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FAULT FINDING
SECTION 100-816-500
MARCH 1993
-9-
CHART NO. 3
STATION DIAL TONE FAULTS
START
Check station wiring
per paragraph 8
of this section.
Repair if necessary.
Is the fault
cleared?
3-1
END
YES
Is
the
faulty station on a
replaceable station
PCB?
3-2
Replace the PCB
and retest
3-3
Replace the DK8 or
DK16 Base KSU and
initialize the system
(Prog: 90, 92, 03).
Is the
fault
cleared?
3-7
NO
Are the
faulty station(s) only
in the DK16 expansion
unit?
Retest.
Change the expansion
unit and retest.
3-5
YES
Is the
fault
cleared?
YES
3-6
END
Go to
3-4
Call your technical
support group.
NO
YES
NO
NO
NO
3-8
YES
Is the fault
cleared?
NO
YES
3-4
Replace the defective
unit and return it to the
repair center
Go to
3-4
Replaceable Station
PCBs
DK8: QCDU and
QSTU
DK16 Base: KSTU
DK16 Expansion:
KCDU, PDKU,
PEKU, PESU