AT&T Merlin 820 Service And Maintenance Manual
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AT&T Merlin 820 Service And Maintenance Manual

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

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  • Page 1 AT&T MERLIN ™ COMMUNICATIONS SYSTEM SERVICE AND MAINTENANCE MANUAL MODEL 820...
  • Page 2 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...
  • Page 3 CUSTOMER PROVIDED Music Source Modular Terminal Cord (D8W) Modular Terminal Jack Paging Amplifier (103A) CUSTOMER PROVIDED 820A CONTROL UNIT 5-BUTTON VOICE TERMINAL DW8SE Cord Terminal Auto Adjunct Cord Dialer D4CH Modular (DSAC) Extra Alert Terminal Control Modular Line Cord (D4CH) Cord (D8W) Switch (Optional)

  • Page 4: Table Of Contents

    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...
  • Page 5 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...

  • Page 6: How To Use This Manual

    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.

  • Page 7: Second: Determine Whether The Trouble Is Constant Or

    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.

  • Page 8: Sixth: Replace Faulty Components

    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. 2.
  • Page 9 How to Use This Manual 2–LINE/5–TERMINAL EXPANSION MODULE (SEE NOTE) Cartridge Type I Model 820 Voice Terminals FEATURE PACKAGE 2 Power Warning Normal Admin. Area Code Toll Prefix Tone Pulse Cartridge Type II M1 M 2 BACKGROUND MUSIC PAGING MUSIC SIGNAL HOLD Tel.
  • Page 10 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 CORD NETWORK VOICE TERMINAL INTERFACE 103A MODULAR JACKS MODULAR LINE CORDS VOICE D8W MODULAR TERMINAL TERMINAL CORD CABLING...
  • Page 11 How to Use This Manual USING MODULAR TERMINAL CORDS, TERMINAL EXTENSION WIRING PLAN C – CORD(S), A JACK PANEL, AND 2.5–FOOT JUMPER CORDS JACK MODEL 820 CONTROL UNIT PANEL NETWORK D8AF TERMINAL VOICE TERMINAL INTERFACE EXTENSION CORD MODULAR LINE CORDS D8W MODULAR TERMINAL CORD JUMPER...
  • Page 12 How to Use This Manual WIRING PLAN E – USING MODULAR TERMINAL CORDS ONLY MODEL 820 CONTROL UNIT NETWORK INTERFACE VOICE TERMINAL MODULAR LINE CORDS D8W MODULAR TERMINAL CORD Figure 2—Typical Wiring Plans (contd) Page 7/8...

  • Page 13: Basic Trouble Tests

    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.
  • Page 14 Basic Trouble Tests Determine the extent of the problem by placing a series of outside calls. Step 1. 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).
  • Page 15 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.
  • Page 16 Basic Trouble Tests Plug the cord of the standard telephone into the network interface (out- Step 4. 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.) THEN The trouble is caused by either the...

  • Page 17: Symptom-Based Tests

    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.

  • Page 18: Cannot Make An Outside Call

    Basic Trouble Tests B. Cannot Make an Outside Call If you have Basic Service only, go on to Step 2. If you have an optional Step 1. Type I Feature Cartridge, be sure the voice terminal is not restricted from originating outward calls.

  • Page 19: Trouble With Indicator Lights, Speaker, Or Ringing

    Basic Trouble Tests C. Trouble with Indicator Lights, Speaker, or Ringing Hold the T/P switch on the left side of the voice terminal in the T (test) Step 1. position. THEN The voice terminal operation All red and green lights flash appears to be normal.
  • Page 20 Basic Trouble Tests VOICE TERMINAL (WITH TROUBLE) CONTROL UNIT JACK FIELD VOICE TERMINAL (WITHOUT TROUBLE) Figure 4—Switching Voice Terminals Using the voice terminal known to be working, hold the T/P switch in the Step 3. T (Test) position. THEN The trouble is not caused by the The same trouble appears, voice terminal.
  • Page 21 Basic Trouble Tests Go to the control unit and locate the Voice Terminals jack numbers that Step 4. are the same as the intercom numbers of the two voice terminals you have been using. Switch the cords that are connected to these two Voice Ter- minals jacks (see Figure 5).
  • Page 22 Basic Trouble Tests Using the voice terminal with the intercom number of the voice terminal Step 5. known to be working (see notes made in Step 2), perform the action that revealed the trouble. THEN The trouble is caused by either the The trouble persists, control unit or the expansion module inserted into the control...

  • Page 23: Some Custom Features Do Not Work

    Basic Trouble Tests D. Some Custom Features Do Not Work The most commonly used custom features are listed below: Outside Auto-Dial Intercom Auto-Dial Saved Number Redial Last Number Redial Do Not Disturb Privacy Automatic Answer Automatic Line Selection (idle line preference) Line Ringing Assignment Paging Feature Touch-Tone Enable...
  • Page 24 Basic Trouble Tests Go to a second voice terminal and program the feature on it. Step 3. THEN The trouble is caused by either the The feature works on the second first voice terminal or the control voice terminal, unit. Go on to Step 4.

  • Page 25: All Voice Terminals Have No Lights And No Dial Tone (Entire System Down)

    Basic Trouble Tests E. All Voice Terminals Have No Lights and No Dial Tone (Entire System Down) Determine if your control unit is connected to an auxiliary power unit. Step 1. THEN Skip to Step 13. You are NOT using an auxiliary power unit, You are using an auxiliary power Go on to Step 2.
  • Page 26 Basic Trouble Tests Step 3. Check to see if the auxiliary power unit is properly connected to the ac outlet. Then proceed according to the following: THEN Skip to Step 12. The light comes on, Go on to Step 4. The light does not come on, Make sure the ac outlet is supplying power.
  • Page 27 Basic Trouble Tests Step 9. Unplug the control unit power cord from the ac outlet and plug it into the AC Output outlet on the auxiliary power unit. Step 10. Plug the auxiliary power unit connector back into the control unit (see Figure 7).
  • Page 28 Basic Trouble Tests Step 13. Unplug the control unit from the ac power outlet and plug it in again. Also, if you are using a 3-prong extension cord to connect the control unit to the ac outlet, check the extension cord to make sure it is properly plugged into the control unit power cord.

  • Page 29: Voice Terminal Rings Constantly

    Basic Trouble Tests F. Voice Terminal Rings Constantly If your voice terminal rings constantly, check the position of the T/P switch located on the left side of the voice terminal. The T/P switch should be in the center posi- tion for proper operation of the voice terminal (see Figure 8). PROPER OPERATING POSITION TEST/PROGRAM SWITCH...

  • Page 30: General Tests

    Basic Trouble Tests GENERAL TESTS When the symptom does not appear in the Symptom-Based Tests listed above and when the cause of trouble has not yet been found, make the following general test of your system. Look at the red WARNING light in the upper left corner of the control Step 1.
  • Page 31 Basic Trouble Tests Determine if you have an auxiliary power unit or a voice terminal power Step 2. supply. THEN You have an auxiliary power unit, Go on to “HOW TO SELECT THE CORRECT PROCEDURE.” You do NOT have an auxiliary See note below.
  • Page 32 Basic Trouble Tests Make sure the voice terminal power supply is properly connected to the Step 3. 103A Modular Jack (it can also be connected to a terminal extension cord) and that power is being supplied from the ac outlet for the voice terminal power supply.

  • Page 33: If Trouble Remains

    Basic Trouble Tests Step 6. Perform the action that first revealed the trouble. THEN The voice terminal power supply The trouble remains, was not the source of the trouble. Go on to Step 7. Trouble found. It is caused by The trouble no longer appears, the voice terminal power supply.

  • Page 34: How To Select The Correct Procedure

    How to Select the Correct Procedure HOW TO SELECT THE CORRECT PROCEDURE This section explains how to determine which of the three trouble isolation pro- cedures to use. Before using this section you should: 1. Read “HOW TO USE THIS MANUAL” in this manual. 2.
  • Page 35 How to Select the Correct Procedure For example, if one voice terminal does not have dial tone, check the same outside line button on the other voice terminal to see if there is dial tone. THEN The same trouble appears on the Go on to Step 5.

  • Page 36: Trouble On One Voice Terminal

    Trouble on One Voice Terminal TROUBLE ON ONE VOICE TERMINAL Use this procedure only if the same trouble does not appear on the second voice ter- minal that you have checked. This procedure will help you find the cause of trouble that occurs on only one voice terminal.
  • Page 37 Trouble on One Voice Terminal VOICE TERMINAL (WITH TROUBLE) CONTROL UNIT JACK FIELD VOICE TERMINAL (WITHOUT TROUBLE) Figure 10—Voice Terminal Switch On both voice terminals, perform the action that revealed the trouble. Step 4. THEN The trouble is caused by some part The trouble appears on the voice of the voice terminal.
  • Page 38 Trouble on One Voice Terminal Decide whether the trouble is the quality of sound in the handset. (For Step 5. example, is there difficulty in hearing, being heard, or is there noise on the line?) THEN The trouble is in the quality of Go to Step 6 to find out what part of the voice terminal is causing sound,...
  • Page 39 Trouble on One Voice Terminal N–TYPE R–TYPE PLASTIC SLIT WIRE SCREEN Figure 11—Types of Handsets Switch the handset of the voice terminal with the trouble and the handset of the other voice terminal. Do not exchange handset cords (see Fig- ure 12).
  • Page 40 Trouble on One Voice Terminal On both voice terminals, perform the action that revealed the trouble. Step 7. THEN The handset is not causing the The trouble appears on the voice trouble. Replace the handsets as terminal on which it first they were and go to Step 8.
  • Page 41 Trouble on One Voice Terminal Step 9. On both voice terminals, perform the action that revealed the trouble. THEN Trouble found. It is caused by The trouble appears on the voice terminal on which it first the voice terminal body. appeared, Read the section on Maintenance Exchange Procedures at the end of...

  • Page 42: Test B: Control Unit Test

    Trouble on One Voice Terminal TEST B: CONTROL UNIT TEST Do this test only if the previous test indicated the trouble was not caused by the voice terminal. Go to the control unit and locate the Voice Terminals jacks for the voice Step 1.
  • Page 43 Trouble on One Voice Terminal Step 2. On both voice terminals, perform the action that revealed the trouble. THEN Trouble found. It is caused by The trouble appears on the voice wiring between the voice terminal terminal on which it first appeared, and the control unit.

  • Page 44: Test C: Voice Terminal Cords And Cable Test

    Trouble on One Voice Terminal TEST C: VOICE TERMINAL CORDS AND CABLE TEST Do this test only if the result of Test B indicated that the trouble was caused by the wiring. See if there is only one modular terminal cord between the control unit Step 1.
  • Page 45 Trouble on One Voice Terminal Step 3. On both voice terminals, perform the action that first revealed the trouble. THEN Trouble found. It is caused by The trouble appears on the voice the modular cord connected to the terminal that at first had no trou- voice terminal that now has the ble, trouble.
  • Page 46 Trouble on One Voice Terminal VOICE TERMINAL (WITH TROUBLE) 103A MODULAR JACKS JUMPER CONTROL UNIT CORDS JACK FIELD VOICE TERMINAL (WITHOUT TROUBLE) Figure 16—Switching Jumper Cords Switch the jumper cord of the voice terminal on which trouble appears Step 6. and the jumper cord of the voice terminal with no trouble (see Figure 16).
  • Page 47 Trouble on One Voice Terminal See if there are one or more terminal extension cords between the control Step 8. unit and the modular terminal cord of the voice terminal on which the trouble appears. Note: A modular terminal cord, with a 451A Adapter connected to one end, is the equivalent of a terminal extension cord in this step and in the following steps.
  • Page 48 Trouble on One Voice Terminal Step 10. On both voice terminals, perform the action that revealed the trouble. THEN Trouble found. It is caused by Some or all of the terminal exten- the terminal extension cord just sion cords have been switched and connected to the voice terminal the trouble appears on the voice that at first had no trouble.
  • Page 49 Trouble on One Voice Terminal Step 12. Inspect the wiring between the 103A Modular Jacks (Figure 18) or between the 103A Modular Jack and jack panel (Figure 19) for damage. CONTROL UNIT 103 MODULAR JACKS VOICE TERMINAL VOICE TERMINAL CABLE Figure 18—Wiring with Jacks and Cables CONTROL UNIT 103A MODULAR...
  • Page 50 Trouble on One Voice Terminal Step 14. Check the modular jack(s) to make sure there are no broken wires, that the wires are tightly inserted in their notches, that wires are not touching each other, and that the wires are inserted in the correct order. See Fig- ure 21.
  • Page 51 Trouble on One Voice Terminal SCREW CAPS Figure 20—Removing the Cover from a Jack CAPS WHITE–BLUE BLUE WHITE–ORANGE ORANGE WHITE–GREEN GREEN WHITE–BROWN BROWN Figure 21—103A Modular Jack Wiring Page 48...

  • Page 52: Test D: 2-Line/5-Terminal Expansion Module Test

    Trouble on One Voice Terminal TEST D: 2-LINE/5-TERMINAL EXPANSION MODULE TEST Do this only if other tests have determined that the trouble was caused by the control unit or the expansion module. Also, you will need more than one expansion module to perform this test.
  • Page 53 Trouble on One Voice Terminal At the group of Voice Terminals jacks that do not have terminal cords Step 7. connected to them (these are the jacks with the faceplate numbers of the expansion module with no trouble), connect a modular terminal cord to the jack that is on the same level as the terminal cord connected in Step 6.
  • Page 54 Trouble on One Voice Terminal Voice Terminals Normal Area Code Pulse Figure 23—Reconnecting Modular Terminal Cords Step 8. Place the control unit On/Off switch in the On position. If an auxiliary power unit is used, plug it back into the ac outlet. Step 9.
  • Page 55 Trouble on One Voice Terminal Warning: Remove control unit ac power (using the control unit On/Off switch) before inserting or removing a expansion module. If you are using an auxiliary power unit, unplug it from the ac outlet. Step 11. Switch the expansion modules back to their original position.

  • Page 56: Trouble On More Than One Voice Terminal

    Trouble on More Than One Voice Terminal TROUBLE ON MORE THAN ONE VOICE TERMINAL Use this procedure only if you found the same trouble on at least two voice termi- nals. If all of your voice terminals are dead, and you have read the section entitled “E.

  • Page 57: Test B: Modular Line Cords And Network Interface

    Trouble on More Than One Voice Terminal To determine where the trouble appears, compare your notes to the follow- Step 5. ing table. THEN Trouble found. It is caused by The trouble appears on intercom the control unit. calls only (on more than one voice terminal), Read the section on Maintenance Exchange Procedures at the end of...

  • Page 58: Network Interface

    Trouble on More Than One Voice Terminal NETWORK INTERFACE WITH ONE (1) LINE TO CONTROL UNIT LINE D4CH MODULAR LINE CORDS BRIDGING ADAPTER TO AUXILIARY DEVICE NETWORK INTERFACE WITH TWO (2) LINES TWO-LINE ADAPTER LINE 2 LINE 2 TO CONTROL UNIT LINE 1 LINE 1 TO CONTROL UNIT D4CH MODULAR LINE CORDS...
  • Page 59 Trouble on More Than One Voice Terminal From a voice terminal, try to make an outside call on the line with trou- Step 3. ble. THEN Skip to Step 7. The trouble is still present, Return the cords and line bridging The trouble is no longer present, adapter to their original position.
  • Page 60 Trouble on More Than One Voice Terminal Step 5. From a voice terminal, try to make an outside call on the line with trou- ble. THEN Trouble found. It is your auxili- The trouble is no longer present, ary device. Do not reconnect the device until the trouble has been corrected.
  • Page 61 Trouble on More Than One Voice Terminal MODULAR NETWORK LINE INTERFACE CORD POWER FAILURE TRANSFER TELEPHONE Figure 26—Unplugging the Cord from a PFTT B. At the control unit, unplug the modular line cord from the Tel. Co. Lines jack and plug it into the standard modular tele- phone.
  • Page 62 Trouble on More Than One Voice Terminal Step 9. Place an outside call using the standard modular telephone, and make a note of what happened. THEN The trouble is no longer present, The trouble is caused by the con- trol unit or the expansion module. Using Step 10, replace the cords as they were, then go to the “Tel.
  • Page 63 Trouble on More Than One Voice Terminal B. Remove the modular line cord from the network interface for the line with trouble. Connect the standard modular telephone to the net- work interface using the cord of the standard modular telephone (see Figure 29).
  • Page 64 Trouble on More Than One Voice Terminal Step 13. See if you have any Line Extension Cords (D4CE) connecting the modular line cord to the control unit. THEN Trouble found. It is caused by You do not have any line extension the modular line cord.
  • Page 65 Trouble on More Than One Voice Terminal 820 CONTROL UNIT D4CE LINE EXTENSION CORD NETWORK INTERFACE D4CH MODULAR LINE CORD STANDARD MODULAR TELEPHONE (POWER FAILURE TRANSFER TELEPHONE) Figure 30—Connections to Test Line Cords Step 15. Switch the modular line cord connected to the standard modular telephone and a line cord of the line with no trouble (see Figure 31).
  • Page 66 Trouble on More Than One Voice Terminal Using the standard modular telephone, perform the action that revealed Step 16. the trouble. THEN Trouble found. It is caused by The trouble is no longer present, the modular line cord. Replace the cords as they were and obtain a replacement for the defective cord.
  • Page 67 Trouble on More Than One Voice Terminal Step 19. Call your local telephone company to report the number(s) of the outside line(s) with trouble. You have now completed TEST B. Step 20. You should use this step only if you do not have a power failure transfer telephone or any other standard modular telephone.

  • Page 68: Test C: 2-Line/5-Terminal Expansion Module

    Trouble on More Than One Voice Terminal Step 23. From one voice terminal, try to make an outside call on each of the outside lines. THEN The trouble is caused by the con- The trouble appears on the same trol unit or the expansion module. outside line button as before, Put the modular cords back in their original position.
  • Page 69 Trouble on More Than One Voice Terminal Step 25. From one voice terminal, try to make an outside call on each of the outside lines which are switched. THEN The trouble is caused by local tele- The trouble appears on the same phone company equipment exter- line as Step 23, nal to your communications sys-...
  • Page 70 Trouble on More Than One Voice Terminal THEN Trouble found. It is caused by The trouble is no longer present, the modular line cord connected to the outside line with no trouble. Replace the cords as they were and obtain a replacement for the defec- tive cord.

  • Page 71: Voice Terminals Jack Test

    Trouble on More Than One Voice Terminal TEST C: 2-LINE/5-TERMINAL EXPANSION MODULE TEST Do this test only if other tests have determined that the trouble was caused by the control unit or the expansion module. The trouble must also appear on more than one voice terminal.
  • Page 72 Trouble on More Than One Voice Terminal Step 6. Connect the modular terminal cord back into one of the Voice Termi- nals jacks on which the trouble appears (see notes made in Step 1). The terminal cord label must match the Voice Terminals jack number. For example, if the problem appears on the voice terminal with intercom number 14, then the terminal cord will be connected to Voice Terminals jack 14 (see Figure 35).
  • Page 73 Trouble on More Than One Voice Terminal Voice Terminals Normal Area Code Pulse Figure 35—Reconnecting Modular Terminal Cords Place the control unit On/Off switch in the On position. If an auxiliary Step 8. power unit is used, plug it back into the ac outlet. Using the voice terminals of the two lines just connected to the Voice Step 9.
  • Page 74 Trouble on More Than One Voice Terminal Warning: Remove control unit ac power (using the control unit On/Off switch) before inserting or removing an expan- sion module. If you are using an auxiliary power unit, unplug it from the ac outlet. Step 11.

  • Page 75: Tel. Co. Lines Test

    Trouble on More Than One Voice Terminal Tel. Co. Lines Test This test should be performed when the trouble appears only on outside calls and when the trouble is caused by either the control unit or the expansion module. Add to your notes the Tel. Co. Lines jack letter (A through H) of the Step 1.
  • Page 76 Trouble on More Than One Voice Terminal TERMINAL CORD LABEL Cartridge Type I Voice Terminals Power Warning Normal Admin. Area Code Toll Prefix Cartridge Type II Tone Pulse Tel. Co. Cartridge Type III Lines TERMINAL CORD TO VOICE TERMINAL LINE CORDS TO NETWORK INTERFACE LINE CORD LABELS Figure 36—Connections to the Control Unit after the Expansion...
  • Page 77 Trouble on More Than One Voice Terminal Place the control unit On/Off switch in the On position. If an auxiliary Step 8. power unit is used, plug it back into the ac outlet. Using the voice terminal just connected to the Voice Terminals jack Step 9.

  • Page 78: Trouble On An Accessory

    Trouble on an Accessory TROUBLE ON AN ACCESSORY This procedure should be used only if the trouble appears on an accessory. If there is trouble with an accessory, see if there is an auxiliary power unit connected to the control unit Auxiliary Power socket. Also, see if there is a voice terminal power supply connected to a 34-button deluxe voice terminal (see Figure 38).
  • Page 79 Trouble on an Accessory AUXILIARY POWER CORD CONTROL AUXILIARY UNIT POWER UNIT POWER INPUT OUTPUT 3–PRONG AC OUTLET AUXILIARY POWER UNIT AC POWER CORD CONTROL UNIT AC POWER CORD Figure 37—Auxiliary Power Unit Connections Step 2. Make sure the accessory with trouble is connected properly. Count the number of voice terminals, hands-free units, and headset Step 3.

  • Page 80: Voice Terminal Power Supply

    Trouble on an Accessory Step 8. Perform the action that first revealed the trouble. THEN The auxiliary power unit is not the The trouble remains, source of the trouble. Go on to Step 9. Trouble found. It is caused by The trouble no longer appears, the auxiliary power unit.

  • Page 81: Terminal

    Trouble on an Accessory MODULAR JACK (103A) MODULAR TERMINAL CORD (D8W) CORD TO CONTROL (D6AP) ADAPTER UNIT (Z400F) 34–BUTTON DELUXE EXTENSION CORD VOICE TERMINAL (D8AF) OUTLET POWER SUPPLY (KS–22911, L11) Figure 38—Voice Terminal Power Supply Connections Disconnect the power supply from the ac outlet. Step 2.
  • Page 82 Trouble on an Accessory Go to three other voice terminals in your system and disconnect the modu- Step 6. lar terminal cords from the LINE jack (see Figure 39). "OTHER" "LINE" JACK JACK MODULAR VOICE TERMINAL TERMINAL (BOTTOM VIEW) HANDSET CORD (D8W) SYMBOL...

  • Page 83: Test B: For Accessories Attached To A Voice Terminal

    Trouble on an Accessory Step 11. Connect the modular terminal cord into the adapter. Step 12. Connect the power supply into the ac outlet. Step 13. Proceed to Test B for the accessory with trouble. TEST B: FOR ACCESSORIES ATTACHED TO A VOICE TER- MINAL Make certain that the accessory is securely plugged into the jack labeled Step 1.

  • Page 84: Test C: For Accessories Not Attached To A Voice

    Trouble on an Accessory TEST C: FOR ACCESSORIES NOT ATTACHED TO A VOICE TERMINAL Locate the appropriate test (on the following pages) for the accessory in trouble. Power Failure Transfer Telephone (PFTT) Caution: Disconnecting the control unit from the ac power outlet to test the PFTT will interrupt normal service to all outside lines.
  • Page 85 Trouble on an Accessory Unplug the PFTT from the Type III Cartridge (see Figure 40). Step 5. NETWORK INTERFACE STANDARD MODULAR STANDARD MODULAR (OR POWER FAILURE TELEPHONE TRANSFER) (POWER FAILURE TELEPHONE CORD TRANSFER TELEPHONE) Figure 40—Unplugging a PFTT from a Type III Cartridge At the network interface, unplug a modular line cord, then plug the cord Step 6.
  • Page 86 Trouble on an Accessory Lift the PFTT handset and try to make an outside call. Step 7. THEN Trouble found. It is either in The call is completed normally, your Type III Cartridge or in the control unit Type III Cartridge receptacle.
  • Page 87 Trouble on an Accessory Step 9. At the control unit, unplug a modular line cord from the Tel. Co. Lines jack and plug it into the PFTT (see Figure 43). MODULAR NETWORK LINE INTERFACE CORD POWER FAILURE TRANSFER TELEPHONE CORD POWER FAILURE TRANSFER TELEPHONE...

  • Page 88: Music-On-Hold Equipment

    Trouble on an Accessory Music-on-Hold Equipment Following the installation and testing instructions in the Customer Infor- Step 1. mation Brochure (CIB 2871) that came with your Type II Cartridge, check the music-on-hold installation. Step 2. Locate a substitute 8-ohm speaker (with wiring) known to be in working condition.

  • Page 89: Paging System

    Trouble on an Accessory Paging System Note: Your paging amplifier must be compatible with the Type II Car- tridge output of 500- to 700-ohm impedance at 0 to 10 dBm. Step 1. Using directions in your paging system manual, test whether your paging amplifier is operational.
  • Page 90 Trouble on an Accessory THEN Replace the wiring. Go on to Step A wiring defect is found (no sound heard), Skip to Step 7. A wiring defect is not found (sound heard), Attempt to page from a voice terminal. Step 6. THEN Trouble found.
  • Page 91 Trouble on an Accessory Note: The following test assumes that you have the same music source for music-on-hold and background music. Paging system is not working and: THEN Background music is OK. Music- Skip to Step 17. on-hold is either OK or not work- ing, Background music is not working.

  • Page 92: Extra-Alert Devices

    Trouble on an Accessory Using your paging system manual, check the operation of the entire pag- Step 12. ing system. If the paging system is working properly but the trouble remains, skip to Step 18. Step 13. Check the music source by doing Steps 2 though 5 in the “Music-on-Hold Equipment”...
  • Page 93 Trouble on an Accessory CONTROL UNIT TO EXTRA-ALERT BELL OR HORN 170A CARTRIDGE (TYPE III) EXTRA- ALERT JACK D4CH MODULAR LINE CORD Figure 45—Type III Cartridge and Extra-Alert Modular Line Cord Step 2. If your extra alert requires a separate 117-volt ac power supply, check that power is being supplied from the ac outlet.
  • Page 94 Trouble on an Accessory Step 3. If you have an optional ON/OFF switch (Wheelock KS-23053,L5) connected between your extra-alert device and the Type III Cartridge, make sure the ON/OFF switch is set to the proper ON position. The switch must be set to the ON position that corresponds with the extra-alert device you are using.
  • Page 95 Trouble on an Accessory CONTROL UNIT EXTRA-ALERT BELL OR HORN KS-23053, ON/OFF SWITCH 170A CARTRIDGE EXTRA-ALERT (TYPE III) BELL OR HORN EXTRA- ALERT JACK D4CH MODULAR LINE CORDS Figure 46—Bypassing ON/OFF Switch Locate a substitute extra-alert device known to be in working condition. Step 6.
  • Page 96 Trouble on an Accessory Step 10. Plug the substitute extra-alert device into the ac power outlet, if required. Step 11. Using a voice terminal, dial an outside call to the line with the substitute extra-alert device. THEN Trouble found. It is the original The substitute extra-alert device extra-alert device.

  • Page 97: Line-Powered Alerts

    Trouble on an Accessory Line-Powered Alerts Check the modular line cords between the network interface, line powered Step 1. ringer, and the control unit (see Figure 47). D4CH CONTROL UNIT MODULAR NETWORK LINE CORD INTERFACE 1 LINE LINE- POWERED ALERT 2 LINES (NOTE) D4CH...
  • Page 98 Trouble on an Accessory Step 2. At the control unit, switch the modular line cord plug of a line known to be working with the plug of the line cord connected to the line-powered alert (see Figure 48). SWITCH THE PLUGS OF THE MODULAR LINE CORDS HERE CONTROL UNIT TO NETWORK...
  • Page 99 Trouble on an Accessory Step 4. 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.
  • Page 100 Trouble on an Accessory CONTROL UNIT TO NETWORK INTERFACE LINE- POWERED ALERT SWITCH THESE MODULAR LINE CORDS TO NETWORK INTERFACE OF WORKING LINE Figure 49—Switching Line Cords to Test Line-Powered Alert Place a call using a voice terminal that has the telephone number of the Step 9.

  • Page 101: Maintenance Exchange Procedures

    Maintenance Exchange Procedures MAINTENANCE EXCHANGE PROCEDURES If you elect to do your own troubleshooting to isolate a faulty component of your Model 820, an exchange service is available so that you can obtain working replace- ments (see Note). This service is available for all systems purchased or leased from AT&T Information Systems.
  • Page 102 IMPORTANT TELEPHONE NUMBERS When you need HELP: Call your AT&T Information Systems toll-free HELP number 1-800-628-2888. When you call the help number, you may need the serial numbers of your system components. If you know the nearest AT&T Information Systems representative, write the name and telephone number here.
  • Page 103 MAINTENANCE EXCHANGE FORM I am returning the following defective equipment for exchange: ITEM DEFECT YOUR NAME YOUR PHONE NUMBER FIRM NAME* FIRM ADDRESS* *Name and address as found on your firm’s service/purchase contract. SHIP REPLACEMENT TO:...
  • Page 104 COMPONENT SERIAL NUMBERS Control Unit: Voice Terminals: Hands-Free Units: Headset Adapters: Extra-Alert Devices: Other:...
  • Page 105 AT&T Information Systems MERLIN is a trademark of AT&T © Copyright 1984 AT&T. Printed in U.S.A. Issue 1, June 1984 518-600-011 IS...

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