(Topic ID: 271962)

Eight Ball Deluxe awarding extra ball on start of game scoring


By Magicman

12 days ago



Topic Stats

  • 7 posts
  • 2 Pinsiders participating
  • Latest reply 11 days ago by Magicman
  • Topic is favorited by 1 Pinsider

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#1 12 days ago

As stated in the subject line, my EBD has started awarding an extra ball for each and every game/player after first plunge of game. There are only two possibilities on initial plunge: Lane A or lane B. Either lane awards an extra ball. I've examined the underside of the playfield, and I see no switch or solder issues. I'm thinking this is a problem on one of the chips on the MPU, but I don't know how to track it down. Oddly, this only happens on the first ball of every game, so effectively the 5 ball game becomes a 6 ball game. As I'm not that great of a player, I probably shouldn't complain, but I'd like to make this as it should be. Thanks for any advice, and I apologize if this has been addressed elsewhere, and I simply couldn't find the topic in my search.

#2 12 days ago

My first thought is one of the replay score levels is erroneously set to a very low value and your machine is set to award extra ball (novelty?) at the 3 score levels. To test my theory, take the glass off and start a game. Touch the slingshots or a 10 point rebound repeatedly, and watch for the score level the game awards an extra ball.

#3 12 days ago

A bad switch won't cause this. If there was a program problem, the mpu would not pass checksum of the eproms and would not start. An extra ball is awarded by the software program meeting certain conditions. If all else fails, take the battery out for a while and reset to factory defaults. Assuming you don't have as alltek board.

#4 11 days ago
Quoted from Meteor_Rick:

My first thought is one of the replay score levels is erroneously set to a very low value and your machine is set to award extra ball (novelty?) at the 3 score levels. To test my theory, take the glass off and start a game. Touch the slingshots or a 10 point rebound repeatedly, and watch for the score level the game awards an extra ball.

Rick, you nailed it. I checked the replay settings and found the following: Replay 1 set at 1,000; Replay 2 set a 1,600; Replay 3 set at 7. Seven! I'm not sure how this happened. I set the levels for replay 1 and replay 2. It should have read "0" for replay 3. I reset it to "0" and the problem is fixed (wow, I miss that 6th ball!) I have no idea how this happened, but the game does some weird things from time to time. The battery has been replaced by an NV RAM chip, but it still has the original MPU. Occasionally, the game won't make it through the boot series. Power cycling another time usually works. Also, on occasion, during a game the machine will just cease play - game over. One more quirky thing, occasionally, during play, the game will sound the slam tilt alarm ending the game, but not legitimately so. I've checked the slam tilt mechs, and it appears to be a false switch closure, as it would take a lot of roughing to trigger one of the slam tilts, and I don't treat my game that way. These anomalies only happen randomly once in 20 or 30 games, so kind of hard to track down, but could be caused by the same problem that changed my setting for Replay 3 from "0" to "7". Thanks again for the suggestion.

#5 11 days ago

Sometimes the mpu can lose track, jump out of the program and write some crazy data to the nv memory. A dirty 5v supply could do that too. If the main cap hasn't been replaced in 10 years, do it. I would pry up the CPU and PIA chips partway (the 3 big ones) and reseat them. Wouldn't hurt to reseat the ram and eproms too. You may have a bad switch diode or a switch on the playfield touching a lamp wire causing the slam tilt. 8BD and flash Gordon are good at that since things are very crammed. Start by looking at the matrix schematic and find the slam tilt switch. Check every switch closely on the same row and column that one is on. Random things are sometimes very hard to find. You could disconnect a row or column at a time at the mpu board connector. Play the game, though some features may not work and see if you can get the symptom to go away. If you find one, then break the row or column in the middle at a switch and try to isolate.

Again, strange things can be caused by one of the 2 PIA chips having a bad socket or connection. I would bet an alltek board fixes all of your issues. These mpu boards are 40 years old now and werent designed to last forever.

#6 11 days ago

Counting the flashes on the MPU when it fails to boot would be a big help in isolating the cause.

#7 11 days ago
Quoted from Meteor_Rick:

Counting the flashes on the MPU when it fails to boot would be a big help in isolating the cause.

Thanks for the input. All very helpful. I remember reading about what the MPU flashes mean (though it's been a while since I've looked over Clay's repair guides). I'd have to dig a little to find which flash means exactly what, but I'm sure I can find that info. Yes, I could remove the backglass and open the lamp panel before turning on the game each time and try to catch it failing, but since this only happens occasionally, and it's kind of hard to access in my line-up, it's somewhat of a pain to do so. Other option would be to just leave the backglass off, but that's somewhat blinding during play (I know, enough of the whining). All of your suggestions are good. I'll look at re-seating the chips you mentioned, and check the 5V power and the Cap. I was going to send the MPU off to Clyde at the Coin-Op Cauldron for a re-work, but he stays pretty busy and I haven't been able to reach him. He does good work and has rebuilt several boards for me in years past. Other option - easier, but most expensive - would be to replace the MPU as you suggest. I've heard several people saying they prefer the Weebly board over the Alltek. I'll look into that as well. Thanks again!

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