(Topic ID: 240787)

DE Star Wars Trough Eject Coil continuously fires


By toberlindacher

9 days ago



Topic Stats

  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 8 days ago by toberlindacher
  • No one calls this topic a favorite

You

Linked Games

#1 9 days ago

I'm looking at a friends DE Star wars and the trough eject coil continuously fires when powered on. He found that the coil leads had melted/broken off and so he ordered a replacement coil and powered it on. Same problem. A fuse blew and was replaced and then he swapped the coil wires and turned it back on (yikes).

So, when I checked, i found Q45 was bad which is consistent with the manual. I replaced Q45 and then fired the game up but the trough eject coil still continuously fires. I re-tested Q45 and it needed to be replaced again.

So, my question is what other components on the pcb's should I be testing/replacing. Looking at the schematic, I see the other components that are on the PPB related to this are D2, D10 and R2. Isn't there another transistor on the PPB I should be looking at. Is there a pre-driver transistor? Any other components to check on the CPU pcb?

I've been looking at the following manual on page 33 of the pdf (Page 29 of the actual manual)

https://www.ipdb.org/files/2358/Data_East_1992_Star_Wars_Manual.pdf

I measured the coil and it tests fine and also replaced the diode on the coil.

I am not that familiar with DE games and so any help is much appreciated.

#2 8 days ago

Bump for the 15th

#3 8 days ago

I wish I could help, I'm following because I have a DE JP that I had a similar issue during game play (it ended up being the shooter lane eject switch). I also would have suspected Q45 (which I think I also replaced on mine). Good luck, here's a post hoping someone else sees it.

#4 8 days ago

Did you verify the new coil is wired correctly? Brown wire should be on the banded side of the diode according to the schematic.

I think you may have missed the other pdf for the schematics over at ipdb.org. I guess they made a separate document for higher res photos or whatever. Here's the link to the pdf:

https://www.ipdb.org/files/2358/Data_East_1992_Star_Wars_Schematic_Diagrams_English_Manual_pages_46_69.pdf

Go to page 55, "CPU schematic page 3 of 4" and you'll find the rest of the solenoid circuit on the cpu board. Note there's a resistor pack between the driver and predriver that may be faulty as well.

These problems can be hard to tackle on DE games for whatever reason. I'd do all transistors and diodes in that circuit and the resistor pack for good measure if i were to try to shotgun the repair. It sucks because if you don't replace all the bad parts at the same time, the remaining bad ones can sometimes knock out the new ones you just installed.

That's probably about all i can do, but hopefully this will get one of the more seasoned techs' attention so they can properly help troubleshoot this. Good luck!

#5 8 days ago

Thank you very much for your help. I had not seen those schematics yet and those are just somewhat critical I will first check the wiring to the coil as I think he had the two purple wires going to the banded side of the diode and not the brown wire.

I will then test the other parts of the circuit. I appreciate it!

Promoted items from the Pinside Marketplace
From: $ 20.00
Cabinet - Other
Rock Custom Pinball
From: $ 40.00
Lighting - Interactive
Professor Pinball
$ 9.99
Eproms
Matt's Basement Arcade
$ 30.00
Electronics
Yorktown Parts and Equip
From: $ 20.00
Cabinet - Other
Rock Custom Pinball
$ 20.00
Playfield - Decals
Metal-Mods

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