Specifications

Troubleshooting First Checklist - 3
The CRT raster will not always resemble a
perfect rectangle.
CRT tolerances allow for some distortion. Additional distortion can
be caused by magnetized metal objects (desks, file cabinets, etc.).
Move the unit to a different location if you notice raster bowing or
bent raster edges.
Jitter, faint lines, or screen movement can be
caused by external interference such as
electronic devices and fluorescent lights.
Move the unit to another room or building to help determine if
external interference is the source of the problem.