Nortel Meridian 1 Manual page 136

Page 132 of 144
Table 21
Troubleshooting M2000 Series Meridian Digital Telephones (Part 4 of 4)
Symptom
Key Expansion Module does not
work.
External Alerter does not work.
Note 1: If the pseudorandom pattern 511 data is idle, the telephone keypad dialing is inoperative. Use the
release key to clear this condition.
Note 2: If using an RS-232 cable to connect the MCA to an ADM3/5 terminal, be sure that pin 22 is
disconnected.
Note 3: Change the baud rate before changing the mode from synchronous to asynchronous.
Note 4: Some terminals may drop DTR with the break. If this happens, RELEASE is not displayed.
553-3001-215 Standard 12.00 January 2002
Add-on modules
Solution
1
2
3
4
1
2
3
4
5
Unplug and plug in the line cord.
Ensure that the transformer is plugged in or that the
closet power supply is connected.
Ensure that the power supply board is installed
properly.
Make sure that the ribbon cable connecting the
telephone and the Key Expansion Module is routed
properly and is not pinched.
Ensure that the External Alerter Board is installed
properly.
Check that connections between the alerting device
and the telephone connecting block are correct.
Make sure that the jumpers are placed on the pins on
the External Alerter Board as described in
Procedure 2 on page 122.
Ensure that the transformer is plugged in or the closet
power is connected.
Ensure that the power supply board is installed
properly.