(Topic ID: 238902)

Bally Eight Ball Acting Odd

By Mistermoberg

5 months ago

Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 5 months ago by wayout440
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#2 5 months ago
Quoted from Mistermoberg:

Alright. So, I picked up a Bally Eight Ball a few weeks back. When I bought it, I was told the MPU was flaky (the board looks HIDEOUS) and that I had the option to buy the game with an Alltek. I declined to buy the Alltek. Three weeks later, game went crazy. Some light sockets refused to turn on, a little later, a chime coil stopped working. Did a power cycle - coils started locking on. Game stayed off, Alltek MPU ordered. Even if that's not the issue here - I should have an Ultimate MPU regardless.
Followed the install instructions exactly, checked for 5 on TP1, came in exactly at 5.25 - on the highest acceptable number, but in acceptable range.
Put in the Alltek, the game did indeed start up, but coils still acting odd, bulbs as well.
What's the next troubleshooting step here? Solenoid Driver? I really appreciate any help.

5.25, I assume volts DC? Measure the AC ripple there to check power supply caps. (This is not likely the cause of your problem, because usually a problem with the logic power will cause random or no boot up, and not cause the game to "go crazy")

Any signs of current or former corrosion around the battery area? This can spread like a disease when poor attempts have been made to clean.

Coils locking on random and other crazy usually points to logic problems, and if the boards have been worked on by someone inexperienced it would have to be gone through with a fine tooth comb. There could be wrong parts, solder shorts, trace damage - you name it. These games are also notorious for needing a LOT of repinning on the header pins and connectors. Go through the service docs for each board one at a time, performing any needed repairs and upgrades (there are a few for this series on each board), repin where necessary and then revisit the situation for advanced troubleshooting.


#5 5 months ago
Quoted from Mistermoberg:

Really appreciate this info. Gonna check the AC (I should have to begin with, will do it tonight or tomorrow morning.) That very well could be my issue. There are times the game won’t start up.

If the power supply doesn't reveal a problem, pay close attention to the cables delivering logic power to the CPU. The connectors need a gas tight fit to deliver good current. Repinning the connects helps a lot. Http://www.pinrepir.com/connect/

#8 5 months ago
Quoted from Mistermoberg:

Okay guys, I measured the AC - it bounced around a lot and then settled at 10.5. It should be at 15, right?

Not sure what you are measuring. AC ripple on the +5VDC logic voltage should be in millivolts (mV) - well under a volt. When dealing with electronics you really need to specify the units of measure.

#10 5 months ago

No need to apologise. Measuring AC ripple is just a check for the quality of your DC power. When you post meaaurements without a unit of measure it makes it difficult for us to interpret what is going on and give correct advice.

#12 5 months ago
Quoted from Mistermoberg:

With my new meter I came in at:
5.26V DC
38mV AC

btw...The numbers are spot-on. You have a healthy power supply Glad you got it running!

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