NEC NDA-24300 manual Circuit card UP and extract

A

Extract all the line/trunk circuit cards from their mounting slots in the unit. Insert the cards back into their slots one after another and see if the dial tone is heard each time.

If DT is heard, check the next circuit card.

If DT is not heard, replace the circuit card with a spare.

END

FAULT REPAIR PROCEDURES

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

Extract all the line/trunk circuit cards from their slots.

Note: Set the MB switch of the line/trunk

circuit card UP and extract.

Confirm the MUX ACT lamp on the MUX circuit card illuminates.

Set the MB switch of an extracted Line/Trunk circuit card UP and insert the circuit cards into their mounting slots one by one.

Confirm the OPE lamp of the inserted circuit card illuminates by setting the MB switch DOWN.

Make a station-to-station call and see if dial tone can be heard.

Note: Perform this check on the reset of the circuit cards by inserting them into their slots individually.

NDA-24300CHAPTER 5

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Issue 1