Chapter 8 - Fault Finding; Fault Classification; Fault Clearing Procedures - Toshiba strata CT Installation & Maintenance Manual

Fault Finding

Fault Classification

H

Fault Clearing Procedures

C
Strata CT I&M Manual October 2000
This chapter describes the procedures to diagnose faults in the Key Service Unit (KSU) in the
Strata CT systems. Faults are classified and then cleared by replacing the malfunctioning unit
and by performing operational tests in the sequences by prescribed by the fault clearing
flowcharts in "Fault Isolation Flowcharts" on Page
A Fault Classification Flowchart is provided to ensure that fault clearing is pursued in a
logical sequence (Flowchart 8-1 on Page
The flowcharts assume that the fault was discovered and reported by a digital or electronic
telephone user. All faults, therefore, are classified according to the way they would appear at
the digital or electronic telephone.
Before attempting to clear any fault, ensure that it is in the system and not caused by
associated external equipment, such as wiring, MOH source, etc.
Important! Many system features are assigned, enabled or disabled using software entries
as described in the Strata CT Programming Manual. It is very important to
verify that the system programming is correct and functional before
troubleshooting the hardware.
Initialise the system (Programs 91-9 and 03) before testing new systems or when changing
the KSU, or Strata CT processor PCBs.
8-7.
8-8).
8
8-1