Turning Off the Backlight

This procedure applies only to 4600 Series IP Telephones with a display.

1. While the telephone is on-hook and idle, press the following sequence of keys on the faceplate of the telephone:

Mute 6 3 3 # (Mute O F F #)

NOTE: Press the Mute button momentarily. Do not press this button while pressing other keys/buttons. The 4630 and 4630SW IP Telephones and the 4690 IP Conference Telephone do not have a dedicated Hold button. For all other 4600 Series IP Telephones, pressing the Hold button instead of the Mute button also works.

The display backlight of the telephone (and any attached EU24BL button module) goes off immediately and the user interface is restored to its previous state.