User's Manual

NDA-24300 CHAPTER 5
Page 341
Issue 1
FAULT REPAIR PROCEDURES
Place the MUX circuit card into ACT mode 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 to identify the circuit card respon-
sible for the fault.
Extract all the line/trunk circuit cards from
their mounting slots in the unit. Insert the
cards back into their slots one after another
and see if the dial tone is heard each time.
Extract all the line/trunk circuit cards from their
slots.
Note:
Set the MB switch of the line/trunk
circuit card UP and extract.
Confirm the MUX ACT lamp on the MUX cir-
cuit card illuminates.
Set the MB switch of an extracted line/trunk
circuit card UP and insert the circuit cards into
their mounting slots one by one.
Confirm the OPE lamp of the inserted circuit
card illuminates by setting the MB switch
DOWN.
If Dial Tone (DT) is heard, check
the next circuit card.
Make a station-to-station call and see if DT can
be heard.
Note:
Perform this check on the rest of the
circuit cards by inserting them into
their slots individually.
If DT is not heard, replace the cir-
cuit card with a spare.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
A
END
B