K7000 loses vertical synch when focus pot is adjusted

mcandrewsoun

Well-known member
Joined
Feb 26, 2010
Messages
1,602
Reaction score
63
Location
Fincastle, Virginia
K7000 loses vertical synch when focus pot is adjusted

Heres a wierd one, Seems like some kind of power supply problem,like the draw from the focus grid is dragging the VHold down.... I recapped, replaced flyback, HOT, VR and Retrace cap.. The picture is fine and stable if its out of focus..When I adjust the focus, I get jittery vertical hold..its looses it, then snaps back every second or so. If I move it back to unfocused, its fine.. I havent tried a different tube though.. Anyone seen this?

Andrew
 
flyback

Did you mistakeingly put the focus wire in the screen spot and vice versa on the neck board? Was this doing the same thing before you worked on it?
 
I bought the chassis as dead, and rebuilt it.. Its basically my test monitor right now..It worked fine (I think) when I first rebuilt it..but I can remember if the tube its on now was the same I tested it on.. I fixed 6 monitors (4 K7000s) that weekend, and cant keep it straight!

Andrew
 
Back
Top Bottom