NEC NDA-24300 manual Unit Fault Fault Related to Speech, Start

FAULT REPAIR PROCEDURES

4.2 Unit Fault - Fault Related to Speech

Faulty Situation:

•Noise, one-way speech, no tone, etc. occurs only within a unit.

•Even if dialing has started, dial tone does not stop.

(1)For Dual Configuration

START

ATTENTION

Contents Static Sensitive

Handling Precautions Required

A

Check by replacing the MUX (PH-PC36) circuit card.

After replacement of the MUX circuit card, make a station-to- station call in the faulty unit and see if speech is normal.

Check by replacing the TSW circuit card.

After replacement of the TSW circuit card, make a station-to- station call in the faulty unit and see if speech is normal.

Replace the MUX circuit card referring to Section 3.3.2, MUX Card Replacement Procedure, in Chapter 4.

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.

Replace the TSW circuit card by referring to Section 2.3.2, TSW Card Replacement Procedure, in Chapter 4.

Place the TSW 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.

CHAPTER 5 NDA-24300

Page 336

Issue 1