Mitsubishi Electric EZMotion-NC E60 Series, Operation Manual

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6. Daily Maintenance and Periodic Inspection and Maintenance
6.2 Maintenance Items
III -36
6.2.1 Escutcheon
Wipe the escutcheon and keyboard 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. Note that the escutcheon and
keyboard are not waterproof, so make sure that liquids do not get inside.
6.2.2 Handling the CRT
(1) Effect of magnetic fields
The CRT displays by scanning an electronic beam with a magnetic field. The display can be
affected by external magnetic fields resulting in "screen distortion" and "screen wavering". Thus,
sufficient caution must be taken against external magnetic fields.
For example, when a steel plate case is used to house the CRT, the case could be magnetized if a
magnetic stand, etc., is attached. This can cause "screen distortion". The CRT could also be
affected by a motor, transformer or magnetized workpiece.
(2) Braun tube life
The life of the Braun tube is approx. 7,000 hours.
Note that this time is the time for the emission efficiency to drop to 70% of the initial value (differs
according to the Braun tube maker), and does not mean that the Braun tube is unusable. The
luminance may drop, etc., but continued use is possible.
(3) Adjustment
The CRT has been adjusted before shipping from the factory, and does not need to be readjusted.
6.2.3 Handling the LCD Panel
(1) Precautions for use
(a) The polarizing plate (display surface) of the LCD surface can be easily scratched, so be careful
during handling.
(b) 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.
(c) 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.
(d) Wipe off any dirt, dust, etc., on the polarizing plate using absorbent cotton or other soft cloth.
(e) A CMOS LSI is used in the LCD panel, so be careful of static electricity when handling.
(f) Never disassemble the LCD. Doing so will damage the panel.
(2) Precautions for storage
(a) Do not store the LCD in locations having a high temperature or humidity. (Store within the
storage temperature range.)
(b) When storing the LCD as an individual unit, be sure that other objects do not touch or hit the
polarizing plate (display surface).
(c) When storing the LCD for long periods, be sure to store in a dark place away from exposure to
direct sunlight or fluorescent light.
(3) Backlight life
The life of the backlight is 20,000 hours at 25
°
C for FCU6-DUT11 or 40,000 hours at 25
°
C for
FCU6-DUN24. (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.
It is not possible to replace only the backlight, so the LCD panel must be replaced when the life is
reached.
(4) 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.
(5) Unevenness, luminescent spots and irregularities
Uneven brightness, small luminescent spots or small dark spots may appear on LCD, but this is not
a fault.