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IBM Manuals
Control Unit
3274 51C
Maintenance information
IBM 3274 51C Maintenance Information
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Chapter Introduction 1.1 General
Maintenance Approach
Field Replaceable Unit (FRU) Locations
0IA-Al Logic Board
Card Numbers
IML Options
Machine Model Number
Operator Panel
Indicators
Chapter 2. Subsystem Problem Isolation Procedure
Step 1 Using the Isolation Procedure
Step 2 Power Test
Step 3 Bus Test
Step 4 Internal Tests
Operational Indicators
Control Storage Card Layouts
Step 5 Device Adapters - Driver/Receiver
Step 6 Display Symbols (Category a Only)
Step 8 Host Attachment
Step 9 Voltage Checks
Step 10 Verification Test
Step 11 Last Option
Symptom Repair List
Chapter 3 . Maintenance Analysis Procedures (Maps)3-1
General
MAP A20, Control Logic Failure
Map A40 Diskette Failure
MAP A50, Type a Adapter Failure Code
Map A100 Machine Checkout
Turning
Chapter 4. Removal and Replacement Procedures
Machine Access - Cover Removal/Ce Manuals
Machine Access, Cover
Machine Access - Board/Tsr Supply
Card Removal and Replacement
Internal Cable/Connector, Removal and Replacement
Prime Power Box
Prime Power Box, Removal and Replacement
Prime Power Transformer
Fan Assembly, Removal and Replacement
Prime Power Transformer, Removal and Replacement
Fan Assembly
Diode Assembly, Removal and Replacement
Input Filter Capacitor, Removal and Replacement
TSR Power Supply, Removal and Replacement
TSR Power Supply
I/O Panel - Driver/Receiver, Removal and Replacement
I/O Panel, Driver/Receiver Card
Diskette Drive, Removal and Replacement
Line Plate Card, Removal and Replacement
Operator Panel/Indicator Card
Operator Panel/Indicator Card, Removal and Replacement
Operator Panel Switches, Removal and Replacement
Operator Panel Switches
3274 Model SIC BSC
3274 Models SIC and 52C Modes/Speeds
Chapter S. Communications Reference Data
Communications Facilities
Eia
Integrated Modem (1200 Bps)
Integrated Modem (1200 Bps) Wrap
Integrated Modems (2400, 4800, and 9600 Bps)
Loop
Switched
Communications Line Flow, EIA
Communications Line Flow, DDS Adapter
Communications Line Flow, Loop
CBS Data Coupler - U.S. and Canada
Wrap Test
Wrap Test Without Attached Modem
9600-Bps Integrated Modem
Line Attachments
Loop Indicators
Loop Wrap Test
Multipoint Network Operating Speed
Point-To-Point Network Operating Speed
Communications Line Flow, 2400-Bps, 4800-Bps, and 9600-Bps Nonswitched Integrated Modems (Model SIC) for U.S., Canada, and World Trade Countries
2400-,4800-, 9600-Bps Integrated Modem Diagnostics
ALT2 Self-Test
Integrated Modem Failure
Operate Indicator
Self-Test/Wrap Test
Signal Quality
Speed Control Backup
Test Results
ALT2/IML Modem Wrap Test
And Canada
Countries
Other Countries
Procedure to Follow if IML Test 0111 Is Flashing
Test Alarm Card (TAC) Extended Diagnostic
Transmit Level Switch Settings
2400-,4800-, and 9600-Bps Integrated Modem
Board Wiring Options
Card Wiring Options
Carrier Detect Sensitivity (Normally Not Adjusted)
Clear-To-Send Delay (Normally Not Adjusted)
Continuous/Noncontinuous Carrier (Normally Not Adjusted)
Multipoint)
Transmission Pre-Emphasis for 2400-Bps
3274 System Grounding
Board Wiring for the Various Teleprocessing Attachment Configurations
Top Card Connector Pin Locations
Pluggable ROS Removal Tool
3290 Address Configuration
Configuration Support D
Configuration Support T
Battery Power Supply Check
Chapter 6. 3274 Encrypt/Decrypt Feature
Featuredescription
Encrypt/Decrypt Failures
Feature Components
IML Display Indications
Procedure for Encrypt/Decrypt Battery Replacement
Entering the Terminal Master Key
Appendix E. 31SD Diskette Drive Maintenance E-L
Verifying the Terminal Master Key
Encrypt/Decrypt Feature Test
Appendix F. 5 Ltd Diskette Drive Maintenance F-1
Chapter 7. Response Time Monitor
Feature Description
IML Testing
Microcode Support
Appendix A. Locations
Card Connector
Card
Locations
Card Location Chart
Transformer Input and Fan Voltage Wiring
N-Sw and N-Sw-SNBU, U.S. and Canada
N-Sw, WT Except Canada
SW-AA/MA,'U.S. and Canada
N-Sw-SNBU-AA, WT Except Canada
Sw-AA, WT Except Canada
Operator Panel
Table of Contents
Chapter 1 Introduction
General Description
Diskette Description
Diskette Insertion and Removal
Maintenance
Electrical Characteristics
Machine Characteristics
Physical Characteristics
Environmental Characteristics
Machine Safety
Personal Safety
Safety
Diskette Drive Parts
Control Card Interface
Device Theory of Operation
Mechanicaloperation
Typical Device Operation
Read Data
Collet/Flat Spring Assembly
Collet/Flat Spring Removal
Maintenance
Collet/Flat Spring Replacement
Head/Carriage Assembly
Head/Carriage Pressure Pad Removal and
Replacement
Head/Carriage Adjustment
Head/Carriage Removal
Head/Carriage Replacement
Head Load Solenoid and Bail
Solenoid and Bail Service Check
Head Gap Service Check
Head Gap Adjustment
Bail Adjustment
Bail Removal
Bail Replacement
Solenoid and Idler Removal
Solenoid and Idler Replacement
AC Drive Parts
Drive Motor Removal
Drive Motor Replacement
Capacitor Removal
Capacitor Replacement
Drive Fan and Pulley Assembly Removal
Drive Fan and Pulley Assembly Replacement
Stepper Drive Parts
Stepper Motor Removal
Stepper Motor Replacement
Drive Band Removal
Drive Band Service Check
Drive Band Adjustment
Stepper Pulley and Clamp Removal
Stepper Pulley and Clamp Replacement
Drive Band Replacement
Diskette Speed Service Check
LED Output Service Check
LED Removal
LED Replacement
PTX Amplifier Service Check
Control Card Removal
Diskette Drive Control Card
PTX Removal
PTX Replacement
Control Card Replacement
Control Card Test Pins and Connector Pins
Diskette Drive
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Maintenance Library
Control Unit
Models 51C and 52C
Maintenance Information
°
SY27-2513-4
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