And so finally a post of more progress!
As of this morning I have the thing working 100%.
For now anyway of course.
I got irritated enough with the displays that I repinned that entire harness also- and still had one totally dead and another in seizure inducing flicker mode.
Dug around to find info on these plasma monsters and stumbled onto Steve Kulpa's waybackmachined website, and man is it good for working on this era machine.
As pbj wisely has said before, its all about the connectors.
After I repinned the harness and replaced those I found cold solder joints that would explain the display faults.
One had a flaky pin on the higb voltage line and the other a bad pin for the 5V line.
Reflowed all of those and voila- plasmolized joy!
Only other major issue was the drop targets not resetting nicely.
One would just launch- too far- and then come down cockeyed and stick.
A quick search on that issue (after taking the thing apart three times on my own and not finding anything obvious that I screwed up before) revealed that of course I wasn't the only person who suffered this malady.
I guess Bally design on drop target banks that era just sucked.
The fix is to install a rod between the springs and the target itself that prevents the things from getting boosted too high by the coil and reset bar.
What is REALLY odd thing is that there is already a pair of holes in the perfect spots to do this- but no rod!
So I remembered having a piece of 3/16" rod laying around and checked to see if it would fit the holes- and it is perfect- so out comes the cutting dies.
A little of this and that and you have a ready made drop target bank fix.
[img width=1024 height=1024]https://forum.arcadecontrols.com/index.php?action=dlattach;topic=164992.0;attach=398481;image[/
img]
It is hard to believe but I actually have a pin that is 100% functional now!
That would make one out of four
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Topic: OG Play pinball because you are a boy (Read 106230 times)
