(Topic ID: 234899)

My 1st GTB system1 - HELLLLPPPPP! :)

By DropTarget

8 months ago

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  • 56 posts
  • 10 Pinsiders participating
  • Latest reply 8 months ago by DropTarget
  • Topic is favorited by 4 Pinsiders


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There are 56 posts in this topic. You are on page 2 of 2.
#51 8 months ago
Quoted from DropTarget:

Well, It's not exactly working, But the displays power up.
I cleaned and neutralized the CPU. I re-pinned A2J1.
I was still not getting high voltage, and now the +5V output was intermittent. Then I noticed that pin 7 on the input header was pushed in about an 1/8th of an inch. I pulled it out, and voilÀ.
I had given up and ordered a new Power supply, then figured this out about 5 10 minutes later. I went to cancel the new power supply, but tit had already shipped. I'm trying to decide to put in the replacement or keep the game original. I guess I'll keep it original if the CPU is good. If I have to replace it, I may as well replay both.
I won't get around to re-pinning the other connectors until sometime next week.
Stay tuned, and thanks for the support/help.

Power supply board, or transformer? The cost of the new power board isn't too bad. You probably would want to rebuild the old one anyway. IMO sys1 can have a finicky power board, so it isn't a bad idea to use the new one...unless you would rebuild the old.

#52 8 months ago


The latest issues are one locked on coil (yellow drop target reset coil), and no flippers, pop bumper or kickout hole.

I'll check game over relay and get to re-pin early next week then see what happens.

#53 8 months ago

The locked on coil could be a fried transistor, but my money is on the connectors. Same with the kickout hole.

The flippers and pop bumpers are controlled through the "Game Over" relay. But so are the slingshots. So if the slings are actually working, then there might be individual problems with your flippers and pops.

If all three are out, then I'd scrutinize the Game Over relay.

#54 8 months ago

Thanks, yes all three are out. And I suspect Q29, but will know for sure after re-pinning.

#55 8 months ago

F********K, I think the locking linkage came off of the lock cylinder. I cant get the back box open again! It's always something.

#56 8 months ago

Got it.

This game is fighting back! BTW, nice glass, huh?
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