Twilight Zone
Bally, 1993I did not get so much help with my previous problems so I try with another one.
On my TZ, there are 4 service switches:
Escape, -, + and Enter
All work except the "+" button acts as the "Enter" button. So It's now impossible to increase the sound volume, and in every menu I have to go backward using the "-" button to select a sub-menu.
I checked already the wires of each button and the "+" is not touching the "Enter" one.
A few thoughts.
Lug side of the switches shorting to metal ?
Switches gummed up and shorting to each other ?
Coin door interface board have metal dust on the component side from the flippers, or screws or nuts behind the board ?
Unplug the connector for the coin door from the coin door interface board and put a meter on the "+" wire ( not the black common wire ) and see if it's shorting to any other wires.
LTG : )™
Very very strange. Something is definitely flaky with this "+" button. I unplugged everything (including the conncetion in the backbox), then reconnect everything, same issue.
I started to hit rapidly on the + button and -sometimes- it was acting as the "+", most of the time as the Enter.
I unscrewed the service switch assembly, same issue, until I started to shake the "+" button assembly. Then, I re-screwed everyting in place and it works well now.
I still dont understand what was wrong, and I'm pretty sure the problem will come back later...
Problem is still there. I checked all wires and solders, no shortcut anywhere. I also cleaned the board under the left flipper button (in fact I restored entirely my TZ) so it's 100% clean.
Here is a video of the problem. Only the "Up/+" button is acting as up and enter, the other ones are perfectly fine.
Could be a bad trace, Great info on direct input switchs here>> http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Direct_Switch_Problems
For what it's worth, my T2 has a new CPU with remote battery holder, no corrosion, and from time to time I'll get the same symptom where the + sign will trigger an enter button press(haven't cared enough to look into it). A tech buddy of mine said it's probably a short in the switches somewhere in there as there are a few exposed wires. Those service switches are cheap, wouldn't hurt to try replacing it before going through too much trouble repairing the corroding parts. Eliminate the easy variable first?
If there were no signs of corrosion this might be a good idea. However, since there is visual confirmation of corrosion and the known result of that is the diag switches going haywire and phantom firing, I think doing anything with the switches themselves would be a waste of time.
I would send the board to John Wart Jr or Barakandi or another reputable service provider for professional repair.
IMO.
Quoted from RVApinballer:For what it's worth, my T2 has a new CPU with remote battery holder, no corrosion, and from time to time I'll get the same symptom where the + sign will trigger an enter button press(haven't cared enough to look into it). A tech buddy of mine said it's probably a short in the switches somewhere in there as there are a few exposed wires. Those service switches are cheap, wouldn't hurt to try replacing it before going through too much trouble repairing the corroding parts. Eliminate the easy variable first?
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San Jose, CA
