AT&T MERLIN LEGEND Installation & Maintenance Manual page 488

Maintenance and Troubleshooting
3. Run demand tests on the line/trunk and station modules to
further isolate the trouble.
4. If replacing the faulty equipment does not solve the problem,
use the screen menus to find the hardware vintage, the
software vintage, and the ROM ID of the modules.
5. Refer the problem to the NTSC.
Using the Maintenance Screens
Using the maintenance screens involves selecting items on
menus. The menu selections are identical whether you are using
an MLX-20L telephone or a PC. The only difference is that the
function keys on the computer keyboard simulate the display
buttons on the telephone.
In the following procedures, a representation of the menu screen
is shown with the actions to take. To enter maintenance
programming, press the button for "Menu" and then the button for
"Maintenance." The following main menu appears:
Maintenance:
Make a selection
System
Slot
Port
Exit
Note: On the maintenance screens, the power supply modules
are not shown and the processor module is numbered "00."
System Screens
System screens are used for getting information; you cannot alter
anything with system screens.
5-10 Maintenance