Detroit, MI
please in very small detail type one thing at a time,it would be much easier step by step.
what is the game/display doing?
(Topic ID: 216027)
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Quoted from donh:Well, I've since confirmed it is the power supply - specifically the negative 100 volt supply. I'm getting 99.2V on the positive but a max of about -41 on the negative side and it constantly fluctuates - likely causing the displays to do the same. Caps are new so I'm down to R1 or the zenor diodes or transistor. Any thoughts where to look first?
how are the connectors on the boards?are they in good shape?not burnt,brownish color,cracked,ect. do the header pins need a reflow of solder?
Quoted from donh:- specifically the negative 100 volt supply. I'm getting 99.2V on the positive but a max of about -41 on the negative side and it constantly fluctuates - likely causing the displays to do the same.
there has to be +100 and -100 volts for the score displays to light up properly
Quoted from CadillacMusic:Oh, it's the diagnostics LED? Thought it was blanking for some reason. Reading comprehension fail. Edit: I even wrote diagnostic in my post, but my brain was thinking blanking. Wow.
its alright we are all getting old... 
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