NEC NDA-24300 manual End

FAULT REPAIR PROCEDURES

A

B

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

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

Perform the above check by extracting the MUX circuit cards individually.

When the PLO (PH-CK16/17/16-A/17-A) circuit card is mounted for digital interface, replace PLO circuit card with a spare and check.

Set the faulty speech path system to STBY side 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.

END

Set MB switch of the PLO circuit card to UP side.

Confirm OPE lamp on the PLO circuit card of the mate system illuminates.

Extract PLO circuit card from its mounting slot.

Set MB switch UP and insert the new PLO cir- cuit card into its mounting slot.

Set MB switch DOWN.

Set MB switch of the ACT-side PLO circuit card UP.

Confirm that the new PLO circuit card becomes the ACT side (OPE lamp on the new card lights green).

Set MB switch of the STBY side PLO DOWN.

Confirm that speech can be carried out normal- ly by a station-to-station call.

CHAPTER 5 NDA-24300

Page 350

Issue 1