testing +5 on tron

tron guy

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I think when I installed the battery holder (for high score save) I may have inadvertantly adjusted the +5, leading to my sprite issues.
Previously the board was tested for 20 hours with no issue.

So, as I go to adjust the +5 on the power board, is there a test point on there, or is it easy to test?

(haven't looked yet, thought I would ask here)
 
Beside the battery on the power pcb there are two molexes. To the right of the second molex there is a capacitor. With your MM, put the ground pin on the negative end and the other pin on the positive end. I can't remember if that gives you the +5 reading or the +12 reading, but if it's not the one you're looking for, keep the ground pin on the same spot and try the positive end of the other cap further down on the board.

I know: a picture is worth a thousand words, but I don't have a pic...
 
well great description.

my +5 is 5.12
and the +12 is 12 on the dot.

guess i need to start checking connections and reseating chips.
thanks
 
I just fixed an EDOT board with a sprite issue by replacing the 6116's, so I'd start with those...
 
how many do I need and where do I get them?


I should mention this board was tested as working for a long time and has new ribbon cables.
 
Not sure if the Tron is the same as the EDOT, but there were two - one on the back board and one on the middle board.

I had some on hand, but Jameco sells them for about $2 each. You could try reseating them first...
 
for the record I fixed it.

I reseated a lot of chips and made sure connections were good.

I think it's equally as likely (or more) that I hooked it up missing 1 pin or something, than the fact that I may have done something reseating chips.

who knows
 
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