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To remove this dust periodically, use soft cloth moistened with silicone type glass cleaner.
Never use thinner or the like instead of the cleaner.
6.3.2
Cautions for safety
NOTE: Observe all the cautions and notices concerning safety labeled on the chassis or CRT.
(1)
Hazardous voltage exists in the monitor.
equipment, be sure to observe general electrical cautions.
(2)
Before removing or replacing PCB (module) and parts, turn OFF the power.
(3)
Residual charge may remain in the anode cap. Greatest care should be taken for
replacement or inspection maintenance of CRT.
(4)
Do not replace any parts at your discretion. Fire, X-ray or other hazard may result.
6.3.3
Replacing the fuse
When the fuse is to be replaced, use that supplemented to the monitor or the same type and
capacity.
The fuse is mounted on the main board (AVB401) inside the monitor. Be sure to turn OFF
the power before removing the cover and replacing the fuse.
6.3.4
Degaussing
This monitor is equipped with the automatic and manual degaussing function.
When turning ON the power, it is automatically degaussed. If the monitor is magnetized in
any reason and color purity of the image is deteriorated, remove the cover and press the
DEGAUSS switch on the VIDEO board (AVB411) to manually degauss.
If this action cannot fully degauss the monitor, use the degaussing coil commercially
available to do so externally.
6.4 Description of Operation
6.4.1
General
This monitor is composed roughly of the following 6 modules:
① Brown tube
② Main board
③ VIDEO board
④ Socket board
⑤ Control board
⑥ Front control board
6.4.2
Brown tube (CRT)
CRT is designed to make a light spot on the fluorescent screen by electron beam emitted
from the electron gun, deflect the electron beam with the deflection coil in a constant cycle,
and display an image by a locus of this light spot.
CRT is composed of the fluorescent screen coated in three colors, shadow mask and electron
gun to emit three electron beams. The electron gun is composed of metal coil heater,
cathode and grid arranged on a line.
When removing the cover to work in the
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L1E-EA0229
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