NEC NDA-24300 manual Circuit card UP and extract

FAULT REPAIR PROCEDURES

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 Dial Tone (DT) is heard, check the next circuit card.

If DT is not heard, replace the cir- cuit card with a spare.

END

B

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

Place the MUX circuit card into ACT mode by flipping the MBR key on the active GT (PH- GT09) card. Refer to Section 12.1.6, Manual System Changeover of Speech Path System, in Chapter 6.

Check to see if a station-to-station connection can be set up to identify the circuit card respon- sible for the fault.

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 cir- cuit 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 DT can be heard.

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

NDA-24300CHAPTER 5

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