joltes@husc9.harvard.edu (Richard Joltes) (11/01/90)
Does anyone have any hard data on a fix for the infamous VR260 plague (other than buying a better monitor, that is)? For anyone not familiar these tubes have a tendency to blow out deflection boards at irregular intervals -- you know you have one when the monitor won't fire and all you get is a noise pulse from the rear and a slowly blinking power LED. I had heard that the culprit was the IRF622 N-style regulator on the board. I tried replacing one, though, with no effect, but I'm REALLY TIRED of having to call DEC in to replace the boards. Anyone know of a good fix? Thanks, Dick Joltes joltes@husc9.harvard.edu Mgr. of Hardware & Facilities Harvard University Science Center
jcd@pitt.UUCP (Jim Durham) (11/10/90)
In article <4563@husc6.harvard.edu> joltes@husc9.harvard.edu (Richard Joltes) writes: >Does anyone have any hard data on a fix for the infamous VR260 plague (other >than buying a better monitor, that is)? For anyone not familiar these tubes >have a tendency to blow out deflection boards at irregular intervals -- you (stuff deleted)> >I had heard that the culprit was the IRF622 N-style regulator on the board. I >tried replacing one, though, with no effect, but I'm REALLY TIRED of having to >call DEC in to replace the boards. > The culprit seems to be the flyback transformer. >Anyone know of a good fix? Apparently DEC has a new version of the board. I thought this fixed the problem, but from what you say, maybe not. I was wondering if a fan would help. VR-260s seem to run really warm. If you notice, the source resistors for the Mosfets burn the board and there's a lot of heat coming out the vents. This would cool the flyback and the Mosfets.> -Good Luck Jim Durham (jcd@cs.pitt.edu | durham@w2xo.pgh.pa.us )