Is there a higher resolution version of that picture available? A direct link maybe?
not that I could find. I can reach out to the author and see maybe he is on here.
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Is there a higher resolution version of that picture available? A direct link maybe?
Was searching Mid-Atlantic Arcade group on facebook and found this which is 1000 times better than my description of the components in the video. I briefly reviewed and the only thing that I think is incorrect is the Gray sync ckt reference. That is actually the "pump charger" which feeds the "one shot", both of which are part of the reset ckt....based on my understanding.
Not sure how the AC sync ckt truly works but only U4 &R202 are involved in the below diagram. U4 feeds the rest of the AC sync components (u6, c207, r219, etc) which are not shown.
<<edit>> Also will mention, for those that don't watch the video, that the fuse F1 is actually part of the +5 regulation ckt. U2 and Q105 get their power from the unreg +12 straight from game transformer. here is where I discover that https://youtu.be/OpBOEqojOJY?t=3m48s
Anyway still nice little diagram.
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and the reason I even started down this MCR discovery path. MCR Hum issue solved. Might do at least one more, in the future, on a different power supply that has a reset ckt issue.
Question... if you have this setup can you eliminate the power brick completely?
In this video that TT did it looked like he eliminated everything in a Solar Fox cocktail...
https://www.youtube.com/watch?v=iRlOp4c2A-A
and the reason I even started down this MCR discovery path. MCR Hum issue solved. Might do at least one more, in the future, on a different power supply that has a reset ckt issue.
That's pretty cool; glad you found the issue!
It's kind of odd; those caps weren't reading that far off from the new ones you used...
Ok this is strange and it took me a bit to figure out the history, so documenting here mostly for myself, but the rev. D board at end of above video, from spy hunter, ended up in my Tron cab.
In between like Jan - Feb my Tron developed an issue (i think it was hum actually but not certain) and I put in the fixed rev C board (beg of video) into it (didn't have caps on hand to address tron power board) but subsequently sold that rev. C board and put my fixed spy hunter rev D board (from above video) into Tron. I sold the rev.C board knowing I had other MCR boards ready to be fixed up, had already done the battery mod, was still working on spy hunter, wasn't original to any of my games, blah blah..anyway.
So a few weeks ago my Tron develops Hum (likely again) just like the spy hunter. It turns out to be the same c102 cap (+12 reg ckt) I replaced in previous video. Again the ESR and capacitance (@ 540uf instead of 470uf) wasn't that far off but was not great. I guess I either used bad caps (<likely) or something else is causing them to degrade prematurely (< filter caps??).
Long story but another MCR Hum issue addressed by replacing c102.

