New! Dark mode!

Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!

(Topic ID: 270458)

Stern Stars blowing 1amp Playfield Fuse - Solved


By ita47

4 months ago



Topic Stats

  • 7 posts
  • 2 Pinsiders participating
  • Latest reply 4 months ago by ita47
  • No one calls this topic a favorite

You

Linked Games

  • Stars Stern Electronics, 1978
#1 4 months ago

My Stern Stars started blew the 1 amp playfield fuse that powers most of the coils. I have checked the resistance of the coils and all check out ok. I don't see any thing obvious under the playfield. I can replace the fuse and the game will start and play the fuse will usually hold for 1 game and then when you start the second game it will blow. Any help would be greatly appreciated.

#2 4 months ago

Is it a slo-blo fuse you are using ?

#3 4 months ago
Quoted from chas10e:

Is it a slo-blo fuse you are using ?

Yes

#4 4 months ago

I was hoping it'd be that easy .... you don't have an alltek SDB you can monitor during start up of 2'nd game to see which coil is drawing to much current on hand do you ?

https://allteksystems.com/products/ultimate-solenoid-driver-board

#5 4 months ago
Quoted from chas10e:

I was hoping it'd be that easy .... you don't have an alltek SDB you can monitor during start up of 2'nd game to see which coil is drawing to much current on hand do you ?
https://allteksystems.com/products/ultimate-solenoid-driver-board

No I have a factory SDB. I have swapped SDB’s and still same issue of blowing the playfield fuse, usually on the second game.

#6 4 months ago

I'm thinking it's be a drop target reset bank coil. ... do they fire even if all the drops are up ?

I dunno if a bad coil diode would cause a fuse to blow or not. not sure what service bulletin #9 is all about either https://www.ipdb.org/machine.cgi?id=2366

#7 4 months ago

chas10e you were right. I found the problem. The diode on the pop bumper was broken on the back side and couldn't be seen. When I wiggled it I could tell it was loose or broken. I removed and replaced it with a new one. Put a new slow blow fuse in and it works again. I played several games with no issues. So yes a bad coil diode can cause the fuse to blow.

chas10e thanks for your help, I really appreciate it.

Promoted items from the Pinside Marketplace
$ 25.00
$ 9.00
Cabinet Parts
Third Coast Pinball
From: $ 15.00
$ 6.00
Cabinet - Other
Siegecraft Electronics
From: $ 18.00
Apparel - Men
Pinside Shop
$ 100.00
Playfield - Protection
Beehive Pinball Co.
From: $ 45.00
Displays
PinballSolutions.eu
From: $ 155.00
Wanted
Machine - Wanted
Warren, MI

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