53SL ES Series Mobile Radio Operating Manual April 2009
4-5
Basic Operation
Section 4 - General Operation
4.1.4
Display Backlight Control
If the BKLHT option button is programmed, it can be used to select high, medium, or OFF
backlight modes. Otherwise, the keypad and display backlight is fixed in one of these
modes by programming. The backlight is totally disabled when the Surveillance mode is
programmed (see Section 5.10).
4.1.5
Display Viewing Angle & Contrast Adjust
If the display is difficult to read from the angle you normally view it, the viewing angle
can be adjusted as follows: Press and hold F2 and F6 to enter angle change mode. If you
do not rotate the select switch for three seconds, it times out and goes back to zone or
channel change.
Note
If the display appears blank or all icons are continuously displayed, the viewing angle is
probably improperly adjusted.