target. 5 & 13 are in the same row on the switch matrix, 10 & 13 are in the same column. Not sure what that means but I'll keep digging. Here is some good reading: http://www.pinwiki.com/wiki/index.php?title=Bally/Stern#Switch_problems

SternGalaxySwitchTest (resized).jpg
SternGalaxySwitchMatrix (resized).jpg

SternGalaxySwitchAssignments (resized).jpg

#11 4 years ago

Also check out this thread about another Stern Galaxy with a switch matrix problem. The same troubleshooting methods will work for you.
https://pinside.com/pinball/forum/topic/stern-galaxy-strange-intermittent-kicker-issue

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