Toshiba Strata DK 16 Installation And Maintenance Manual page 239

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