KX-UDT111RU (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 22

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You can lock all keys other than the Navigator Key while the handset is in standby mode. One of 4 key lock types can be selected.
To lock

Press and hold 

 or the [CENTER] navigation key for more than 2 seconds to lock the handset keys.

The 

 icon will be displayed to indicate that the keys are locked.

To unlock the handset keys, press and hold 

 of the [CENTER] navigation key for more than 2 seconds. 

The 

 icon will change to 

 to indicate the keys have been unlocked.

• If you select "Manual&Password" or "Auto&Password" for Key lock type, you need to enter the password to unlock the handset.
• If no password has been set, you cannot select "Manual&Password" or "Auto&Password" for Key lock type.

You can select the language displayed on your handset.

1. Press  

or 

the [CENTER] navigation key.

2. Select " 

 Setting Handset" by pressing the arrow keys, and then press 

 .

3. Press 

 or 

 to select "Display Option", and then press 

 .

4. Press 

 or 

 to select "Language", and then press 

 .

5. Press 

 or 

 to select a language*1, and then press 

 .

*1 For a list of the languages than can be selected.

Within range of a Cell Station (CS)

(Blinking) Out of range

Off-hook Status

Phonebook

Voice Message

Incoming Call Log

Outgoing Call Log

Navigation Key Guidance

Full

Low

Needs to be charged