NEC NDA-24300 manual Line Fault When Bell Does Not Ring

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.

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

START

Call the faulty station line by Station-to- Station calling and check to see if the bell of the telephone rings.

Check the faulty line on the MDF.

When the bell does not ring

When the bell rings

END

Replace the telephone set and check to see if its bell rings.

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.

Replace the LC circuit card with a spare.

The in-house wiring side is faulty. Confirm that the A wire is not short-circuiting with ground.

CHAPTER 5 NDA-24300

Page 316

Issue 1