Toshiba strata CT Installation & Maintenance Manual page 269

Flowchart 8-4
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.
H
C
Strata CT I&M Manual October 2000
Exchange Line Dial Tone Faults
START
Repair as necessary.
Is the fault
4-1
cleared?
the faulty
Exchange lines
faulty Exchange
lines only in the
Base or Expansion
Cabinet?
Change the Base cabinet or test the
Strata CT common control PCB per the Faulty
Isolation section and initialise the system
(Prog. 91-9 and 03).
Retest.
cleared?
Yes
No
4-3
4-2
Locate
Yes
No
No
4-7
Are the
Yes
No
4-10 4-9
Is the
No
fault
Yes
Go to
4-5
Fault Finding
END
Change the PCB
and retest.
4-4
Is the
fault
cleared?
Yes
4-5
Replace the defective
unit and return it to the
repair center.
END
Change the expansion
unit and retest.
4-6
Is the
Yes
fault
cleared?
No
Call your technical
support group.
1882 CT I&M
Go to
4-5
8-11