User's Manual

NDA-24300 CHAPTER 5
Page 343
Issue 1
FAULT REPAIR PROCEDURES
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
circuit 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.
Make a station-to-station call and see if dial
tone can be heard.
Note:
Perform this check on the reset of
the circuit cards by inserting them
into their slots individually.
If DT is heard, check the next
circuit card.
If DT is not heard, replace the
circuit card with a spare.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
A
END