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CHAPTER 5 Operation Procedure for System with PIR
4.4 UNIT FAULT
This section explains the fault repair procedure in a case where any of the faults shown in Table 5-6 has occurred
to all the line/trunk circuit cards mounted in a specific unit. Figure 5-6 shows the range of units.
Table 5-6 Unit Fault Situation
FAULT SITUATION REFERENCE SECTION
Noise, one-way speech, no tone.
Even if dialing has been made, dial tone does not stop.
Section 4.4.3, Unit Fault - Fault Related to
Speech
Dial Tone cannot be heard.
System Message “4-S”, “4-T” and “23-Y” is displayed.
Section 4.4.4, Unit Fault - When Dial Tone
(DT) Cannot Be Heard
MUX card has become faulty and, as a result the CPU has changed over.
System Message “4-S”, “4-T” and “23-Y” is displayed.
Section 4.4.5, Unit Fault - ACT-Side MUX
Card Is Faulty and System Has Changed Over
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