AT&T MERLIN LEGEND Installation & Maintenance Manual page 225

Installation
To test a fixed-feature button with one LED, press the button.
4.
The Feature and HFAI LEDs should go off. The first press of
the Speaker button should turn off the Mute LED. The
second press of the Speaker button should turn off the
Speaker LED.
Note: If the Mute button has been pressed before the
Speaker button, the Mute LED cannot be turned off; it will
wink.
Press the fixed-feature buttons repeatedly to toggle the LEDs
5.
on and off.
6. To test the red Message light, press either a fixed-feature
button without an LED (such as Transfer or Drop) or any
dialpad button.
The Message LED should go off.
Press the fixed-feature or dialpad button repeatedly to toggle
7.
the Message LED on and off.
Hang up the handset to leave test mode.
8.
Test the MLX Telephones with a
Display
While the telephone is in the test mode, follow these steps to test
the display buttons:
1. Press the labeled display buttons (Home, Menu, lnspct, and
More).
The display should spell out these button labels.
2. Press the unlabeled display buttons.
The display should spell out Display Button and the
number of the button pressed (1 - 4).
System Acceptance Test 3-117