(Topic ID: 289590)

Need debugging help for my Simpsons Kooky Carnival shaker

By Killobyte

1 year ago



Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by ForceFlow
  • Topic is favorited by 1 Pinsider

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sb162.pdf (PDF preview)

#1 1 year ago

I don't have the manual, and am reasonably savvy with working on Sterns of this era, but I've checked all the obvious stuff like fuses and connections. Can anyone recommend a procedure for starting? Test firing does nothing, and I don't mind all the repairs that a working shaker might cause.

#2 1 year ago

Has it ever worked? If not, it's possible that it was intentionally disabled.

I know operators liked to disable the shaker on this game because it caused things to break or shake loose, which caused the machine to go down. They would rather have to open it up and clear off the quarters every once in a while, rather than have the game go down and stop earning because something broke or shook loose.

#3 1 year ago
Quoted from ForceFlow:

Has it ever worked? If not, it's possible that it was intentionally disabled.

Not as long as I've owned it, no. Definitely saw this come up in a few places. It was at least partially disconnected and un-fused but that's been addressed and it's not blowing fuses now, so I was hoping for a theory of "check this, if it's ok, check next thing", etc.

#4 1 year ago

Service bulletin for the coin mech attached below.

Marco has the manual, but I can't seem to find a PDF file for it: https://www.marcospecialties.com/pinball-parts/780-5090-00

sb162.pdf
#5 1 year ago
Quoted from Killobyte:

Not as long as I've owned it, no. Definitely saw this come up in a few places. It was at least partially disconnected and un-fused but that's been addressed and it's not blowing fuses now, so I was hoping for a theory of "check this, if it's ok, check next thing", etc.

Start with voltage at the motor... work backwards. I bet the diagnostics even have the transistors listed.

#6 1 year ago
Quoted from flynnibus:

Start with voltage at the motor... work backwards. I bet the diagnostics even have the transistors listed.

What's an expected value (obviously "not 0"...)?

#7 1 year ago

Couple things to keep in mind; the coil power will be cut off with the front door open, and the shaker doesn't activate during gameplay - it activates after x number of games in attract mode to clear the coins stuck on the playfield.

#8 1 year ago
Quoted from gutz:

Couple things to keep in mind; the coil power will be cut off with the front door open, and the shaker doesn't activate during gameplay - it activates after x number of games in attract mode to clear the coins stuck on the playfield.

Bypassing the door is simple enough, but are you suggesting it doesn't work in the normal test mode?

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