Winston-salem, NC
If I ring up 10 credits, the display indicates there are zero credits. Is this normal or do I have a display digit out?
(Topic ID: 328259)
Linked Games
Eight Ball
Bally, 1977
Topic Gallery
If the game plays like there is a credit it's probably a display problem. Put the game into display test. If the digit fails to work in test you have a bad display. The typical fail for a single digit out is a burned out 100k resistor. You can also substitute a 7 digit display into that position and test. You can't do the reverse however.
Hard to get a photo, but here it is.
All the displays are 6 digit. The same display (AS 2518-15) is used for the score and credit/ball.
As suggested, I moved the score display into the credit/ball display. All the digits work. Must be an issue with the display.
Since they are all AS 2518-15, I put the credit/ball display into a score display. The 10’s, 100’s and the 10,000 digit did not work.
FB80378C-6843-4D62-A3D0-58A5FD023D63 (resized).jpeglooking at the gas display segments.....they don't look good I'm sorry. They should all have the same brightness, that 0 being brighter may be a result of the digit itself on the way out, or possibly the 100K resistor out of spec.
you could try changing the digit drivers? They are 2N5401's
10 - Q8
100 - Q9
10,000 Q11
What voltage reading do you get at TP2 on the display board, or any display board?
You can test transistors with the game off using your multi meter and in diode test, comparing against a known good one.
It's a long and tedious job, but changing the connectors, well the pins really, will make for peace of mind as it sounds like you have an intermittent connection issue.
It could be the 100k resistors for those digits. Check that first. Three transistors out is unlikely.
Quoted from ncsujeff:It was the 100 ohm resistors
They are 100k ohm resisitor. If you used 100 ohm there will be other issues.
What voltage are you running the displays at? Factory setting is 190 but I like to dial it down to 180v. Don't go any lower as that will cause fails in the HV regulator circuit.
Promoted items from Pinside Marketplace and Pinside Shops!
Reply
Wanna join the discussion? Please sign in to reply to this topic.
Hey there! Welcome to Pinside!
Donate to PinsideGreat to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
