(Topic ID: 231145)

Eight Ball Deluxe- Drop Target Problem


By pindude80

4 months ago



Topic Stats

  • 14 posts
  • 7 Pinsiders participating
  • Latest reply 45 days ago by frunch
  • No one calls this topic a favorite

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#1 4 months ago

I played a few games on my EBD last night. The first few games everything was normal then I started getting weird drop target problems. The first thing I noticed was I knocked down the eight ball target but I didn't get credit for it and the light that was up by the drop target was still lit. Then I noticed I knocked down the 2x target, it didn't light up on the bottom of the playfield and when draining the ball the 2x target didn't come back up, the same happened with the eight ball target where it didn't come back up after a ball drain. I also noticed that when the next ball was served and all of the ball targets were down they would each individually "twitch" but didn't do anything else. I started a new game several times and it would start out by automatically dropping a few of the ball targets even though a ball hadn't been plunged yet.

Any ideas on what the problem is or what I need to look at?

#2 4 months ago

I am guessing connector issues or possibly a chip on the mpu that is getting flakey.

#3 4 months ago

Those are the two things that came to my mind also. I reset the connectors on the mpu board, but no change. Does anyone know if there is any one particular connector that I need to take a close look at?

#5 4 months ago

Thanks for the link! I pulled J4 on the MPU, took a close look, and it's definitely seen better days; pin 5 was literally hanging on by a couple strands. J4 is a 19 pin connector, unfortunately I don't have one of those in my stash so I'm going to order a 19 pin molex connector from Great Plains Electronics and report back when it's done.

#6 4 months ago

just did this repair tonight.
J4 on the MPU was the culprit. I was getting random knocker firing , right sling would make a drop fall, lower pop bumper would make right sling fire, etc. at first i thought it was a cap issue on a switch, but that would not make the knocker fire at random when a switch is hit.

some games played were fine, then start another game and these oddities would happen.
report back after you replace J4 to confirm it fixed your issue.

1 month later
#7 3 months ago

I finally got around to replacing the J4 connector on the MPU board; I converted to a molex connector. After I replaced it I was still having the same problems. I knew pin 5, the yellow wire, is what was giving me my problems before so I moved it around and the game started working properly. Even though it was working properly I didn't want this demon to pop up again later, me forget what the culprit was, and have to start the diagnosing process over again so I cut the wire close to where it came out of the harness, soldered in a new wire, re-connected and so far so good!

Thanks to rcbrown316 for pointing me in the right direction!

1 month later
#8 68 days ago
Quoted from pindude80:

I finally got around to replacing the J4 connector on the MPU board; I converted to a molex connector. After I replaced it I was still having the same problems. I knew pin 5, the yellow wire, is what was giving me my problems before so I moved it around and the game started working properly. Even though it was working properly I didn't want this demon to pop up again later, me forget what the culprit was, and have to start the diagnosing process over again so I cut the wire close to where it came out of the harness, soldered in a new wire, re-connected and so far so good!
Thanks to rcbrown316 for pointing me in the right direction!

No problem man! this was the singlemost aggravating problem I have ever had on a pinball machine. quench solved it for me. I will never forget and always pay it forward..

#9 67 days ago

I recently got my EBD going again after it sat for a year when I gave up trying to figure it out. Was also my most aggravating pin diagnosis ever. I worked thru a bunch of problems and nearly all of them were because of J4 connector issues. Tips from Pinside folks pointed me in the right direction!

#10 65 days ago

yeah those little .100 connectors, and the hacks done to them over the years seems to cause a lot of problems in these older games.

2 weeks later
#11 45 days ago

Unfortunately my problem has returned So, I'm thinking maybe cold solder joint on the J4 pins on MPU board, bad chip, or chip needs re-seated, any thoughts?

#12 45 days ago

Just my two cents - in my experience, if the connector pins are that badly worn, its likely the connector on the boards are just as bad. You can try to clean the pins on the board, but the problems will come back. Changing the connector on the boards are the only way to go. On the plus side of changing the connectors on the board, you also eliminate cold solder joints.

#13 45 days ago

Yeah probably not a bad idea to have the pins changed out and like you said would get rid of cold solder joint concerns at same time. Could it be the chip though?

#14 45 days ago

If you don't want to go to the trouble of removing the connector pins (not sure how comfortable you are with board work), you could try just re-flowing the pins on J4 for the meantime. If it fixes the problem again, then you *know* you'll have to replace the male headers if it should happen yet again.

I also find it easier to remove the headers by re-flowing the pins first anyway, the fresh bit of fresh solder helps make removal easier when you go at it with a desoldering tool.

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