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CHAPTER 5 NDA-24300
Page 336
Issue 1
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
Check by replacing the MUX (PH-PC36)
circuit card.
Replace the MUX circuit card referring to
Section 3.3.2, MUX Card Replacement
Procedure, in Chapter 4.
After replacement of the MUX
circuit card, make a station-to-
station call in the faulty unit and
see if speech is normal.
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 by replacing the TSW circuit card. Replace the TSW circuit card by referring to
Section 2.3.2, TSW Card Replacement
Procedure, in Chapter 4.
After replacement of the TSW
circuit card, make a station-to-
station call in the faulty unit and
see if speech is normal.
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.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
START
A