Panasonic KX-TD7685 - Wireless Digital Phone, Service Manual

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KX-TD7685
11.1.6. Adjustment for LCD Contrast
1. Insert battery in handset.
2. Keep to push "1","0","3","Power"keys simultaneously for 3 seconds or more, and release.
Confirm the "Test Mode" is started as shown in Fig 1.
3. Push into the joystick ,and go to menu screen (refer to Fig.2).
4. Select "LCD Contrast" and press OK (refer to Fig.3
note) The value is different for every handset.
5. Adjustment of upper limit (refer to Fig.4).
"Press joystick left" => Become light.
"Press joystick right" => Become dark.
6. Press OK (push into the joystick).
7. Press joystick down one time to select lower limit (refer to Fig.5).
note) The value is different for every hand
8. Check the contrast of lower limit.
9. Press power key and exit LCD contrast adjustment mode.
10. Press power key for 3 seconds or more for power supply OFF.