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4 TROUBLESHOOTING
Explanation of the Characteristics of CRTs
When the monitor is not fully warmed up, the screen may look slightly colored, e.g.
reddish or bluish. This phenomenon is due to the unstableness of the electron gun
during its warm-up period. Please wait for about 30 minutes until the monitor
stabilizes in order to gain its proper color.
n Color problems
Problems
1) The entire screen appears
bluish or reddish.
2) Color purity is not uniform.
3) Misconvergence of colors.
(red, green, blue)
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.
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
35.)
Allow 30 minutes for the monitor to warm up.
Adjust the convergence using the Convergence
feature in the ScreenManager’s Screen menu. See
page 24.
This problem can occur when using a BNC
connection and the termination switch is set
incorrectly. The termination switch should be set
to 75 Ω for connection to a single monitor.