Toshiba Strata DK 24, Руководство по установке и обслуживанию

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STRATA DK FAULT FINDING
SECTION 400-096-500
SEPTEMBER 1992
IMPORTANT!
Many system features are assigned, en-
abled or disabled using software entries
as described in Programming Procedures.
It is very important to verify that the sys-
tem programming is correct and func-
tional before troubleshooting the hard-
ware.
3.02 In new systems, or when the PCTU or PCTUS
PCB has been changed, the initialization proce-
dure must be performed before testing. The sys-
tem data stored on the original PCTU or PCTUS
will be protected from loss by the backup battery on
that PCB. Therefore, the initialization sequence
should not be performed if the original PCB is
reinstalled.
NOTE:
In this section all information relating to the PCTU PCB
applies to the PCTUS, PCTU1, PCTU2, PCTU3, and
PCTU4 unless otherwise stated.
3.03 Faults in the system are cleared by replacing
PCBs, telephones (digital or electronic) or the
power supply, as instructed in the flowcharts.
3.04 Five symbols are used in the flowcharts,
which are identified in Figure 1.
Progression TO or FROM
another flowchart location.
Letters and numbers denote
the exact entrance or exit
points.
Important notes affecting the
fault clearing procedure.
Start and end of a
flowchart sequence.
Question to be answered
YES or NO.
Statement of a required
action.
FIGURE 1—FLOWCHART SYMBOLS
1 GENERAL
1.01 This section describes the maintenance pro-
cedures used to diagnose faults in the STRATA
DK digital key telephone system. Faults are clas-
sified and then cleared by replacing the malfunc-
tioning unit and performing operational tests in the
sequences prescribed by the fault clearing flow-
charts in Paragraph 5.
2 FAULT CLASSIFICATION
2.01 A Fault Classification Flowchart is provided to
ensure that fault clearing is pursued in a logical
sequence (Chart No. 1).
2.02 An assumption is made in the flowcharts 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.
2.03 Faults and associated flowcharts in Table A
are organized into the following categories:
TABLE A
FLOWCHARTS
3 FAULT CLEARING PROCEDURES
3.01 Before attempting to clear any fault, ensure
that it is in the system and not caused by associ-
ated external equipment, such as wiring, MOH
source, etc.
Flowchart Title
Fault Classification
Power Faults
Station Faults
KSU Faults
CO Line Faults
Intercom Faults
DSS Console Faults
Speed Dial Faults
MOH, BGM, Page & Relay Faults
SMDR Faults
PSTU Faults
Door Phone Faults
TIE Line Faults
Remote Maintenance/TTY Faults 1
2
3
4
5
6
7
8
9
10
11
12
13
14