Toshiba Strata DK40 - Flowchart 9-4 Exchange Line Dial Tone Faults

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