Eizo FLEXSCAN F980 Manuel d'utilisateur télécharger pdf (Page 44)

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

31.)

Allow 30 minutes for the monitor to warm up.

Adjust the convergence using the Convergence

feature in the ScreenManager’s Screen menu. See

page 20.

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.

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Eizo FLEXSCAN F980 Manuel d'utilisateur Page 44