GTB North Star Score Motor/Relay Bank Issue?


By spiroagnew

9 months ago


Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 9 months ago by spiroagnew
  • No one calls this topic a favorite

Find

Search this topic for posts matching certain words or written by a specific Pinsider. Or both!




Linked Games



Topic Gallery

There have been 2 images uploaded to this topic. (View topic image gallery).

Pinball (resized).png
Pinball (resized).png


#1 9 months ago

Intermittent problem on my North Star finally became mittent (?). Blessing, as it can now be fixed permanently, right?

Score reels reset to zero. But score motor runs indefinitely. One relay bank indefinitely fires while the score motor runs. The second relay bank, which houses the start relay refuses to fire at all. Coil and fuse check good. Previously, if I just waited, the game would finally "catch", drop the balls and start a game after the score motor and the relay bank fired a handful of times.

I found that if I activate that second relay bank coil manually, the balls will drop, and a game will start. Everything will score in this state except the two bottom rollovers near the flippers. Game will never reach game over though.

Excerpts of the schematic can be posted post haste. I need a little help with the logic of following the circuit and which contact to check.

Thanks in advance EM folks.

#2 9 months ago

Here's the circuit that resets your relay banks. Be very careful and you should probably unplug the machine while working on it because this circuit runs on the full 120 volt line.

Pinball (resized).png

#3 9 months ago

Thanks to Howard, I found the NC switch on DB that wasn't making. It now closes properly and was probably the switch that was flaky all along.

But now, when I push the replay button to start a game, the SB start relay engages, but nothing else happens.  If I manually turn the score motor the game starts and plays fine.

#4 9 months ago

Here's the circuit that runs the motor, along with the switches most likely out of adjustment.

Pinball (resized).png

#5 9 months ago

Right again, Howard. Make/Break on SB wasn't making the proper connection. When pressing down on the SB actuator after it was engaged it would make the contact, and start a game...one a minor adjustment set it right. North Star is happy again.

Big thanks to @howardr

Promoted items from the Pinside Marketplace
1,075
Machine - For Sale
Alexandria, VA
$ 6.00
$ 15.00
Electronics
Yorktown Parts and Equip
From: $ 8,500.00
Pinball Machine
Operation Pinball
$ 60.00
Playfield - Toys/Add-ons
Docquest Pinball Mods
$ 69.99
Playfield - Toys/Add-ons
Lighted Pinball Mods
$ 9.99
Eproms
Matt's Basement Arcade
From: $ 19.50
Apparel - Unisex
ArcadeMade
$ 14.00
Cabinet - Decals
ModFather Pinball Mods
$ 259.99
$ 5,699.00
$ 18.00
Playfield - Toys/Add-ons
Meph's Mods
$ 21.95
Apparel - Unisex
Pinball Wheezer
$ 59.99
€ 85.00
Boards
FLIPPROJETS
$ 75.00
Playfield - Other
Great American Pinball
$ 76.95
Cabinet - Shooter Rods
Super Skill Shot Shop
From: $ 6.00
Playfield - Toys/Add-ons
ModFather Pinball Mods
From: $ 9.99
Eproms
Matt's Basement Arcade
$ 445.00
Cabinet - Armor And Blades
MI Pinball Refinery
$ 49.99
Lighting - Led
PinballBulbs
$ 49.00

Reply

Note: This is an old thread. The last post was made to it 298 days ago. Resurrecting old threads is not necessarily a bad thing, if you think the topic is still relevant and/or your post is beneficial to it (e.g. following up on something). In other cases, it might be better to create a new topic.

Wanna join the discussion? Sign up for a Pinside account, or log in if you already have an account.


Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside