NEC NDA-24300 manual Start

FAULT REPAIR PROCEDURES

4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over

Faulty Situation:

•The ACT side has become faulty and the system changeover has executed in the dual configuration system.

•[4-S] MUX Ready Failure / [4-T] Both MUX Failure

•[23-Y] MUX Clock Failure

START

ATTENTION

Contents Static Sensitive

Handling Precautions Required

Check to see if the MUX (PH-PC36) circuit card of the STBY side is making poor contact.

If the connection is set up, set the faulty system into STBY side.

A

Set the MB switch of the MUX circuit card UP.

Extract the MUX circuit card from its mounting slot and clean the contact portion.

If cleaning cannot be done, repeat insertion and extraction of the circuit card two or three times.

Set the MB switch of the MUX circuit card UP and insert the circuit card into its mounting slot.

Set the MB switch of the MUX circuit card DOWN.

Set the faulty system to ACT 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.

Check to see if a station-to-station connection can be set up within the faulty unit.

CHAPTER 5 NDA-24300

Page 344

Issue 1