Table Of Contents - IBM 3274 51C Maintenance Information

Contents
Chapter
1.
Introduction 1-1
1.1 General . 1-1
1.2 Maintenance Approach 1-1
1.3 Field Replaceable Unit (FRU) Locations 1-2
1.3.1 Machine Model Number 1-2
1.3.2 0IA-Al Logic Board 1-2
1.3.3 Card Numbers 1-2
1.3.4 Operator Panel 1-2
1.3.4.1 IML Options 1-2
1.3.4.2 Indicators (8 4 2
1)
1-3
Chapter 2. Subsystem Problem Isolation Procedure 2-1
Step 1 Using the Isolation Procedure 2-1
Step 2 Power Test 2-1
Step 3 Bus Test 2-1
Step 4 Internal Tests 2-3
Step 5 Device Adapters - Driver/Receiver 2-8
Step 6 Display Symbols (Category A Only) 2-12
Step 7 Operational Indicators (84 2 1) 2-14
Step 8 Host Attachment 2-15
Step 9 Voltage Checks 2-15
Step 10 Verification Test 2-15
Step 11 Last Option 2-15
Chapter 3. Maintenance Analysis Procedures (MAPs) 3-1
3-1 General 3-1
3.2 Contents 3-1
MAP AI0, Bus Test 3-2
MAP A20, Control Logic Failure 3-7
MAP A40, Diskette Failure 3-11
MAP A50, Type A Adapter Failure Code 3-17
MAP A90, Device Adapter Type B 3-20
MAP A100, Machine Checkout 3-22
MAP A 120, Power Problem, Indicator On or Off 3-24
MAP A 122, Power On Indicator is Off and Fan Not
Turning 3- 36
MAP Al30, I.M. 2400,4800,9600 Failure 3-42
MAP AlSO, Installation/Customization Problems 3-47
Chapter 4. Removal and Replacement Procedures 4-1
4.1 Machine Access - Cover Removal/CE Manuals 4-2
4.2 Machine Access - Board/TSR Supply 4-3
4.3 Card Removal and Replacement 4-4
4.4 Internal Cable/Connector, Removal and Replacement 4-4
4.5 Prime Power Box, Removal and Replacement 4-5
4.6 Prime Power Transformer, Removal and Replacement 4-6
4.7 Fan Assembly, Removal and Replacement 4-7
4.8. Diode Assembly, Removal and Replacement 4-8
4.9 Input Filter Capacitor, Removal and Replacement 4-9
4.10 TSR Power Supply, Removal and Replacement 4-10
4.11 I/O Panel - Driver/Receiver, Removal and
Replacement 4-11
4.12 Diskette Drive, Removal and Replacement 4-12
4.13 Line Plate Card, Removal and Replacement 4-13
4.14 Operator Panel/Indicator Card, Removal and
Replacement 4-14
4.15 Logic Board, Removal and Replacement 4-15
4.16 Operator Panel Switches, Removal and Replacement 4-16
Chapter S. Communications Reference Data 5-1
5.1 Communications Facilities 5-1
5:1.1 3274 Models SIC and 52C SDLC 5-1
5.1.2 3274 Model SIC BSC 5-1
5.1.3 3274 Models SIC and 52C Modes/Speeds 5-1
5.1.4 Communication Adapters 5-1
5,2 Communications Attachments 5-1
5.2.1 External Modem EIA/V.35 5-1
5.2.2 Integrated Modem (1200 bps) 5-1
5.2.3 Integrated Modem (1200 bps) Wrap 5-4
5.2.4 Integrated Modems (2400, 4800, and 9600 bps),
Model51C 5-4
5.2.5 DDS Adapter 5-4
5.2.6 Loop 5-4
5.2.7 X.21 Nonswitched 5-4
5.2.8 X.21 Switched 5-4
5.3 Wrap Test 5-13
5.3.1 Modem Wrap Test 5-13
5.3.2 Wrap Test without Attached Modem (X.21 and EIA or
V.35 without Clock) 5-13
5.3.3 Loop Wrap Test 5-14
5.3.4 Loop Indicators 5-14
5.4 2400-,4800-, and 9600-bps Integrated Modems 5-14
5.4.1 2400-bps Integrated Modem (Feature Code 5640) 5-14
5.4.2 4800-bps Integrated Modem (Feature Code 5740) 5-14
5.4.3 9600-bps Integrated Modem (Feature Codes 5480 and
5842) 5-14
5.4.4 Line Attachments 5-14
5.4.4.1 Multipoint Network Operating Speed 5-14
5.4.4.2 Point-to-Point Network Operating Speed 5-14
5.4.4.3 Signal Quality 5-18
5.4.4.4 Speed Control Backup 5-18
5.4.4.5 Operate Indicator 5-18
5.4.5 2400-,4800-, 9600-bps Integrated Modem
Diagnostics 5 -18
5.4.5.1 Self-Test/Wrap Test 5-18
5.4.5.2 Integrated Modem Failure 5-18
5.4.5.3 ALT2 Self-Test 5-18
5.4.5.4 ALT2/IML Modem Wrap Test 5-22
5.4.5.5 Test Alarm Card (TAC) Extended Diagnostic 5-22
5.4.5.6 Procedure to Follow if IML Test 0111
is Flashing 5-22
5.4.6 Transmit Level Adjustment 5-22
5.4.6.1 U.S. and Canada 5-22
5.4.6.2 Other Countries 5-22
5.4.7 Front End Card Replacement and Adjustment 5-22
5.4.8 Test Alarm Card (T AC) Transmit Tone Adjustment 5-24
5.4.9 Board Wiring Options 5-25
5.4.9.1 Teleprocessing Attachment (Point-to-Point and
Multipoint) 5-25
5.4.9~2 Clear-to-Send Delay (Normally Not Adjusted) 5-25
5.4.9.3 Carrier Detect Sensitivity (Normally Not
Adjusted) 5-25
5.5.9.4 Continuous/Noncontinuous Carrier (Normally
Not Adjusted) 5-25
5.4.10 Card Wiring Options 5-25
5.4.10.1 Transmission Pre-Emphasis for 2400-bps (Normally
Not Adjusted) 5-25
5.4.11 2400-,4800-, and 9600-bps Integrated Modem
Reference Information 5-25
5.5 3274 System Grounding 5-25
5.6 Link Problem Determination Aid (LPDA)
5-29
5.7 Modem Address Switches 5-29
1
5.8 3290 Address Configuration 5-31
5.8.1 Configuration Support T 5-32
5.8.2 Configuration Support D 5-32
Contents ix