Table Of Contents - Compaq AlphaServer DS20 Service Manual

Preface ...........................................................................
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
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
2
C Bus)..................................................................... 1-36
Contents
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