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IBM Manuals
Computer Hardware
2025
Maintenance manual
IBM 2025 Maintenance Manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Preface
Table of Contents
Abbreviations
Safety
Chapter 1. Reference Data and Diagnostic Techniques
Section 1. Reference Data
Core Storage (Figures 1-1 through 1-17)
Trap Addresses
Address Stop/Match
Auxiliary Storage Maps (Figures 1-7 through 1-17)
2540 Reader/Punch (Figures 1-18 through 1-23)
1400 Compatitiility Feature (Figures 1-27 through 1-33)
Auxiliary Storage Module 0 (1400 Compatibility)
Auxiliary Storage Module 1 (1400 Compatibility)
Auxiliary Storage Module 2 (1400 Compatibility)
Auxiliary Storage Module 3 (1400 Compatibility)
Auxiliary Storage Module 4 (1400 Compatibility)
Auxiliary Storage Module 5 (1400 Compatibility)
Auxiliary Storage Module
Systems--1400 Compatibility)
Local Storage (1400 Compatibility)
Zone 0 (1400 Compatibility)
Zone 6 (1400 Compatibility)
Zone 7 (1400 Compatibility)
PR-KB (Printer-Keyboard) Figures 1-34 through
(Figure 1-4 7)
Cpu.mode
2311 Disk Mode
1403 Mode
2540 Reader Mode
(EXT to CPU)
(CPU to EXT)
(EXT to CPU)
(CPU to EXT)
Ext to Cpu
Local-Storage Location Decode
Program Codes and PSW (Figures 1-60 through 1-63)
Channel Command and Address Formats (Figures 1-64 through 1-68)
1403 Printer (Figures 1-73 through 1-95)
2311/DAC (Figures 1-96 through 1-118)
Section 2. Diagnostic Techniques
Maintenance Concepts
Malfunction Indications
Unit Identification
Malfunction Isolation
Repair
Repair Verification
Protection of Control Storage, CSL
Error Handling
Interface Control Check
1052Logout
CPU Hardware Checks
CPU Microprogram Checks
CPU Attachment Checks
2540 Attachment Checks
2311 Attaclunent Checks
Channel Checks
System Checks
Low Temperature
External Branch Conditions
Integrated 1403 Attachment
System Control Panel
CPU Status Indicators
Alter/Display PR-KB
Csl
Allow Manual
Clock off
System Checks
Low Temperature
Power Check
PCH (Punch)
RDR (Reader)
CHNL (Channel)
File
CPU Checks
Operator's Control Panel (OCP) Indicators
Power on Key
Pluggable Indicators
Control Storage Load
PSW Restart
Control Address Set
Enable Control Storage Store
Printer-Keyboard Alter/Display
Diagnostic Control Switch
Stop
Single Address as
Load Program Storage
Load Storage
Engineering Changes (Ec's)
Field Microprogram Changes
Field Change Exceptions
Unique Considerations
Multisystem Configuration
1401/1460 and 1440 Compatibility Features
Machine-Check Trap and 1052 Logout
Diagnose Instruction
CE Trap
CE Test Panel Hubs
Programming Errors
Local Storage Zone and External Mode
For 2560
Stop Position
Trap Position
Power and Cooling
Failure Detection, Indication, and Isolation
Cooling Facilities
Warm-Up
Convenience Outlets
Main Storage Diagnostic Aids
Andy Decode Numbering Scheme
Scoping Storage
Resistors
Resistors
Array Sense Line Checking
Chapter 2. Console and Maintenance Features
Section 1. Basic Unit
Storage Protect Key--Display
Patch Card Generation
Debe-2
1401 Emulator CSL Deck
1403 Buffer Load Microloop
Soft-Stop Loop--Single Cycling
Worst-Case Storage Scan Definition
MS Address Stop Procedure During IPL or CSL
Psw
PSW Restart
Procedure
Display of Current PSW
Description
Reader Checks During CSL
Checksum Routine--BCHK
Initializing Procedure--Checksum
System Configuration--CSL
BCPL Routine
Restrictions When Punching CSL Cards
Card
Metering Switch (CE Switch)
Display Operations
Program Storage Display
Auxiliary-Storage Display
Program-Storage Store
Auxiliary-Storage Store
SECTION La. PR-KB PROCEDURES
Addressing, Console Printer-Keyboard
Program-Controlled Operations
Channel Commands
Setup
Addressing
Execution of Alter or Display
End Operation
Message Formats
Alter Storage
Display Storage
Logout
Suggested Restart Procedures for Integrated PR-KB
Sense Bits 4, 5, 6, and
TI (1052 Data In)
TR (1052 Tilt/Rotate Register)
TD (1052 Diagnostic Branch Conditions)
TT (1052 Branch Conditions)
TU (1052 Diagnostic Branch Conditions)
CPU to External Facilities (1052)
TE (1052 Data Out)
SECTION Lb. 1403 PROCEDURES
Checks (1403)
PLB Parity Check
Hammer Check
Hammer Driver Coil--Fuses
Sync Check
Additional Checks
Forms Check
End of Forms
Suggested Restart Procedures for 1403
Command Reject (Sense Bit 0)
Intervention Required (Sense Bit 1)
Bus-Out Check (Sense Bit 2)
Data Check (Sense Bit 4)--MCS Only
Sense Bit
Resets (Integrated 1403)
2:36 External to CPU Facilities (1403)
PRI (Print Line Buffer Data-In)
PRS (1403 Sense/Status Conditions)
PRD (Diagnostic Conditions)
Diagnostic Decode
CPU to External Facilities (1403)
PRC (Carriage Control Register Data-Out)
MCS Table--Utility Program
SECTION Lc. 2311/DAC Procedures
Addressing--2311 Disk Storage Drive
Sense Conditions, DAC
Track Orientation
Error Recovery Procedures, 2311 DAC
Error Conditions Table, 2311 DAC
SECTION Ld. 2540 PROCEDURES
Addressing, Integrated 2540 Attachment
2540 Restarts from Error Conditions
Jam Removal
External to CPU Facilities
Rpl (Reader-Punch Data In)
RS (Reader Branch Conditions)
PS (Punch Branch Conditions)
RPS (Reader and Punch Branch Conditions)
Rpdl
RPD2 (Diagnostic Reader/Punch Branch Conditions)
RP= K (CS Decode= D)
D K (Cs Decode 9)
SECTION Le. CHANNEL PROCEDURES
Multiplexer Channel Device Addressing
Channel and Unit Addressing Restrictions
Channel
The MPX Channel and ICA Features)
Assigning Integrated 1052, 1403, 2311, and 2540 Device Addresses
Channel Status (Byte 0)
Op-Flag (Byte 1)
Data Address (Bytes 2 and 3)
Count (Bytes 4 and 5)
Next CCW Address (Byte 6 and 7)
Channel Status (LS Zone 7 Register GO)
Data Addrt!Ss (LS Zone 7 Register V)
Count (LS Zone 7 Register U)
Next CCW Address (Auxiliary Storage Location 008A)
Channel Error-Handling Philosophy and Logout
Channel Status Byte
Logout
Channel Control Check Logout
Interface Control Check Logout
Standard Interface Hardware
GS (Channel Branch Conditions)
GT (Channel Branch Conditions)
GD (Channel Diagnostic Register)
IN (Channel Bus-In)
CPU to External Facilities (Channel)
OUT (Channel Bus-Out)
SECTION Lf. ICA PROCEDURES
Nonoperational Lines
Station Selection Feature
Jumper Options
Section 2. Features
Multiple Character Set
2560 Procedures
Chapter 3. Preventive Maintenance
Section 1. Basic Unit
Section 2. Features
Chapter 4. Checks, Adjustments, and Removals
Section 1. Basic Unit
CPU Timing
Specifications
Core Storage Array Temperature Control
Cooling
Specification
Heating
Heater Adjustment
Schmoo Curve (Main Storage)
Example of Schmoo Curve Procedure
When to Schmoo
Service Checks
Worst-Case Patterns
Worst-Case Test
Four-Point Strobe Schmoo Procedure
Checkout Procedures
Scoping Main Storage
Two-Point Schmoo Procedure
Main Storage Replacement
Removing the 0-32K Unit
Removing the 32-64K Unit
Array Changing
Changing Diodes
Local Storage
Scoping Local Storage
Initial Delay Line Settings
Delay Lines (Local Storage) Adjustment
Local Storage/Storage Protect Cards
SCR Circuits
Replacement
System Reset, IPL, or CSL--Singleshot
Adjustment
Operational Out--Singleshot
Checkout Procedure
2540 Attachment
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Restricted Distribution
Field Engineering
Maintenance Manual
This manual is intended for internal use only and may not be
used by other than IBM personnel without IBM's written permission.
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