Table Of Contents - IBM System/360 2050 Maintenance 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
46
Test Methods (Mask and Expected Response)
46
MS Mode ROS Bit Tests .
47
ROS Mode FL T's
48
ROS Mode Hardcore Tests
48
ROS Mode Zero/One-Cycle Tests
51
Zero/One-Cycle Test Methods .
51
FLT Operating/Repair Procedures
53
Main Storage Ripple Test
56
Skipping Bad FLT Records
57
Disk (FLT) Operating Procedures
57
Cycle Test Repair Procedures (Tape/Disk)
58
Checkout After Repair
61
FLT Documentation
61
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
74
Multiplexor Channel Test Documentation
74
DIAGNOSTIC PROGRAMS
74
MIDAS Sense Switches
74
MIDAS Display Codes
74
MARGINAL CHECKlNG .
75
Nominal Voltages
76
Marginal Voltage Limits
76
Marginal Checking Procedure
76
Error Checking
76
ldentific a ti on
76
Failure Detection Facilities
76
PREVENTIVE MAINTENANCE
79
Lamp Test
79
Diagnostics .
79
SERVICE CHECKS, ADJUSTMENT AND REMOVAL
PROCEDURES
80
CPU AND CHANNEL SERVICE CHECKS
80
Waveform Measurements
80
2050 Clock .
80
MAIN STORAGE (MS) SERVICE CHECKS
80
Storage Test
80
Main Storage Test Points
80
Main Storage Addressing
81
Main Storage Temperature and Humidity
81
Main Storage Power Information
81
Exercise Bump Storage
82
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 •
83
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