User`s manual

Chapter 7 - Maintenance
GP-477R/577R Series User's Manual
7-4
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Important
7.3 Changing the Backlight
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Warning
Replacing the backlight is only possible with GP-577R Series units, which
use a CFL type flouresecent tube. The GP-577R series backlight is a long-
life type, however the actual life of the backlight unit will vary depending on
the GP's operating conditions.
GP577RT-BL00-MS (for the GP577RT) 40,000 hour life (appr. 4.6 years)
GP577RS-BL00-MS (for the GP577RS) 25,000 hour life (appr. 2.9 years)
Refer to the following data when ordering your GP unit's backlight.
• Whenever changing the Backlight, be sure the
GP's power cord has been disconnected and that
the unit is cooled down.
• When the GP's power cord is connected and the
GP is ON, high voltage runs through the wires in
the backlight area—do not touch them!
• When the GP's power has just been turned OFF,
the Backlight area is still very hot! Be sure to wear
gloves to prevent being burned.
• Be sure to change both backlights, i.e. the upper and the
lower units.
• Do not allow water, oil or handprints to be left on the tube,
since they can all reduce the backlight's life.
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n Items Required When Changing The GP's Backlight
uPhillips type screwdriver (no.2) for GP's rear cover attachment screws.
uPhillips type screwdriver (no.0) for backlight unit's metal cover.
uOne pair of clean (preferably new) cotton gloves.
(Also, a small container for placing the attachment screws may help to prevent
them from becoming lost or misplaced)