AT&T MERLIN LEGEND Installation & Maintenance Manual page 515

Maintenance and Troubleshooting
2. If LEDs do not light, check the CU and wiring by using a
known good phone.
3. Move the T/P lever to its normal position.
Ringing tone should stop, and the LEDs should be off.
4. If any part of the test fails, replace the telephone.
Symptom:
Time appears on the display, but the incoming call
information does not.
Procedure:
Move the T/P lever on the side of the telephone to the center
position.
Voice Transmission Troubles
Symptom:
Telephone does not receive tones.
Procedure:
Check the CU and wiring with a known good telephone.
Single-Line Telephone Problems
Symptom:
Many single-line telephones cannot dial correctly even though
they are receiving calls.
Maintenance 5-37