The self test function allows you to check whether each button on the phone is working.
1.Press the MENU button.
2.Use the up and down arrow keys to locate the option Advanced. Press the Select soft key.
3.Use the up and down arrow keys to locate the option Self Test. Press the Select soft key.
4.A summary of the software being run by the phone is displayed.
5.Press and hold the Test soft key. The lamps on all the buttons with lamps are lit. The whole display is black.
6.Release the Test soft key to end the self test.
7.When completed, press the Done soft key.
8.Press the Exit soft key to exit the menus.