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6. Daily Maintenance and Periodic Inspection and Maintenance
6.2 Maintenance Items
III-38
6.2.1 Escutcheon
(1) Cleaning the escutcheon
1) Keep the rear side of the escutcheon as clean as possible.
2) Wipe the escutcheon with a soft, clean, dry cloth. If cleaning is still required, put some neutral
detergent on a cloth and wipe. Do not use alcohol, thinner, etc.
6.2.2 LCD Panel
(1) Handling the LCD panel
(a) Precautions for use
1) The polarizing plate (display surface) of the LCD panel surface can be easily scratched, so be careful
during handling.
2) Glass is used in the LCD panel. Be careful not to drop the LCD panel or allow it to hit hard objects, as
the glass may chip or break.
3) The polarizing plate may be stained or discolored if drops of water, etc., adhere to it for long periods,
so be sure to wipe off any moisture immediately.
4) Wipe off any dirt, dust, etc., on the polarizing plate using absorbent cotton or other soft cloth.
5) A CMOS LSI is used in the LCD panel, so be careful of static electricity when handling.
6) Never disassemble the LCD panel. Doing so will damage the panel.
(b) Precautions for storage
1) Do not store the LCD panel in locations having a high temperature or humidity. (Store within the
storage temperature range.)
2) When storing the LCD panel as an individual unit, be sure that other objects do not touch or hit the
polarizing plate (display surface).
3) When storing the LCD panel for long periods, be sure to store in a dark place away from exposure to
direct sunlight or fluorescent light.
(2) Other precautions for use
(a) Backlight life
The life of the backlight is 25,000 hours for the 7.2-inch type and 25,000 hours for the 10.4-inch type at
25°C. (Time for luminance to drop to 50% of the initial value.)
The backlight life is dependent on the temperature. The life tends to be shorter when used continuously
at lower temperatures.
Deterioration of the backlight can be prevented by turning OFF the backlight with the screen saver
function when the screen is not used for a long time.
(b) Luminance start
Due to the characteristics of the backlight, the luminance could drop slightly at lower temperatures. It will
take approx.10 to 15 minutes for the luminance to reach the rated value after the power is turned ON.
(c) Unevenness, luminescent spots and irregularities
Uneven brightness, small luminescent spots or small dark spots may appear on LCD, but this is not a
fault.
(d) Contrast
The contrast of STN method LCD panels changes with temperature fluctuation. If this happens and the
panel is difficult to see, open the operation box door and adjust the contrast with the contrast adjustment
potentiometer on the LCD signal interface PCB.
(3) Replacing the backlight
Replacement should be commissioned to the Mitsubishi Service Center.