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CHAPTER 5 NDA-24300
Page 350
Issue 1
FAULT REPAIR PROCEDURES
Check to see if a station-to-station connection
can be set up and identify a circuit card respon-
sible for the fault.
Perform the above check by extracting the
MUX circuit cards individually.
When the PLO (PH-CK16/17/16-A/17-A)
circuit card is mounted for digital interface,
replace PLO circuit card with a spare and
check.
Set MB switch of the PLO circuit card to UP
side.
Confirm OPE lamp on the PLO circuit card of
the mate system illuminates.
Extract PLO circuit card from its mounting slot.
Set MB switch UP and insert the new PLO cir-
cuit card into its mounting slot.
Set MB switch DOWN.
Set MB switch of the ACT-side PLO circuit
card UP.
Confirm that the new PLO circuit card becomes
the ACT side (OPE lamp on the new card lights
green).
Set MB switch of the STBY side PLO DOWN.
Confirm that speech can be carried out normal-
ly by a station-to-station call.
Set the faulty speech path system to STBY
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.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
A
END
B