Ericsson 4220 User Manual

97

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.

í *4

All the key lamps on the phone should be switched on during the 

selftest to indicate that each key lamp is OK.

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Note: If you do not press 

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í *4

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 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.

#

Note: If you do not press 

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