Panasonic KX-DT635, Quick Reference Manual, Page: 18 / 32

4 Before Operating the Telephone
Speaker volume
While in a hands-free conversation
Press [ ] or [ ] to adjust the volume.
Handset/Headset volume
While using the handset or headset
Press [ ] or [ ] to adjust the volume.
* If you hear your own voice through the handset or headset, decrease the
volume.
Ringer volume
While receiving a call
Press [ ] or [ ] to adjust the volume.
While on-hook
Press [ ] to confirm current volume and Press [ ] or [ ] to adjust the volume.
LCD contrast
While on-hook
1. Press [ ]/[PAUSE/PROGRAM].
2. Enter .
3. Press [ ]/[ENTER].
4. Press [ ] or [ ] to adjust the LCD contrast (KX-DT635) or the LCD
backlight (KX-DT680).
5. Press [ ]/[ENTER].
6. Press [ ]/[CANCEL].
* Note for KX-DT680
• This setting adjusts the brightness of the LCD backlight instead of the LCD
contrast.
• The LCD backlight has a finite lifetime.
• The LCD backlight turns off for a moment every 4 hours, and then it turns on
again.
4 Before Operating the Telephone
18