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Museum of the Game® & International Arcade Museum® Forums
I've got a K4600 that's flickering. B+ measures 115vdc, and should be 127vdc. VR501 won't let me adjust above 115vdc.. The chassis was recapped probably 6 years ago, and all caps look fine. I've tested all components on the little side power board, and side transistors (TR501 and TR502) — all fine. TR502 initially had a low hFE, so I replaced it with a fresh one - no change beyond needing to adjust the vsync.
There doesn't appear to be any cold solder joints, but will check in detail.
I noticed the manual has VR501 as 81k ohms, and mine has a 1k ohm potentiometer from APAR and @security0001. Could this be the issue?
Anyone have any other thoughts on areas I should check?