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4. DAILY MAINTENANCE AND PERIODIC INSPECTION AND MAINTENANCE
4.2 Maintenance Items
II - 24
4.2.1 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.
4.2.2 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 extended 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/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.
(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.
When using the 10.4 LCD, the brightness can be adjusted with the parameter settings.
4.2.3 IC Card
(1) Handling the IC card
The general handling methods for the IC card are described below.
Refer to the instruction manual of the IC card used for details.
(a) Precautions for use
1) Insert the card in the correct direction.
2) Do not touch the connector area with the hands or metal.
3) Do not apply excessive force to the connector area.
4) Do not subject the card to bending or strong impacts.
5) Do not open the cover or disassemble the card.
6) Do not use the card in dusty locations.
(b) Precautions for storage
1) Do not store the card in locations having a high temperature or humidity.
2) Do not store the card in dusty locations.