Nortel M2000 Reference Manual page 56

Procedure 6 Enhanced digital port card failure
1 Check the MAP workstation for displayed error code.
Response: MADO Self Test completes. The test is over when
the handset is replaced, regardless of whether the test has been
completed.
2 Replace faulty components.
Response: MADO Self Test completes. The test is over when
the handset is replaced, regardless of whether the test has been
completed.
3 Try to establish a call.
Response: If the call attempt is unsuccessful, go to Procedure
1.
Procedure 7 Telephone (voice or dialing) failure
1 Check the line cord and handset cord to determine if all
TELADAPT connectors are firmly in place, and resecure if loose.
Response: Lift handset and listen for dial tone, or dial a
directory number, or both. If unsuccessful, proceed with Step 2.
2 Lift the handset, listen for dial tone, and dial a directory number.
Response: If unsuccessful, proceed with Step 3.
3 Wiggle the line cord, handset cord, or both while listening for
sounds from the handset. If crackling or ticking sounds occur,
replace the cord.
4 Try to establish a call.
Response: If unsuccessful, proceed with Step 5.
5 Replace the M2000 Digital Telephone.
6 Try to establish a call.
Response: If unsuccessful, proceed with Step 7.
7 Perform Procedure 6-8. If the test fails, try another port with the
same phone.
8 Try to establish a call.
Response: If unsuccessful, proceed with Step 9.
Meridian SL-100 M2000 Digital Telephone Reference Manual
Testing and maintenance 11