T Z optic problem

HAVASUGAMEMAN

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lake havasu city, Arizona
i have been trying to get this game going, have done alot to it already but cant seem to find the prob. with some of the optos.traced it down to col. 7 .. took voltages on opto board (under playfeild) all where good take measurment at opto and two are reading at about 9.3v when blocked they drop to 6.5 or so , on working opto read is 11.5 blocked about .7 also getting good read on trans at about 1.3v on all optos ? also last two sw in that colm. middle and upper million work fine not sure if that matters? because there not optos ? thanks for the help
 
i have been trying to get this game going, have done alot to it already but cant seem to find the prob. with some of the optos.traced it down to col. 7 .. took voltages on opto board (under playfeild) all where good take measurment at opto and two are reading at about 9.3v when blocked they drop to 6.5 or so , on working opto read is 11.5 blocked about .7 also getting good read on trans at about 1.3v on all optos ? also last two sw in that colm. middle and upper million work fine not sure if that matters? because there not optos ? thanks for the help

Well I will say if your having issues with col 7. I would check your opto board under the playfield. you may have a failing LM339... I normally socket and replace them all.
 
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