Compaq AlphaServer DS20 Service Manual page 6

Figures
1-1 System Enclosure .........................................................................................1-2
1-2 Cover Interlock Circuit.................................................................................1-3
1-3 Control Panel Assembly ...............................................................................1-4
1-4 Block Diagram .............................................................................................1-8
1-5 CPU Module Placement ............................................................................. 1-10
1-6 Memory Placement .................................................................................... 1-12
1-7 Contents of DIMMs ................................................................................... 1-14
1-8 Memory Configuration............................................................................... 1-15
1-9 System Board............................................................................................. 1-16
1-10 Cross-Bar Switch Data Block Diagram ....................................................... 1-18
1-11 PCI Block Diagram .................................................................................... 1-20
1-12 Switchpack Location .................................................................................. 1-22
1-13 Server Feature Module ............................................................................... 1-24
1-14 Power Control Logic .................................................................................. 1-26
1-15 Power Circuit Diagram............................................................................... 1-28
1-16 Back of Power Supply and Location ........................................................... 1-30
1-17 Power Up/Down Sequence Flowchart......................................................... 1-32
1-18 TIG Bus Block Diagram............................................................................. 1-34
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1-19 I C Bus Block Diagram .............................................................................. 1-36
1-20 StorageWorks Drive Location .................................................................... 1-38
2-1 Control Panel and LCD Display....................................................................2-4
2-2 CPU and Server Feature Module LEDs....................................................... 2-12
2-3 Compaq Analyze Graphics Interface........................................................... 2-14
4-1 Some of the FRU Locations..........................................................................4-2
4-2 Accessing the System ...................................................................................4-6
4-3 Removing CPU Module ...............................................................................4-8
4-4 Removing Memory .................................................................................... 4-10
4-5 Removing System Board ............................................................................ 4-12
4-6 Removing PCI/ISA Option......................................................................... 4-14
4-7 Removing Server Feature Module .............................................................. 4-16
4-8 Removing Power Supply ............................................................................ 4-18
4-9 Removing Power Harness........................................................................... 4-20
4-10 Removing Power Transition Module .......................................................... 4-22
4-11 Remove Auxiliary Fan Removal................................................................. 4-24
4-12 Removing System Fan................................................................................ 4-26
4-13 Removing Cover Interlock.......................................................................... 4-28
4-14 Removing OCP .......................................................................................... 4-30
4-15 Removing CD-ROM .................................................................................. 4-32
4-16 Removing Floppy....................................................................................... 4-34
4-17 Removing StorageWorks Disk.................................................................... 4-36
4-18 Removing StorageWorks Backplane........................................................... 4-38
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