User manual

LT Series User Manual 8–3
Chapter 8 – Maintenance
8.2 Periodic Check Points
To keep your LT unit in its best condition, inspect the following points periodically.
LT Operation Environment
• Is the operating temperature within the allowable range (0
o
C to 50
o
C )?
• Is the operating humidity within the specified range (10% RH to 90% RH)?
• Is the operating atmosphere free of corrosive gases?
Electrical Specifications
• Is the input voltage appropriate (DC 20.4V to DC 28.8V)?
Related Items
• Are all power cords and cables properly connected? Have any cords or cables
become loose?
• Are all mounting brackets holding the unit securely?
• Are there many scratches or is there much dirt on the installation gasket?
8.3 Replacing the Backlight
The LT unit’s backlight should NOT be replaced by the user.
Although the LT is equipped with a long-life, cold-cathode tube backlight, the
backlight will eventually need to be replaced.
Monochrome model: 25,000 hours (Approximately 2.8 years)
Color model: 36,000 hours (Approximately 4.1 years)
“Service life” refers to the period after which the brightness decreases to about
half the brightness of a new product — assuming continuous (24 hour/day) illumi-
nation at normal temperature.
For backlight replacement, please contact your local LT distributor.