Flowchart 9-4 Exchange Line Dial Tone Faults - Toshiba Strata DK40 Installation & Maintenance Manual

Fault Isolation Flowcharts

Flowchart 9-4 Exchange Line Dial Tone Faults

START
1.
Check Exchange line wiring per
Chapter 4.
2.
Test Exchange line using a standard
telephone or butt set (or equivalent
piece of test equipment) at the NTP.
Repair as necessary.
4-1
Strata DK40 I&M Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Is the fault
cleared?
No
4-2
Are all
faulty Exchange
lines on a replaceable
PCB (not including KSU
motherboard)?
No
4-7
Are the
faulty Exchange
lines only in the DK40
Expansion KSU?
No
4-10
Change the DK40 Base KSU
and initialise the system
(Prog. 91-9 and 03).
Retest.
Is the
fault
cleared?
Yes
Go to
4-5
Yes
Change the PCB
4-3
Yes
No
Replace the defective
Yes
unit and return it to the
repair center.
Change the expansion
4-9
unit and retest.
No Call your technical
support group.
Fault Finding
END
Replaceable
Exchange Line
DK40 Base
and retest.
KSU:
DK40
4-4 Expansion
KSU
Is the
fault
cleared?
Yes
4-5
END
4-6
Is the
Yes
Go to
fault
cleared?
No
PCBs:
TCOU
TBSU
PCOU
PACU
RPTU
RBSU
PEMU
4-5
1882
9-11