AT&T MERLIN 820 Installation and user guide

AT&T
MERLIN
™
COMMUNICATIONS SYSTEM
SERVICE AND
MAINTENANCE MANUAL
MODEL 820

SERVICE AND MAINTENANCE
MANUAL - MODEL 820
MERLIN™ COMMUNICATIONS SYSTEM
© Copyright 1984 AT&T
All Rights Reserved
Printed in U.S.A.
Issue 1, June 1984

CUSTOMER PROVIDED
Cord (D8W)
CUSTOMER PROVIDED
Auto
Dialer
Terminal
Adjunct Cord
(DSAC)
D4CH
Modular
Terminal
Modular Terminal Jack
(103A)
5-BUTTON
VOICE TERMINAL
DW8SE
Cord
Modular
Terminal
Cord (D8W)
Extra Alert
Modular Line Cord (D4CH)
Control
Switch
(Optional)
Manual Telephone
Accessory and
Modem Interface
10-BUTTON
VOICE TERMINAL
Hands-Free Unit
OR
Terminal
Adjunct Cord
(D8AC)
34-BUTTON
Headset Adapter
VOICE TERMINAL
820A CONTROL UNIT
Music Source
Paging Amplifier
JUMPER
CORDS
JACK FIELD
Modular
Terminal
Cord (D8W)
Terminal
Extension Cord
(D8AF)
Headset ANSWERING
MACHINE
OR
D4CH
Eight-
line
Adapter
MERLIN
™
COMMUNICATIONS SYSTEM
Modular
Line
Cord
Modular
(D4CH)
Line Cord
(D4CH)
POWER FAIL
TRANSFER
TELEPHONE
SET
EXTRA ALERT
(CARTRIDGE-POWERED)
Modular
CUSTOMER PROVIDED
Line Cords
(D2R)
Line
Bridging
Adapter
(267A2)
Two-Line
Adapter (267C)
LINE-POWERED
EXTRA ALERT
RJ21C: 8 lines RJ11C: 1 line RJ14C: 2 lines
per connector per jack per jack
NETWORK INTERFACES

CONTENTS
HOW TO USE THIS MANUAL
FIRST: Perform the Tests in the “BASIC TROUBLE TESTS”
Section
SECOND: Determine Whether the Trouble Is Constant or
Intermittent
THIRD: Describe the Trouble
FOURTH: Select the Correct Trouble Isolation
Procedure
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
A.
B.
C.
D.
E.
SYMPTOM-BASED TESTS
List of Symptom-Based Tests
Voice Terminal Does Not Ring
Cannot Make an Outside Call
Trouble with Indicator Lights, Speaker, or Ringing
Some Custom Features Do Not Work
All Voice Terminals Have No Lights and No Dial Tone (Entire Sys-
13
13
13
14
15
19
tem Down)
Voice Terminal Rings Constantly
21
25
F.
GENERAL TESTS
IF TROUBLE REMAINS
HOW TO SELECT THE CORRECT PROCEDURE
TEST SEQUENCE
TROUBLE ON ONE VOICE TERMINAL
TEST A:
TEST B:
TEST C:
TEST D:
VOICE TERMINAL TEST
CONTROL UNIT TEST
VOICE TERMINAL CORDS AND CABLE TEST
2-LINE/5-TERMINAL EXPANSION MODULE
TEST
TROUBLE ON MORE THAN ONE VOICE TERMINAL
TEST A:
CONTROL UNIT TEST
- i -
1
1
2
2
2
2
3
3
9
9
26
29
31
31
33
33
39
41
49
53
53

TEST B: MODULAR LINE CORDS AND NETWORK INTERFACE
TEST
TEST C: 2-LINE/5-TERMINAL EXPANSION MODULE
TEST
Voice Terminals Jack Test
Tel. Co. Lines Test
TROUBLE ON AN ACCESSORY
TEST A: FOR AUXILIARY POWER DEVICES.
Auxiliary Power Unit
Voice Terminal Power Supply
TEST B: FOR ACCESSORIES ATTACHED TO A VOICE
TERMINAL
TEST C: FOR ACCESSORIES NOT ATTACHED TO A VOICE
TERMINAL
Power Failure Transfer Telephone (PFTT)
Music-on-Hold Equipment
Paging System
Extra-Alert Devices
Line-Powered Alerts
MAINTENANCE EXCHANGE PROCEDURES
54
68
68
72
75
75
75
77
80
81
81
85
86
89
94
99
- ii -

How to Use This Manual
HOW TO USE THIS MANUAL
If you place an outside call using your voice terminal and cannot be heard, cannot
hear, or you hear static on the line; hang up and try to place the call again before
trying to locate the trouble.
The trouble locating procedures in this manual have been designed so that you can
easily locate a
component causing trouble in your small business communications
system (Model 820). Also, the trouble locating procedures help you identify and
correct any problem in your system that is caused by incorrect use of certain system
features. When using this manual, you should first read this section completely;
then perform the tests described in the “BASIC TROUBLE TESTS” section.
If you have questions concerning any information contained in this manual, please
call your equipment supplier for help.
For your convenience, the instructions for identifying a cause of trouble are divided
into the following sections:
●
Basic Trouble Tests
●
How to Select the Correct Procedure
●
Trouble on One Voice Terminal
●
Trouble on More than One Voice Terminal
●
Trouble on an Accessory
●
Maintenance Exchange Procedures.
Before trying to isolate a trouble, you should read this section completely.
At all times, you must:
● Follow the instructions carefully.
●
Conduct tests in the specified order.
To use this manual, you do not need special skills in troubleshooting or electronics.
But you will need to do the following.
FIRST:
Perform the Tests in the “BASIC TROUBLE TESTS” Sec-
tion
When trouble is detected, you should first perform the tests described in the
“BASIC TROUBLE TESTS” section of this manual. These tests give you the simple
tests that may be performed on your communications system. If the cause of the
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How to Use This Manual
trouble is not found when you have completed these tests, go to “HOW TO SELECT
THE CORRECT PROCEDURE” section in this manual to continue your attempt to
find the cause of the trouble.
SECOND:
Determine Whether the Trouble Is Constant or Inter-
mittent
If the cause of the trouble was not found by performing the basic trouble tests, you
should find out whether it is always present or whether it is intermittent. For
example, if there is noise on an outside call, place the outside call again to see if the
noise is still present.
If the trouble comes and goes, you have an intermittent problem. Locating the
cause of intermittent trouble is hard because it may not last long enough for you to
complete the trouble isolation procedures. If the trouble keeps coming and going,
call your equipment supplier for help.
THIRD:
Describe the Trouble
If the problem is not intermittent but persists, describe it on paper. Include the fol-
lowing information:
The intercom number(s) of the voice terminal(s) on which the trouble appears
●
(the intercom numbers range from 10 to 29).
The telephone number(s) of the line button(s) on which the trouble appears, or
●
the label of the feature button which seems to be causing the trouble. For exam-
ple, if the trouble appears while you are trying to make an intercom or outside
call, write “intercom” or the number of the outside line button from which you
are calling.
● The kind of trouble. For example, write down “noise on the line,” “light does not
come on by the INTERCOM button,” “cannot interrupt dial tone,” or “HOLD
button does not work.”
FOURTH:
Select the Correct Trouble Isolation Procedure
After describing the trouble on paper, follow the steps in the section labeled “HOW
TO SELECT THE CORRECT PROCEDURE.” This explains which procedure to fol-
low for finding faulty components such as voice terminals, cartridges, modular
cords, or adapters.
FIFTH:
Perform the Trouble Isolation Procedure Selected
When you have determined which trouble isolation procedure to use (either Trouble
on One Voice Terminal, Trouble on More than One Voice Terminal, or Trouble on an
Accessory), perform that procedure to locate the faulty component. If you are
unable to locate the faulty component, call your equipment supplier for help.
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How to Use This Manual
SIXTH:
Replace Faulty Components
When you locate the faulty component, you can replace it with one that works prop-
erly. If you have a maintenance contract, it will specify whether you should:
1.
Order a replacement component.
or
2.
Return the component to an Exchange Center for replacement.
components.
If you do not have an on-site maintenance contract, the Maintenance Exchange Pro-
cedures section at the end of this manual will explain how to obtain replacement
AN OVERVIEW OF YOUR SYSTEM
Your system may include all of the following components. Each component is
replaceable.
●
●
●
●
●
Voice terminals, including the handset, the handset cord, and the voice termi-
nal body.
Wiring between the voice terminal and the control unit, and between the control
unit and the network interface. The wiring includes all modular cords, cables,
adapters, modular to modular connectors, and 103A Modular Jacks.
Accessories, including power failure transfer telephones, headset adapters,
hands-free units, equipment for music-on-hold, paging, extra alerts, voice termi-
nal power supply, and auxiliary power unit.
Control unit, including feature cartridge(s) and expansion modules (see Fig-
ure 1).
Network interface, the point at which local telephone company equipment is
connected to your small business communications system. Clearing trouble at
the network interface or outside your system is the responsibility of the local
telephone company.
These components are usually connected in one of the five wiring plans in Figure 2.
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How to Use This Manual
2–LINE/5–TERMINAL
EXPANSION MODULE (SEE NOTE)
Model 820
Warning
Power
Admin.
Toll Prefix
Tone
Normal
Area Code
Pulse
T R1 2M1 M2
ON OFF
PAGING
SIGNAL
BACKGROUND
MUSIC MUSIC
ON
HOLD
Off
On
Voice
Terminals
10
11
12
13
14
Tel. Co.
15
16
17
18
19
Lines
A
B
C
D
20
21
22
23
24
25
26
27
28
29
E
F
G
H
Cartridge Type I
FEATURE PACKAGE 2
Cartridge Type II
Cartridge Type III
POWER FAIL LINES EXTRA ALERT
AB
NOTE:
Each 2-Line/5-Terminal expansion module gives you the capability to connect and use two outside lines and
five voice terminals. One expansion module is shipped with each control unit; therefore, to have more than
two outside lines and five voice terminals connected to your system, you must order additional expansion
modules. The control unit can handle up to four expansion modules.
Figure 1—Knowing Your Control Unit
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How to Use This Manual
WIRING PLAN A – USING MODULAR TERMINAL CORDS, VOICE
TERMINAL CABLING, MODULAR JACKS, AND
2.5–FOOT JUMPER CORDS
JUMPER
MODEL 820 CONTROL UNIT
VOICE TERMINAL CORD
NETWORK
103A MODULAR INTERFACE
JACKS MODULAR
LINE
CORDS
D8W MODULAR
VOICE
TERMINAL CORD TERMINAL
CABLING
WIRING PLAN B –
USING MODULAR TERMINAL CORDS, CABLE EXTENSION
KITS (THIS KIT CONTAINS A 100– OR 200–FOOT
SINGLE–ENDED CABLE AND A MODULAR JACK). A JACK
PANEL, AND 2.5 FOOT JUMPER CORDS
MODEL 820 CONTROL UNIT
JACK
VOICE TERMINAL PANEL
103A MODULAR
JACK
NETWORK
INTERFACE
MODULAR
LINE
CORDS
DW8A–SE
D8W MODULAR SINGLE–ENDED JUMPER
TERMINAL CORD
CABLE
CORD
Figure 2—Typical Wiring Plans
Page 5