Table Of Contents - AT&T Merlin 820 Service And Maintenance Manual

HOW TO USE THIS MANUAL
FIRST: Perform the Tests in the "BASIC TROUBLE TESTS"
Section
SECOND: Determine Whether the Trouble Is Constant or
THIRD: Describe the Trouble
FOURTH: Select the Correct Trouble Isolation
FIFTH: Perform the Trouble Isolation Procedure
Selected
SIXTH: Replace Faulty Components
AN OVERVIEW OF YOUR SYSTEM
BASIC TROUBLE TESTS
TESTS TO DETERMINE IF THE TROUBLE IS IN YOUR
SYSTEM
SYMPTOM-BASED TESTS
List of Symptom-Based Tests
A. Voice Terminal Does Not Ring
B. Cannot Make an Outside Call
C.
Trouble with Indicator Lights, Speaker, or Ringing
D.
Some Custom Features Do Not Work
E.
All Voice Terminals Have No Lights and No Dial Tone (Entire Sys-
tem Down)
F.
Voice Terminal Rings Constantly
GENERAL TESTS
IF TROUBLE REMAINS
HOW TO SELECT THE CORRECT PROCEDURE
TEST SEQUENCE
TROUBLE ON ONE VOICE TERMINAL
VOICE TERMINAL TEST
TEST A:
CONTROL UNIT TEST
TEST B:
VOICE TERMINAL CORDS AND CABLE TEST
TEST C:
2-LINE/5-TERMINAL EXPANSION MODULE
TEST D:
TEST
TROUBLE ON MORE THAN ONE VOICE TERMINAL
TEST A: CONTROL UNIT TEST
CONTENTS
Intermittent
Procedure
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2
2
2
2
3
3
9
9
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19
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25
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29
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39
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49
53
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