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CHAPTER 5 NDA-24300
Page 344
Issue 1
FAULT REPAIR PROCEDURES
4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over
Faulty Situation:
• The ACT side has become faulty and the system changeover has executed in the
dual configuration system.
• [4-S] MUX Ready Failure / [4-T] Both MUX Failure
• [23-Y] MUX Clock Failure
Check to see if the MUX (PH-PC36)
circuit card of the STBY side is making
poor contact.
If the connection is set up, set the
faulty system into STBY side.
Set the MB switch of the MUX circuit card
UP.
Extract the MUX 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 the MB switch of the MUX circuit card
UP and insert the circuit card into its
mounting slot.
Set the MB switch of the MUX circuit card
DOWN.
Set the faulty system to ACT side 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 to see if a station-to-station connection
can be set up within the faulty unit.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
START
A