Troubleshooting

If you experience trouble, refer to the information in this section. If the problem persists, disconnect and then
reconnect the AC adaptor and/or Ethernet cable.
Before troubleshooting, confirm all connections (Page 97), and ensure that power is being supplied from the
Ethernet cable. If you are using an AC adaptor to supply power, ensure that the AC outlet the unit is connected
to is receiving power.

General Use

Issue Possible Cause & Solution
The display is blank.
The unit is still starting up.
While the unit is starting up, the display will be blank for a while.
Wait for the unit to finish starting up.
The display’s backlight is off.
Lift the handset or touch the display.
The unit does not respond to
operations or does not
operate as expected.
Some cables or cords are not connected correctly.
Check whether the connections are correct (Page 97). If some
connections are incorrect, disconnect all cables and cords and
then connect them again.
Your connection settings are incorrect.
Consult your administrator to confirm that your settings are correct.
The display is not shown well.
The screen’s brightness is set too low.
Adjust the display’s brightness (Page 110).
The ambient light sensor is covered by something.
Check that the ambient light sensor is not covered or blocked. If it
is, remove whatever is blocking it.
The previous screen is not
displayed even when I press
.
The Home screen is displayed.
You cannot go back from the Home screen. You must reopen the
screen you want to view again.
I forgot my password. Reinitialize the unit, and then set a password again. For details about
reinitializing the unit, consult your administrator or dealer.
The display of the date and
time is wrong.
This unit can retrieve the date and time from an NTP server. The NTP
server settings may be incorrect.
For details about NTP server settings, consult your administrator
or dealer. If the unit cannot connect to the NTP server, you can
also set the date and time manually (Page 116).
Changes to settings,
contacts, etc., were not
saved.
You answered a call while making changes.
If you answer a call before you finish making changes, the changes
you made up until then will not be saved. Make the necessary
changes again.
You moved to another screen while making changes.
If you move to another screen while making changes, those
changes may not be saved even if you press to return
to the previous screen. Make the necessary changes again.
122 Operating Instructions Document Version 2011-09
Troubleshooting