Old Bally displays

blitz_8255

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Jan 2, 2009
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Just looked at a kings of steel for a buddy and it seems that the displays have an issue. When it is cycling through the high scores, or in test, a few of the digits on all the displays quickly flash zeros when they should be showing a different number. I swapped U11 and U10 with known good chips and no change. Disconnected all the displys, they each do it by thierselves. Never saw this one before. Maybe U14, U19, or U20 on the mpu board??? I'm guessing, any ideas??
 
Been deep in the box and find that a switch strobe line is shorted to something on the playfield somewhere. Bumper gives me a credit drop target starts a game...etc I'm in the process of usng a jumper and a diode at the mpu board connector to verify the mpu and so far so good. Came in for a drink and a sandwich. Heading out to dive back in...
 
Strobe line was shorting to the GI line through the bolt that holds the pop bumper switches and tie points for the bumper lamp. One of the insulating tubes had been removed?!?! Working great now!
 
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