Troubleshooting - Ericsson Dialog 4220 Lite User Manual

Troubleshooting

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Troubleshooting
If your phone is out of order, you can initiate a telephone self-test to
check whether there is a fault in the phone or in the system. For the
Dialog 4222 Office phone, you can also check the firmware revision
state of your phone.
To initiate a telephone self-test
Dialog 4220 Lite:
Press and hold simultaneously until a ring signal is heard.
All the key lamps on the phone should be switched on during the
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self-test to indicate that each key lamp is OK.
Press to exit.
Note: If you do not press
finished after about 30 seconds.
Dialog 4222 Office:
Press and hold simultaneously until a ring signal is heard.
The display shows the firmware revision state and
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 self-test 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
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line(s). The light frame around the display should be there.
Press to exit.
Note: If you do not press
finished after about 30 seconds.
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, the self-test is automatically
Selftest OK
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, the self-test is automatically
Dialog 4220 Lite/Dialog 4222 Office