Toshiba DK8, DK 16 manual Fault Classification, Table a, Flowcharts, Fault Clearing Procedures

1GENERAL

1.01This section describes the maintenance pro- cedures used to diagnose faults in the STRATA DK8 and DK16 digital key telephone system. Faults are classified and then cleared by replacing the malfunctioning unit and performing operational tests in the sequences prescribed by the fault clearing flowcharts in Paragraph 9.

2FAULT CLASSIFICATION

2.01A Fault Classification Flowchart is provided to ensure that fault clearing is pursued in a logical sequence (Chart No. 1).

2.02An 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.

2.03Faults and associated flowcharts in Table A are organized into the following categories:

	TABLE A
	FLOWCHARTS
Flowchart	Title
1	Fault Classification
2	Catastrophic Faults
3	Station Dial Tone Faults
4	CO Line Dial Tone Faults
5	DSS Console Faults
6	Voice Mail/(External) Auto Attendant
	(VM/AA) Faults
7	Station Message Detail Recording
	(SMDR) Faults
8	Remote Maintenance Faults

3FAULT CLEARING PROCEDURES

3.01Before 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.

IMPORTANT!

Many system features are assigned, en- abled or disabled using software entries

FAULT FINDING

SECTION 100-816-500

MARCH 1993

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.

3.02Initialize the system (Program 90, 92, and 03) before testing new systems or when in DK16 cases,, changing the KFCU, Feature cartridge (if instructions specify).

3.03Faults in the DK8 and DK16 are cleared by replacing PCBs, telephones (digital or electronic) or the power supply, as instructed in the flow- charts.

3.04Five symbols are used in the flowcharts, which are identified in Figure 1.

3.05The flowcharts are sequentially arranged to permit rapid fault localization within the system. All fault clearing must begin with the Fault Classifica- tion Flowchart, which is arranged in the correct

Marking points of a flowchart sequence.

Important notes affecting the fault clearing procedure.

Question to be answered

YES or NO.

Progression TO or FROM another flowchart location. Letters and numbers denote the exact entrance or exit points.

Statement of a required action.

FIGURE 1

FLOWCHART SYMBOLS

fault locating sequence.

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