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64 4600 Series IP Telephone Installation Guide
Adjusting the Contrast Control
Use this procedure to adjust the contrast setting on any telephone with a display.
1. While the telephone is on-hook and idle, press the following sequence of keys on the
telephone’s faceplate:
Mute 2 6 6 8 # (Mute C O N T #)
Note:
Note: Press the Mute button momentarily. Do not press this button while pressing other
keys/buttons. The 4630/4630SW IP Telephones and the 4690 IP Conference
Telephone do not have a dedicated Hold button. For all other 4600 Series IP
Telephones, pressing the Hold button instead of the Mute button also works.
All IP telephones except those without displays present the following text left-justified at the
top of the display:
where the number of chevrons (“>” characters) corresponds to the value of the
NVCONTRAST system variable.
2. To lower the contrast, press *. To increase the contrast, press 0.
If the contrast is already at the lowest or highest value when an asterisk or zero value is
selected, an error tone sounds. If a value different from the current value of NVCONTRAST
is entered, the display updates immediately and the number of chevrons change
accordingly.
3. Repeat Step 2 as needed until the desired contrast is reached. When the contrast is at the
desired level, press #.
If selected contrast is equal to the NVCONTRAST value, the procedure terminates. If a new
value was selected the following left-justified text displays:
4. Press the * button to terminate the procedure, or the # button to save the new value. If you
press the # button, all IP telephones except the 4601 display the following text:
All phones save the new value.
>>>>>>>>
*= - 0=+ #=OK
Save new value?
*=no #=yes
New value being saved