Bally Stern Displays (old Type)

[faza]

I want to swap the glass on a Stern DA 100 onto a Bally AS2518 after unsoldering the glass display from the Stern i noticed that stern display glass does not have as many pins soldered to the board as the Bally glass display.
Does anybody know if the glasses are interchangable.
(I want to swap the glass with no burn in onto the Bally as the tracks on the Stern pcb have lifted badly)

[Ballywannabe]

Yes, they are

Some makers put more pins on for some reason - most of them don't connect.  The hard bit is getting the pins back through the holes to solder them.

cheers
Ian

[Retropin]

You just need to replicate whats soldered on with the Stern displays... as ballywannabe states - not all the pins are used

[faza]

I have swapped over the glass and two different segments on different digits do not work .
From what i have read i assume that the glass is faulty?

[Retropin]

Er No - if the glass is faulty then it would not work at all due to it "gassing out" OR you have segment burn which is normally noticeable due to a small burn spot at the corner of the segment.

Missing segments that show no signs of burn is either a faulty solder joint, or from memory, the small driver transistor

[faza]

That sounds promising maybe i read it wrong i thought that the same segment in each digit would not work if it was a resistor.
The glass looks perfect no burn in it.

[Ballywannabe]

Sorry Faza, I think your diagnosis is correct - different segments missing on different numbers is not a good sign.  Try turning the voltage up (but not over 190V) nad see if that helps.

cheers
Ian

[faza]

Thanks might give that a go tomorrow

[MrMaloo]

As a quick test faza power up the display and then "gently" press on the front of the glass . If the missing lines appear when you press on it then it is most likely a bad connection at the pin joints where you connected the new glass ( I have heard that they can be difficult to get to seat correctly) .

Failing that there is some very useful info here about which resistors etc. control which digit segment :

 http://www.pinrepair.com/bally/index3.htm#display