(Topic ID: 45952)

TECH: Blackout is starting a 2-Player game when start button is pushed once

By ChadH

6 years ago

Topic Stats

  • 14 posts
  • 8 Pinsiders participating
  • Latest reply 1 year ago by creepykenny
  • Topic is favorited by 3 Pinsiders


Linked Games

#1 6 years ago

I have a Blackout (Williams System 6 from 1980) that is set to free play and the problem is that it sometimes is starting a 2-Player game when the Start button is only pressed once for a 1-Player game. This does not always happen.

Has anyone seen this? Apparently this is kind of a known problem as this old RGP link talks about it:

I don't buy the "that's just the way it is" line as I used to own a Blackout a couple years ago that did not ever do this once.

Does anyone have any idea what to look for fix this problem?


#2 6 years ago

Check and clean the leaf switch for game start it's probably dirty and needs a good cleaning, mine did the same thing awhile back. I used a thin piece of cardboard and cleaned the contacts so they were nice and shiny then adjusted, no more two player accidental starts.

4 years later
#3 2 years ago

sorry for the 4 year old necro-bumpage here

but from reading thru the RPG postings this problem is related to the green label game code - i am having this same issue also with a Blackout and it is definitely not the switch #03 start leaf switch since i have verified it will do this when the switch 2J2 & 2J3 harnesses are un-plugged and a jumper is used to activate the switch matrix # 03 thru the pins on the board, it still will start a two player game with a single touch and if you do touch the pin two times it will sometimes start a 4 player game

i can see how if the machine was not in free play this may not even be noticeable but when credits are abundant it is a problem because you can only start a 1 player game about 50% of the time - the other 50% are 2 player starts

has anyone found a cure or reason why some machines do this and not others?

#4 2 years ago

Just yesterday I started up a Gorgar that has been in storage for 25+ years. It is doing the same thing but with so many other minor issues to fix I haven't looked into it yet. I was guessing dirty switch. I'll know more by end of day but I do know that none of my Williams "green label" games exhibit this behavior.

#5 2 years ago

My Firepower does it occasionally also. Figure I need to adjust the switch gap, just too lazy. Maybe it's more than that?

#6 2 years ago

am thinking that if i take it out of free-play with zero credits add a leaf switch under the existing credit / start switch and use that to add credits maybe i can force it to start single player games

but i should probably pull the existing roms and verify the check sums first maybe there is an error

#7 2 years ago

I don't remember the thread, but I thought there was one here where someone found replacing a capacitor took care of the problem. If someone has plenty of time to read through all the Blackout posts, they may find that one.

#8 2 years ago

am going to check the board mounted pull up resistors, caps & voltages for both lines later this week when i get back to this machine

will also try to locate the thread/posts you speak of ...

#9 2 years ago

I cleaned and adjusted the credit switch on the Gorgar I'm working on that had the same issue and all is well. One player per push.

#10 2 years ago

Watching and added to favs. My flash had never done this until the other night. Lots of 2 player starts. Yeah it's a system 6 mpu with green flipper roms.

#11 2 years ago

stopped by today and replaced all missing grounding screws from all backbox mounted pcbs, inspected and tested continuity of the ground plug - OK there, then replaced the diode on the eject hole coil

so far i have started 5 single player games in a row with out a problem - not a large enough sample to say it is fixed so will keep testing / playing

btw, i had already replaced the credit switch diode, cleaned & adjusted its leaf switch and inspected the harness for shorts .. oh, and repaired some wiring hacks done to the coin door

#12 2 years ago

Clean and adjust the gap on the start button. Make the gap fairly tight like 1/16 to 1/8 inch. I find if the gap is too wide, it doesn't make solid contact and the CPU can read it as multiple presses. I've had this on several system 6 games and each time it was due to the leafs making contact just as the button was pressed in almost all the way.

#13 2 years ago

decided to replace diode on the eject hole switch and check its gap as well, have gone from very rarely starting a single player game to now starting a two player game with only one push of the credit button maybe 1 out of 20-25 or so games

since it still occasionally does this i haven't found all of the culprits - yet, never give up never surrender

4 weeks later
#14 1 year ago

ok so now the jury has reached a decision .... game was used in the tourney at SFGE this year and did not have a single 2 player start so we can call it fixed / repaired

parts used: 3 diodes, several screws for the pcb mounting plate

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