Stars
Stern Electronics, 1978My 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.
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
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.
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
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.
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Kittery, ME