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FAULT FINDING
SECTION 100-816-500
MARCH 1993
-10-
CHART NO. 4
CO LINE DIAL TONE FAULTS
Replaceable CO Line
PCBs
DK8: QCDU
DK16 Base: KCOU
DK16 Expansion:
KCDU, PCOU
Is the
fault
cleared?
Go to
4-5
Call your technical
support group.
NO
YES
YES
Retest.
Change the DK8 or
DK16 Base KSU and
initialize the system
(Prog: 90, 92, 03).
Is the
fault
cleared?
Go to
4-5
4-7
NO
NO
Are the
faulty CO lines
only in the DK16
expansion
unit?
4-10
NOTE:
Program 03 is not used on DK8.
4-5
Is the
fault
cleared?
4-4
YES
START
Check CO line wiring
per section 100-816-008.
Test central office line
using a standard telephone
or butt set at the
TELCO block.
Is the fault
cleared?
4-1
4-2
END
NO
Repair as necessary.
Are all
faulty CO lines
on a replaceable PCB
(not including KSU
Main PCB )?
YES
Change the PCB
and retest.
4-3
YES
1.
2.
NO
Replace the defective
unit and return it to the
repair center.
END
4-9
YES
Change the expansion
unit and retest.
4-6