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NDA-24300 CHAPTER 5
Page 359
Issue 1
FAULT REPAIR PROCEDURES
6.2 Control System Fault - Fault Occurs Intermittently
Faulty Situation:
• Fault occurs intermittently at ACT side in the dual configuration system.
• Fault occurs intermittently in the single configuration system.
• [0-C] ~ [0-K] CPU Failure
• [1-C] Both TSW Write Failure
• [1-D] TSW Write Failure
• [3-D], [3-E] Lock-Up Failure (Permanent/Temporary)
(1) For Dual Configuration
Replace ACT-side related circuit card
(CPU, GT, TSW, MUX, EMA) with a spare,
and check.
Replace the circuit cards (CPU, GT, TSW, MUX,
EMA) individually referring to the following sec-
tions in Chapter 4:
• Section 1.3.1, CPR Replacement Procedure
• Section 1.3.2, EMA Card Replacement
Procedure
• Section 2.3.1, GT Card Replacement
Procedure
• Section 2.3.2, TSW Card Replacement
Procedure
• Section 3.3.2, MUX Card Replacement
Procedure
Place the circuit card (CPU, GT, TSW, MUX)
into ACT mode individually by executing CPU or
Speech Path System changeover. 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 and identify a circuit card responsible
for the fault.
After all the steps are complete, place the whole
circuit card (CPU, GT, TSW, MUX examined
above) to the ACT mode. Refer to Section 12.1.6,
Manual System Changeover of Speech Path Sys-
tem, in Chapter 6.
When a fault is not indicated, set the
faulty system to STBY mode. Refer
to Section 12, System Control Pro-
cedures, in Chapter 6.
Check to see if a fault is indicated.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
START
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