IBM System/360 2050 User Manual

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 (111)
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
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CO.NT ENI.a
FLT Load Checking Program
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Test Methods (Mask and Expected Response)
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MS Mode ROS Bit Tests .
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ROS Mode FL T's
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ROS Mode Hardcore Tests
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ROS Mode Zero/One-Cycle Tests
51
Zero/One-Cycle Test Methods .
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FLT Operating/Repair Procedures
53
Main Storage Ripple Test
56
Skipping Bad FLT Records
57
Disk (FLT) Operating Procedures
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Cycle Test Repair Procedures (Tape/Disk)
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Checkout After Repair
61
FLT Documentation
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PROGRESSIVE SCAN .
63
Test Descriptions
63
Test Patterns 71
Selector Channel Tape or Disk
71
Selector Channel Clock Control
71
Selector Channel Operating Procedure Example
72
Selector Channel Test Documentation
72
Selector Scan Monitor
74
Multiplexor Channel Tape or Disk
74
Multipl~ .. or Ch;mr.d Operating Procedure
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Multiplexor Channel Test Documentation
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DIAGNOSTIC PROGRAMS
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MIDAS Sense Switches
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MIDAS Display Codes
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MARGINAL CHECKlNG .
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Nominal Voltages
76
Marginal Voltage Limits
76
Marginal Checking Procedure
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Error Checking
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ldentific a ti on
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Failure Detection Facilities
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PREVENTIVE MAINTENANCE
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Lamp Test
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Diagnostics .
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SERVICE CHECKS, ADJUSTMENT AND REMOVAL
PROCEDURES
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CPU AND CHANNEL SERVICE CHECKS
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Waveform Measurements
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2050 Clock .
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MAIN STORAGE (MS) SERVICE CHECKS
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Storage Test
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Main Storage Test Points
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Main Storage Addressing
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Main Storage Temperature and Humidity
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Main Storage Power Information
81
Exercise Bump Storage
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Continually Address One MS Location
82
Scan MS for Bad Parity
82
Bit Arrangement of MS Word
82
Check Strobe of Main Storage
82
Checking MS Drivers and Terminating Diodes •
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IBM System/360 2050 Specifications

General

Brand	IBM
Model	System/360 2050
Category	Computer Hardware
Language	English