User's Manual

CHAPTER 5 NDA-24300
Page 316
Issue 1
FAULT REPAIR PROCEDURES
1.5 Line Fault - When Bell Does Not Ring
Note:
If a circuit card is replaced because only one line is
faulty, no other lines in that circuit card can be used
until the replacement is complete.
Call the faulty station line by Station-to-
Station calling and check to see if the bell
of the telephone rings.
Replace the telephone set and check to see if
its bell rings.
Check the faulty line on the MDF. Isolate the faulty line to the in-house wiring
side and to the system side.
Connect the test telephone to the system side.
Call the faulty line by station-to-station
calling and check to see if the bell rings.
When the bell does not ring Replace the LC circuit card with a spare.
When the bell rings The in-house wiring side is faulty. Confirm
that the A wire is not short-circuiting with
ground.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
START
END