Compaq AlphaServer DS20 Service Manual download pdf (Page 3)

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Contents

Preface ........................................................................... ix

Chapter 1 System Overview

1.1 System Enclosure.....................................................................................1-2

1.2 Operator Control Panel and Drives ...........................................................1-4

1.3 System Consoles ......................................................................................1-6

1.4 System Architecture .................................................................................1-8

1.5 CPU Types.............................................................................................1-10

1.6 Memory .................................................................................................1-12

1.7 Memory Addressing and Data Location..................................................1-14

1.8 System Board.........................................................................................1-16

1.8.1 Cross-Bar Switch and System Components......................................1-18

1.8.2 I/O Subsystem.................................................................................1-20

1.8.3 System Board Switchpacks..............................................................1-22

1.9 Server Feature Module ...........................................................................1-24

1.9.1 Power Control Logic .......................................................................1-26

1.10 Power Circuit and Cover Interlock..........................................................1-28

1.11 Power Supply.........................................................................................1-30

1.12 Power Up/Down Sequence .....................................................................1-32

1.13 TIG Bus .................................................................................................1-34

1.14 Maintenance Bus (I

C Bus).....................................................................1-36

1.15 StorageWorks Drives..............................................................................1-38

Chapter 2 Troubleshooting

2.1 Troubleshooting During Power-Up...........................................................2-2

2.2 Control Panel Display and Troubleshooting ..............................................2-4

2.3 Power-Up Display and Troubleshooting....................................................2-6

2.4 Running Diagnostics — Test Command ...................................................2-8

2.5 Testing an Entire System..........................................................................2-9

2.6 Other Useful Console Commands...........................................................2-11

2.7 Troubleshooting with LEDs....................................................................2-12

2.8 Compaq Analyze....................................................................................2-14

2.8.1 Compaq Analyze Graphics Interface (GUI)......................................2-14

2.8.2 Description of the Error................................................................... 2-16

2.9 Releasing Secure Mode ..........................................................................2-20

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Compaq AlphaServer DS20 Service Manual Page 3