NEC NDA-24300 manual Line Fault When Dial Tone DT Cannot Be Heard, Start

FAULT REPAIR PROCEDURES

1.3 Line Fault - When Dial Tone (DT) Cannot Be Heard

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

When OPE lamp on the LC circuit card does not illuminate

When BL lamp for each line is flashing or illuminating on the LC circuit card

A

Confirm MB switch of the LC circuit card is in ON position (UP).

Use ASDT command to confirm that station data in the LC circuit card is assigned.

Replace the LC circuit card with a spare.

Confirm MB switch of the LC circuit card is in ON position (UP side).

Use MBST command to confirm LC circuit card has not been placed into make-busy state.

Use ASDT command to check the station data assignment.

Replace the LC circuit card with a spare.

NDA-24300CHAPTER 5

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Issue 1