25K5515 (K49xx Med Res) Vert Issue

WindDrake

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Got a weird one that I've spent a couple of hours beating my head against.

25K5515 out of a 720, was fully recapped several months ago by yours truly. Worked fine when it left after a 24 hour run test. No issues.

Buddy got it home, hooked it up, and told me that the vert had shrunk and could not be adjusted enough.

Got it here, and it's doing this.

R67M5WMl.jpg


It looks like that while bouncing/rolling like a sync issue.

I've swapped Q302/Q303, replaced Q301, verified the big concrete resistor at R313, I also re-replaced C310, C313 and C315 in case those had taken a dump somehow. No change. Even changed out IC301, no change. I've also done extensive tracing of the vertical section to ensure no broken traces and have come up with nothing. The chassis is in good physical shape, so I'm stumped on this one.

Any ideas, fellas?
 
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