Ericsson DIALOG 4220 - Manual (Page 97)

97 Dialog 4220 Lite/Dialog 4222 Office
Troubleshooting
Troubleshooting
When something does not work properly, you can initiate a
telephone selftest to check if your telephone set is in order, or if the
fault is in the system. For the Dialog 4222 Office phone, you can
also check the firmware revision state of your phone.
To initiate a telephone selftest
Dialog 4220 Lite: í *4
Press and hold simultaneously until a ring signal is heard.
All the key lamps on the phone should be switched on during the
selftest to indicate that each key lamp is OK. #
Press to exit.
Note: If you do not press
#
, the selftest is automatically
finished after about 30 seconds.
Dialog 4222 Office: í *4
Press and hold simultaneously until a ring signal is heard.
The display shows the firmware revision state and
Selftest OK
for a few seconds. If there is something wrong, a fault message
appears. Inform your system administrator about the fault
message.
All the key lamps on the phone (and connected extra key panel)
should be switched on during the selftest to indicate that each key
lamp is OK.
After a few seconds the display is checked (the display is
completely dark). The display is OK when there are no light dot(s) or
line(s). The light frame around the display is supposed to be there. #
Press to exit.
Note: If you do not press
#
, the selftest is automatically
finished after about 30 seconds.