Vintage RCA Projector Big Screen

[JohnCT]

Originally Posted by stushug

I tried today to get the picture centered, it was way off to the right. I could not get it right, now none of the guns are aligned, Every time I tried to redo it, I just made it worse. Does anyone know of a good repair guy in the Pittsburgh area?

There's a bit of an art to aligning a PTV. Not as bad as a piano tuning, but you get the point. Hopefully, you marked anything you adjusted so you can put them back.

First, treat this TV like a B&W TV. Cover the red and blue tubes and just work on the green.

There are centering ring magnets around the neck of the tubes, but they shouldn't be disturbed unless the CRT is replaced. If you moved them, see if you can put them back on the mark. Sometimes, the white snot they use to keep the rings from walking will be brittle and putting the rings back in position will be like putting a puzzle piece together.

If the green tube isn't centered, there are several possibilities. I recall problems with the hinges on some of those that would put the mirror in the wrong position. This will generally affect the vertical centering, not the horizontal.

There might also be adjustments on the convergence board for basic centering of the individual tubes, but again, these really don't need to be disturbed except for tweaking.

If the green still is off, it might be an electrical issue. Most of the problems we had with those were two thick film hybrid modules, but they either caused no vertical deflection (the vert hybrid) or shutdown (the power supply hybrid), so I don't think there's an issue there.

I think I tossed all those manuals but I'll take a look at my shop tomorrow to see if I still have any.

John