Eizo TX D7 - Manual (Page 39)

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39
3 TROUBLESHOOTING
Problems
7) Moiré patterns are
distracting.
8) The image is flickering.
n Color problems
Problems
1) The entire screen appears
bluish or reddish.
2) Color purity is not uniform.
Points to check with possible solutions
• Go to the ScreenManager’s “Screen” menu. Switch
on the moiré reduction feature and adjust as
necessary. See page 22.
• Flicker will occur with interlaced scanning, or non-
interlaced scanning with a low refresh rate. All
EIZO monitors are capable of reproducing high
refresh rates for non-interlaced scanning. If a
problem occurs when using a non-interlaced signal,
try adjusting the graphics board to increase the
refresh rate (if possible). Refer to the graphics board
manual for information.
Points to check with possible solutions
• The CRT is not warmed up. Allow 30 minutes for
the monitor to stabilize.
• Allow 30 minutes for the monitor to warm up.
• Degauss the screen. (Use the degaussing feature in
the ScreenManager’s “Others” menu. See page 33.)
Non-Interlaced / Interlaced
In a “non-interlaced” scan, the electric guns draw the entire image in one vertical
pass, with each pass covering every horizontal line.
In a “interlaced” scan, the guns draw the entire image by scanning vertically twice.
At the first scanning, the guns draw every other horizontal line. At the second, they
draw the other lines. Thus, in a “interlaced scan”, the image flickers more visibly
when compared with a “non-interlaced” scan.
Flicker
The term “flicker” refers to noticeable shimmering that occurs when the image on the
screen is redrawn (“refreshed”) too slowly. A refresh rate of 80 Hz means the image
is redrawn 80 times per second. Most people will notice flicker at image refresh rates
as high as 60 or 70 Hz, whereas refresh rates of 72 Hz or above usually is not
noticeable. Flicker is known to be the cause of visual fatigue.