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20 Chapter 2 Introduction
NN40050-118NN40050-118
Display Diagnostics menu
Use the Up/Down navigation keys on your IP Phone to scroll the diagnostics menu and to access
the following diagnostic operations for your IP Phone and expansion module.
• Full Contrast
• LED Test
• Character Test
Instructions are displayed in the LCDs of the IP Phone and the expansion module. The line/feature
key display areas are blank.
Full Contrast
The IP Phone and the expansion module display areas are set to maximum (dark) contrast,
including the line/feature key areas. All LEDs are off.
LED Test
The IP Phone and the expansion module LEDs are set to on. The display areas clear, including the
line/feature key display areas.
Character Test
The IP Phone and the expansion module LEDs are set to off. The available character set is
displayed across all writable areas of the display, including the line/feature key display areas. The
telephone on-hook icon is displayed for all line/feature keys.
Table 4 on page 20 shows the diagnostic operation on the IP Phone and the expansion module.
Table 4 Display diagnostic operation on the IP Phone and the expansion module
Diagnostic step IP Phone line/feature key LCD Expansion module LCD
Initial screen Blank Blank
Full Contrast Set to highest contrast Set to highest contrast
LED Test Blank Blank
Character Test Characters appear across the
display areas and the telephone
on-hook icon is displayed.
Characters appear across the display
areas and the telephone on-hook icon
is displayed.