Zenith Sentry TV/Monitor

Those are horizontal retrace lines occurring during the vertical retrace interval. If you can find the 'blanking' adjustment, tweak it.

If there's no blanking adjustment, it's time to tweak the high voltage adjustment called (usually) 'screen'. It's likely that contrast will get lots better when this is done correctly. Don't let the shadow detail get lost, though.

Hello, and thanks for taking the time. But as I pointed out in my OP they are definitely not retrace lines. The lines are grouped into sets of a specific pattern and that are inclined at an angle (relative to horizontal) much greater than that observed with retrace lines. Some Googling on Sentry model sets indicates that a capacitor may be the culprit reponsible for the picture artifacts. I realize it's difficult to provide advice when one can't see the actual pattern but again, thanks. Sincerely,

John Wood (Code 5550) e-mail: snipped-for-privacy@itd.nrl.navy.mil Naval Research Laboratory

If their not retrace lines, brightness too high, bias on crt to high I'm taking that this is a crt set how wide are these lines are they colored lines if you think it might be a capacitor problem why not go through it with a esr meter.