atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems AT&T MLS-12D Phone Problem

None of buttons are working, no lights are on, and no dial tone when they are pressed.
However, I can receive incoming call on this phone.
When I press the CONF button, a number "4" would appear on the screen. When I press number "6", I can see number "64" appear on the screen and can hear continuous high pitch signal. Similary, when number "5" is pressed, I can see number "54" appears on the screen and also the high pitch sound.
When can go wrong? It was working perfectly yesterday and I did program the system using this phone. ( module 206E was replaced and system works fine afterwards)
NEED HELP PLEASE

Try this:

Plug the phone directly into the port on the telephone system.

If the phone works, check all wiring for the extension.

If the phone still does not function properly, connect a known working phone to the same port. If the problem is still there, then the port is bad.

Hi dexman
I plug in a MLS-12 phone to the same outlet and it works.
However, on the MLS-12D, I can see display of the date, day of week and time. When I unplug and replug same, I see number 4 appeared on the first line, then time on the second line, and after a few seconds, the date appeared on the first line and number 4 disappeared.
Anything I can do to the MLS-12D?

How many modules are included in this system? Does the system consist of a five-slot carrier or is is just a two-slot "clamshell" connector? If you have a five-slot carrier, what are the module versions (R1, R3.1, etc.)?

Replace the phone. It most likely has a bad Membrane in it. It has lived a long useful life.

Anything I can do to the MLS-12D?

Give it a decent burial.

-Hal

4th of July is right around the corner..oops, wrong country! Besides,whatever else 12D's are, their housings are sturdy, cherry bomb probably wouldn't have much affect. John C.