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Computer Hardware
System/360 2050
Maintenance manual
IBM System/360 2050 Maintenance Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Diagnostic Techniques
Maintenance Philosophy
Failure Detection
Deferred Maintenance
Troubleshooting F1Owcharts
Power Faults
Loading Faults
Programming Faults and Error Stops
Other Maintenance Documentation
Error Check Analysis Diagrams
Service Aids
ALD Page Key
CAS Logic Diagram Page Key
Optional Feature Version Codes
Di3Gnostic Mode Codes
Selector Channel Error Handling
Interface Control Check
Channel Control Check--Channel Detected
Channel Control Checl<--CPU Detected
Program, Storage-Protect, and Chaining Check
Data Check
SIM Check
Incorrect Length Indication
Error Priority
Maintenance Features
CPU Control Modes
Sequence Counter Mode
Main Store Mode
ROS Mode
Functional Units
Sequence Counter
Sequence St:rts
FLT Op Reg
Scan/Log Decoder
ROS Kernels
Log Trigger
Supervisory Stat
Progressive Scan Stat
Supervisory Enable Storage Stat
Binary Trigger
Scan Test Counter
Pass/Fail Triggers
Supervisory Controls
Clock Gating Control Circuits
CPU Control Status Circuits
Changing CPU Control Status
Supervisory Interrupts
Linkage Control Word
Diagnose Instruction
FAULT LOCATING TESTS (Flt's)
Fl. T Load
Load from Tape
Load from Disk
Unsuccessful Load
Completion of Successful Load
Main Store Mode Fl. T's
MS Mode Hardcore Tests
FLT Load Checking Program
Test Methods (Mask and Expected Response)
MS Mode ROS Bit Tests
ROS Mode FL T's
ROS Mode Hardcore Tests
ROS Mode Zero/One-Cycle Tests
Zero/One-Cycle Test Methods
FLT Operating/Repair Procedures
Main Storage Ripple Test
Skipping Bad FLT Records
Disk (FLT) Operating Procedures
Cycle Test Repair Procedures (Tape/Disk)
Checkout after Repair
FLT Documentation
Progressive Scan
Test Descriptions
Test Patterns
Selector Channel Tape or Disk
Selector Channel Clock Control
Selector Channel Operating Procedure Example
Selector Channel Test Documentation
Selector Scan Monitor
Multiplexor Channel Tape or Disk
Multipl
Multiplexor Channel Test Documentation
Diagnostic Programs
MIDAS Sense Switches
MIDAS Display Codes
MARGINAL Checklng
Nominal Voltages
Marginal Voltage Limits
Marginal Checking Procedure
Error Checking
Ldentific a Ti on
Failure Detection Facilities
Preventive Maintenance
Lamp Test
Diagnostics
Cpu and Channel Service Checks
Waveform Measurements
2050 Clock
Main Storage (Ms) Service Checks
Storage Test
Main Storage Test Points
Main Storage Addressing
Main Storage Temperature and Humidity
Main Storage Power Information
Exercise Bump Storage
Continually Address One MS Location
Scan MS for Bad Parity
Bit Arrangement of MS Word
Check Strobe of Main Storage
Checking MS Drivers and Terminating Diodes
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