Zenith 19" Chromacolor II service suggestions

[Kevin Kuehn]

Originally Posted by old_tv_nut

Forget using the vertical hold, and adjust the height very slowly. Moire caused by the CRT should stay in the same area but ripple through.

I'm not exactly clear on what you mean by ripple through, although I do see the spacing between the shading change, and if I continue changing the height the pattern can even change it's shape. I'm testing with a stationary picture. As Zeno mentions this may not be what most would consider a textbook moire. Sometimes it shows up in smaller area's, but it's more of a rippled shading effect rather than a distinct color changing pattern. If you look at shading at the tops of the two pictures it's almost more a sinusoidal pattern. The finer fingerprint on the right side of the green background is a camera artifact.

[old_tv_nut]

Originally Posted by Kevin Kuehn

I'm not exactly clear on what you mean by ripple through, although I do see the spacing between the shading change, and if I continue changing the height the pattern can even change it's shape. I'm testing with a stationary picture. As Zeno mentions this may not be what most would consider a textbook moire. Sometimes it shows up in smaller area's, but it's more of a rippled shading effect rather than a distinct color changing pattern. If you look at shading at the tops of the two pictures it's almost more a sinusoidal pattern. The finer fingerprint on the right side of the green background is a camera artifact.

You are describing exactly the kind of effects expected due to the CRT and not the signal circuits, so, case closed.