Toshiba STRATA DK14 Installation And Maintenance Manual page 628

Fault Finding
Fault Isolation Flowcharts
Flowchart 14-3
START
Replaceable Station
PCBs:
DK14: QCDU,
QSTU2
DK40i Base KSU:
KSTU2 and all PCBs
in the DK40i
Expansion Unit
DK424 or DK424i:
PEKU, PESU, PSTU,
RSTU, RDSU/RSTS,
14-12
Station Dial Tone Faults
Check station wiring
per the Station Cable
Continuity Check in this
chapter.
Repair if necessary.
Is the
faulty station on a
replaceable station
PCB?
No
3-3
Are the
faulty station(s)
only in the DK40i
Expansion KSU or only one
DK424 or DK424i
cabinet?
No
3-7
Replace the DK14 or DK40i
Base KSU. Or, test the DK424
or DK424i common control PCB
per the Fault Isolation section.
Initialize the
DK424/DK424i/DK40i system
(Prog: 91-9 and 03).
Retest.
Is the
fault
cleared?
Yes
Go to
3-4
3-1
Is the fault
Yes
cleared?
No
3-2
Yes
Replace the PCB
and retest
Is the fault
No
cleared?
Change the DK40i
Yes Expansion KSU and
retest or check the
3-5
cabinet power supply
per the RPSU280
power supply test.
Then replace the
DK424 or DK424i
cabinet
cleared?
Call your technical
support group.
No
END
3-8
Yes
Replace the defective
unit and return it to the
repair center
3-6
Is the
Yes
Go to
fault
3-4
No
Strata DK I&M 6/00
3-4
END
1881