I was reading this guide (http://stevekulpa.net/pinball/bally_disp6r.htm) and I have the last digit out on a AS-2518-15 display. What 2 transistors do I replace? The guide says Q1 and Q7 for AS-2518-21 but I don't see a Q1 on the AS-2518-15. Any help would be appreciated. Thanks, Mike
Time for some spring cleaning!
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info
Quoted from ChrisHibler:Time for some spring cleaning!
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info
Haha indeed!
Quoted from PinballManiac40:A small 1" dry paint brush will get that dust right off.
Good idea!
this should help you
http://www.papinball.com/tips/Stern_Classic_SB_15.pdf
Quoted from Shenanigander:The guide says Q1 and Q7 for AS-2518-21 but I don't see a Q1 on the AS-2518-15. Any help would be appreciated. Thanks, Mike
Q1, Q7 plus R1 & R2 are what you should be looking at first and check if you have any cracked solder on the connector pins
Quoted from eh97ac:DISHWASHER TIME!
I don't have a dishwasher but if I want to drench it do I have to remove the glass from the board first?
Quoted from Raff:this should help you
http://www.papinball.com/tips/Stern_Classic_SB_15.pdf
Awesome. Downloaded and saved!
Quoted from MrBally:Or, replace the 100k resistor that is likely opened in the circuit.
Quoted from Raff:Q1, Q7 plus R1 & R2 are what you should be looking at first and check if you have any cracked solder on the connector pins
Going to replace Q1 and Q7 first. If that does not work I will try the resistors. I did reflow the header pins 
bad level shifters usually make a digit really bright (locked on)
bad digit drivers usually make a digit not light
open 100k resistor is usually a symptom of a really bright (locked on) on digit.
I'd replace the 100k resistor in the circuit first. I've replaced hundreds, if not over a thousand of them in Bally displays. They open often. This results in a blank digit. Usually when the transistor for a digit is out, that digit glows brighter than others.
Quoted from MrBally:I'd replace the 100k resistor in the circuit first. I've replaced hundreds, if not over a thousand of them in Bally displays. They open often. This results in a blank digit. Usually when the transistor for a digit is out, that digit glows brighter than others.
It is a bad level shifter that makes a digit glow really bright typically. So much so other digits will sometimes not be able to light.
if a single 100k resistor is open... digit locked on bright. if all of the 100k resistors are open, the display probably has had a hv regulation circuit shorted to 230v for an extended period.
Bally probably should have used half watt resistors there, but i don't think preemptively changing all of them is really needed. I am pretty confident the 100k resistor fails when the digit locks on bright. easier to test than a transistor.
Quoted from Shenanigander:I don't have a dishwasher but if I want to drench it do I have to remove the glass from the board first?
Nope, simple green, old tooth brush and some hot water on the pcb. I do mine at the end of the night and place over the register.
To alleviate some fears:
Careful getting the display glass wet. I have seen issues with water getting trapped and causing arcing. I had to sit some in desiccant chamber overnight.
Quoted from eh97ac:Nope, simple green, old tooth brush and some hot water on the pcb. I do mine at the end of the night and place over the register.
To alleviate some fears: » YouTube video
I have some super clean. I think it is pretty much the same thing. I will try that thanks. Nice touch with The Canadian Arcade
Quoted from barakandl:Careful getting the display glass wet. I have seen issues with water getting trapped and causing arcing. I had to sit some in desiccant chamber overnight.
Ok good call will do thanks!
I rinse PCBs under the sink w simple green n a toothbrush if they have no moving parts or anything that can get muffed up, then dry immediately with a heat gun at a good distance. Never was brave enough to do a working glass display.
I use Castro Super Clean. Spray it on and let IT work. Rinse thoroughly. You can get it as wet as you want. Just make sure to let it dry thoroughly. I set mine on top of a furnace vent overnight.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info
Quoted from MrBally:Or, replace the 100k resistor that is likely opened in the circuit.
That was it! Display back up and running!
Wanna join the discussion? Please sign in to reply to this topic.
Great 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+!
This page was printed from https://pinside.com/pinball/forum/topic/6-digit-display-question-one-digit-is-out and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
London, ON
Vancouver, WA
North Adelaide
