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4-2
6
Al
phaSe
rver D
S20
Se
rvi
ce
Ma
nual
4.13
Sys
tem Fan
Rem
o
val
and
Repl
ac
em
ent
Fig
ure 4-12
Remo
vi
ng Syste
m Fan
FA
N
0
FA
N
1
Modul
e Guides
PK
1400-9
8
1
2
...
111
112
113
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...
181
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AlphaServer DS20
1
Contents
3
Chapter 3 Error Registers
4
Appendix C Firmware Update
5
Examples
5
Intended Audience
9
Document Structure
9
Documentation Titles
10
Information on the Internet
10
System Overview
11
Chapter 1
11
System Enclosure
12
PKW-0501-97
14
System Consoles
16
System Architecture
18
CPU Types
20
Figure 1-6 Memory Placement
22
PK1488-98
24
Example 1–1 Show Memory
25
Interrupts
28
Table 1-1 PCI Slot Numbering
31
PK1410-99
32
Table 1-2 Switchpack 2
33
Table 1-3 Switchpack 3
33
Server Feature Module
34
1.9.1 Power Control Logic
36
PK1493-98
38
Power Supply
40
Power Up/Down Sequence
42
Maintenance Bus (I
46
Error State
47
StorageWorks Drives
48
System Overview 1-39
49
Chapter 2
51
Troubleshooting
51
Testing an Entire System
59
Other Useful Console Commands
61
Troubleshooting with LEDs
62
Compaq Analyze
64
Continued on next page
67
Table 2-2 Types of Errors
69
Releasing Secure Mode
70
Chapter 3
71
Error Registers
71
Ibox Status Register - I_STAT
72
MM_STAT
73
PK1416-99
75
Cbox Read Register
77
Miscellaneous Register (MISC)
79
PK1418-99
82
Pchip Error Register (PERROR)
83
Failure Register
86
Table 3-8 Failure Register
87
Function Register
88
Table 3-9 Function Register
89
Chapter 4
91
Removal and Replacement
91
FRU List
92
System Access
96
CPU Removal and Replacement
98
Figure 4-4 Removing Memory
100
System Board
102
Slot Cover
104
Option Card
104
Replacement
106
PK1404-99
110
PK1481 - 9
114
Module Guides
116
PKW0519A-97
118
➊ in Figure
119
Replacement
120
Figure 4-15 Removing CD-ROM
122
PK1401-98
124
PKW0501B-97
126
PK1412-99
130
Appendix A
133
Halts, Console Commands, and
133
Environment Variables
133
Halt Button Functions
134
Using the Halt Button
135
Halt Assertion
136
Appendix B
145
Managing the System Remotely
145
RCM Overview
146
First-Time Setup
147
➊ in Example
148
RCM Commands
149
Using the RCM Switchpack
154
Troubleshooting Guide
157
Appendix C
159
Firmware Update
159
PK1461-98
160
Diskettes
166
Update
168
(Continued)
170
Internal Floppy Disk
171
C.1.5 LFU Commands
176
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