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
Page 1

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.
Page 2

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.
Page 3

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
Page 4

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

How to Use This Manual
WIRING PLAN C –
VOICE TERMINAL
USING MODULAR TERMINAL CORDS, TERMINAL EXTENSION
CORD(S), A JACK PANEL, AND 2.5–FOOT JUMPER CORDS
JACK
D8AF TERMINAL
EXTENSION
CORD
MODULAR
LINE
CORDS
D8W MODULAR
TERMINAL CORD
MODEL 820 CONTROL UNIT
PANEL NETWORK
INTERFACE
JUMPER
CORD
WIRING PLAN D – USING MODULAR TERMINAL CORDS AND TERMINAL
EXTENSION CORD(S)
MODEL 820 CONTROL UNIT
VOICE TERMINAL D8AF TERMINAL
EXTENSION
CORD MODULAR
LINE
CORDS
NETWORK
INTERFACE
D8W MODULAR
TERMINAL CORD
Figure 2—Typical Wiring Plans (contd)
Page 6

How to Use This Manual
WIRING PLAN E – USING MODULAR TERMINAL CORDS ONLY
MODEL 820 CONTROL UNIT
VOICE TERMINAL
D8W MODULAR
TERMINAL CORD
NETWORK
INTERFACE
MODULAR
LINE
CORDS
Figure 2—Typical Wiring Plans (contd)
Page 7/8

Basic Trouble Tests
BASIC TROUBLE TESTS
If your communications system malfunctions, these tests may help you rapidly
locate the cause of the trouble.
These tests are divided into three main sections:
1.
Tests to Determine if the Trouble Is in Your System: This section helps you
determine if the trouble is caused by local telephone company equipment or by
your communications system.
2.
Symptom-Based Tests: This section helps you to identify the causes of specific
common problems your system may encounter.
3.
General Tests: This section helps you to do further tests if the tests in the first
two sections did not identify the cause of your system’s problems.
If the appropriate tests do not help you find the trouble in your system, either go on
to “HOW TO SELECT THE CORRECT PROCEDURE” in this manual or call your
equipment supplier for help.
TESTS TO DETERMINE IF THE TROUBLE IS IN YOUR
SYSTEM
Your local telephone company is responsible for providing service from the tele-
phone company to the network interface. You are responsible for the operation of
your communications system and its connection to the network interface.
This shared responsibility means that problems must be isolated before they can be
solved. If problems are in your communications system, you must see that repairs
are made. If service problems are caused by trouble on the telephone network, your
local telephone company must make repairs.
Page 9

Basic Trouble Tests
Step 1. Determine the extent of the problem by placing a series of outside calls.
These outside calls should be placed from more than one voice terminal.
Be sure all of the outside calls are not placed from the same columns of
Voice Terminals jacks (jacks 10 though 14 is one column). See Figure 1.
Remember each voice terminal will have an intercom number that is the
same as the number of the voice terminal jack that it is connected.
IF
THEN
The trouble does NOT appear on
calls outside of your business,
The trouble does appear on outside
calls (on only one voice terminal),
The trouble is caused by some
component of your system. Go to
the “Symptom-Based Tests.”
The trouble is caused by some
component of your system. Go to
the “Symptom-Based Tests.”
The trouble does appear on outside Either the local telephone company
calls (on more than one voice ter- equipment or your system could be
minal),
the cause. Go on to Step 2.
Step 2.
Determine if you have a standard telephone with a modular cord/plug.
Note:
You may be using a standard telephone with a modular cord/plug
as a power failure transfer telephone. The power failure transfer
telephone is the telephone connected to the Type III Cartridge in
the control unit. The power failure transfer telephone can be
used for this test, but a Model 820 voice terminal cannot.
IF
You have a standard telephone
with a modular cord/plug (it must
also be compatible with the tone or
rotary dialing service provided by
the local telephone company),
You do not have a standard tele-
phone with a modular cord/plug
and cannot make an outside call,
You do not have a standard tele-
phone with a modular cord/plug
but you can make an outside call;
however, there is a problem after
you are connected with the person
you called (for example, conversa-
tion is not clear),
THEN
Go on to Step 3.
Go to the “Symptom-Based Tests”
section.
Go to the “General Tests” section.
Page 10

Basic Trouble Tests
Step 3. Remove the Modular Line Cord (D4CH) from the network interface. Fig-
ure 3 shows examples of what you will see at the network interface.
Note:
If at the network interface you are using a 267A2 Line Bridging
Adapter, remove it along with the modular line cord.
NETWORK
INTERFACE
(YOU WILL HAVE ONE
OF THE FOLLOWING)
RJ11
RJ14 TWO–LINE
ADAPTER
(267C)
ONE OF THESE MODULAR LINE
CORDS WILL BE REMOVED
UP TO 8
MODULAR
LINE CORDS
EIGHT–LINE ADAPTER
Figure 3—Types of Network Interface
Page 11

Basic Trouble Tests
Step 4.
Plug the cord of the standard telephone into the network interface (out-
side line) on which the trouble appeared and make an outward call using
the standard telephone. (Labels at the network interface or your system
directory will help you find the line with trouble.)
IF
THEN
The trouble appears on the stan- The trouble is caused by either the
dard telephone and an adapter adapter or local telephone com-
(either a two-line or eight-line
pany equipment.
adapter) is used at the network
interface, Go on to Step 5.
The trouble appears on the stan-
Trouble found. The trouble is
dard telephone and an adapter
caused by local telephone company
(either a two-line or eight-line equipment. Call the local tele-
adapter) is not used at the network phone company.
interface,
The trouble does not appear on the
The trouble is caused by your com-
standard telephone, munications system. Go on to the
“Symptom-Based Tests.”
Step 5.
Remove the standard telephone cord from the adapter.
Step 6.
Replace the suspected adapter with one known to be in good working
order, if available. Plug the cord of the standard telephone into the new
adapter and make an outward call.
IF
THEN
The trouble appears on the stan-
Trouble found. The trouble is
dard telephone, caused by local telephone company
eqipment. Call the local tele-
phone company.
The trouble does NOT appear on
Trouble found. The original
the standard telephone,
adapter is the cause.
Read the section on Maintenance
Exchange Procedures at the end of
this manual.
Page 12

Basic Trouble Tests
SYMPTOM-BASED TESTS
The symptom-based tests are designed to help you decide which system component
is causing the trouble. Find your symptom in the following list and perform the
corresponding test. If your symptom is not in the list, go to the “General Tests”
section.
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 System Down)
Voice Terminal Rings Constantly.
A.
Voice Terminal Does Not Ring
A.
B.
C.
D.
E.
F.
Step 1.
Step 2.
Step 3.
Step 4.
Check the volume control setting on the voice terminal. This control is
located on the left-hand edge of your voice terminal. Pushing the control
away from you should increase ringing volume. If you have Basic Service
only, skip to Step 4.
See if your voice terminal has a programmed Do-Not-Disturb button. If it
does, make sure Do-Not-Disturb is not active. If the green light is on
beside the Do-Not-Disturb button, press the button to deactivate the
feature.
Reprogram your line ringing assignments at the voice terminal. Your
voice terminal may have been programmed not to ring. (Refer to the
User’s Guide.)
If trouble persists, go on to the tests in “C. Trouble with Indicator Lights,
Speaker, or Ringing.”
Page 13

Basic Trouble Tests
B.
Cannot Make an Outside Call
Step 1.
If you have Basic Service only, go on to Step 2. If you have an optional
Type I Feature Cartridge, be sure the voice terminal is not restricted from
originating outward calls. To make sure the voice terminal is not res-
tricted, refer to the Administration Manual to remove outward call res-
trictions from the voice terminal. After you have removed the restriction,
pick up the handset and dial an outside number.
IF
THEN
The call is completed satisfac-
Trouble found and cleared. Test
torily, is complete.
The trouble remains, The voice terminal programming is
not the source of the trouble.
Go on to Step 2.
Step 2.
Check the Tone/Pulse switch on the control unit to make sure that it is
set correctly.
●
If your local telephone company is equipped for touch-tone dialing, set
the Tone/Pulse switch to Tone.
If your local telephone company is equipped for rotary dialing only, set
●the Tone/Pulse switch to Pulse.
If you do not know what type of signaling your system should send, find
out from your local telephone company and set the switch accordingly.
Then dial an outside line.
IF
THEN
The call is completed satisfac-
Trouble found and cleared. The
torily,
test is complete.
The trouble remains, Go to the “GENERAL TESTS”
section.
Page 14

Basic Trouble Tests
C. Trouble with Indicator Lights, Speaker, or Ringing
Step 1. Hold the
T/P switch on the left side of the voice terminal in the T (test)
position.
IF
THEN
All red and green lights flash The voice terminal operation
alternately and a tone sounds con-
appears to be normal. Since the
tinuously,
test is inconclusive, go on to the
“General Tests.”
The red and green lights appear Go on to the “General Tests” sec-
dim, tion to see if you need an auxiliary
power unit.
There is any other pattern of
The trouble is caused by either the
lights and tone; for example, all voice terminal, control unit, expan-
red and green lights flash alter-
sion module, or cord/cable connec-
nately but the tone does not sound tions between them.
at all or the tone does not sound
continuously. Another example is
Go on to Step 2.
that some red and green lights
flash alternately or the tone
sounds continuously,
Step 2. Unplug the voice terminal on which the trouble appears from its modular
terminal cord and switch it with a working voice terminal (see Figure 4).
The intercom number of the working voice terminal should be five greater
or five less than that of the voice terminal with trouble. (This is done to
make sure your voice terminals are connected to different expansion
modules.) Also, add to your notes the intercom numbers of the voice ter-
minals switched (for example, “voice terminal with trouble-Intercom 10,”
“voice terminal known to be working-Intercom 15”).
Page 15

Basic Trouble Tests
VOICE TERMINAL
(WITH TROUBLE)
CONTROL UNIT
JACK FIELD
VOICE TERMINAL
(WITHOUT TROUBLE)
Figure 4—Switching Voice Terminals
Step 3. Using the voice terminal known to be working, hold the
T/P switch in the
T (Test) position.
IF
THEN
The same trouble appears, The trouble is not caused by the
voice terminal. It may be caused
by the control unit, expansion
module, cords, or cables. Return
the voice terminals to their origi-
nal position.
Go on to Step 4.
The trouble does not appear,
Trouble found. It is caused by
the first voice terminal.
Read the section on Maintenance
Exchange Procedures at the end of
this manual.
Page 16