Sony CPD-20SF2T5 Operating Instructions Manual page 11

Wavy or elliptical (moire) pattern is visible
/ Due to the relationship between resolution,
monitor dot pitch and the pitch of some image
patterns, certain screen backgrounds,
especially gray, sometimes show moire. This
can only be eliminated by changing your
desktop pattern.
* The Auto-degauss function demagnetizes the metal
frame of the CRT to obtain a neutral field for uniform
color reproduction. If a second degauss cycle is needed,
allow a minimum interval of 20 minutes for the best
result.
If the problem persists, call your authorized Sony dealer
from a location near your monitor.
Note the model name and the serial number of your
monitor. Also note the make and name of your computer
and video board.
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