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NDA-24300 CHAPTER 5
Page 353
Issue 1
FAULT REPAIR PROCEDURES
5.3 Speech Path System Fault - When Dial Tone (DT) Cannot Be Heard
Faulty Situation:
• Dial Tone (DT) cannot be heard.
• [1-A] Both TSW Failure (Permanent)
• [1-E] Both TSW Clock Failure
• [4-C] Both TSW Ready Failure
• [23-Y] MUX Clock Failure
Note:
For dual system configuration, if a system message indicates that both systems are faulty, first repair
the fault in the indicated system and then proceed to repair the PIM in the other system.
Check to see if the TSW circuit card is
making poor contact.
Set TSW circuit card into STBY mode by flip-
ping 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.
Set TSW MBR switch on the TSW card UP.
Set MB switch of the TSW circuit card UP.
Extract the TSW 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 TSW MBR and MB switches on the TSW
circuit card UP and insert the circuit card into
its mounting slot.
Set MB switch of the TSW circuit card DOWN.
Set TSW MBR switch DOWN.
Check if a station-to-station connection can be
set up.
Check front cables. Check the front cables. (See Figure 5-8).
Initialize the system by pressing the START
button on the TOPU and see if a station-to-sta-
tion connection can be set up.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
START
END