www.papinball.com/tips/Stern_Classic_SB_15.pdf
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when removing the connectors from the displays or plugging them back in make sure you turn the power off
Quoted from barakandl:I don't think you need to go out of your way to change the 100k resistors in the digit drive to 1/2w. In my XP they only fail when there is some other problem that makes them fail, like a locked digit driver.
I agree with barakandi when i fixed one of my stern machine display the problem wasnt where i thought it would be ,
the first thing i changed was the header pins J1 , if you want practice your soldiering skills this is good to work on
parts are cheap change Q18 if no good R28,then R23
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