(Topic ID: 260853)

Bally Black Belt (6803) Almost Booting, Strange Behavior

By sleaziep

2 years ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by wayout440
  • Topic is favorited by 1 Pinsider

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#1 2 years ago

Working on a Bally Black Belt. Forgive me as I don't have much experience working on 6803s. Not mine, but I have seen this pin play recently. It was out on the floor for a while and it was reported to me that either the GI or feature lights went dark. The diagnosis was unclear. It is worth noting that though I don't capture it on the video, some feature lights and some GI do light up on boot sequence. It was wrapped up before I could review any issues and then I brought it home to fix. Anyway, I fire it on, get three flashes from the sound board, nine from the MPU, which is what I am expecting for a successful boot. However, all I get is a repeating trough solenoid firing and a flashing light at the plunger. See video for MPU boot and issue.

Any thoughts? I have reseated everything, put new batteries in (they are off the board and no acid damage), and checked all the fuses.

Here is the video of boot: https://imgur.com/a/b2dXAla

Thanks so much for your help!!!

#2 2 years ago

This would probably qualify as an intermediate repair for someone with experience troubleshooting digital electronic circuits with the proper tools (logic probe/oscilloscope). It could be any number of things, not limited to simply a failed integrated circuit. The ball eject that is pulsing is probably multiplexed with that particular flash lamp. I would probably start by identifying what is happening with the signals at decoder U14, which gets it signals from PIA U7.

#3 2 years ago

Fun stuff! Thanks for the advice. wayout440 is your level of confidence that this will require some significant IC work high? That might be a little beyond my pay grade but I can do light board work, reflow cold solder joints, rebuild molex connectors etc. Does anyone have recommendations per where I may want to start in checking off those types of repairs before I send the board out so I'm not grasping at strands? I don't want to have to jump through that hoop before I am certain that this is the issue.

#4 2 years ago

Update: I have resolved the issue. I don't have a homerun answer, but I just started from scratch. Pulled all molex connectors again, blew everything out, made sure all pins on the boards were extra clean, rebuilt a questionable molex. It was definitely a connection issue somewhere along the way... and as an added bonus, the full GI and feature lights are back. Took a few hours to get everything pristine but it worked. Thanks to wayout440 for taking a crack at helping.

#5 2 years ago
Quoted from sleaziep:

Update: I have resolved the issue. I don't have a homerun answer, but I just started from scratch. Pulled all molex connectors again, blew everything out, made sure all pins on the boards were extra clean, rebuilt a questionable molex. It was definitely a connection issue somewhere along the way... and as an added bonus, the full GI and feature lights are back. Took a few hours to get everything pristine but it worked. Thanks to wayout440 for taking a crack at helping.

Your welcome! glad you got it working. If I had to say one word to help anyone, working on any game ever made in history...to help them, and, I'd be spot on perhaps half the time: Connectors!

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