Apple xserve cluster node User Manual

Xserve Take Apart - 69
 Battery
Procedure
1. Pry up the battery from its holder.
Note: You may first need to spread the two tabs on the holder slightly apart to 
release the battery.
2. Remove the battery from the server.
Note: When replacing the battery, make sure the positive (+) end of the battery aligns with 
the + symbol on the battery holder. 

70 - Xserve Take Apart
 Logic Board
Logic Board
Tools
No tools are required for this procedure. You may, however, Þnd a Phillips screwdriver 
useful in releasing the thumb screw in step 1 below.
Preliminary Steps
Before you begin, open the server and remove the following.
¥ DIMMs
¥ PCI cards
¥ processor
¥ ATA controller board
¥ power supply
Note: The replacement logic board does not include the processor, memory DIMMs, or 
expansion cards. You must transfer these modules from the original board to the...

Xserve Take Apart - 71
 Logic Board
Procedure
1. Release the thumb screw that secures the logic board to the chassis.
2. Move the logic board forward and up slightly to release it from the four mounting pegs.
3. Tilt up the end of the logic board nearest the blowers so that the board ports clear the 
chassis.
4. Remove the board from the server.
Replacement Note: Before installing the replacement logic board, check the heatsink 
thermal pad on the underside of the board. If the pad is covered with a...

72 - Xserve Take Apart
 Logic Board Important: When replacing the logic board, make sure the boardÕs connectors Þt through 
the appropriate openings in the serverÕs back panel. Take special care to Þt the clear 
plastic system identiÞer button through its opening. (The system identiÞer button is located 
low on the back panel, to the left of center.) 
After installing a replacement logic board, be sure to transfer any PCI cards, risers, and 
DIMMs to the new board. You must also remove the battery...

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ð Service Source
Troubleshooting
Xserve 

Xserve Troubleshooting - 1
 General Information
General Information
WhatÕs New
Rack-Mounted Server
Xserve is designed to be mounted in a rack. Once the server is installed in the rack, you 
can slide it open from the front to exchange or add parts.
For more information, see ÒOpening the ServerÓ in the Take Apart chapter.
Server IdentiÞer Light/Button
The identiÞer light on the serverÕs front panel turns on when internal sensors or a systems 
administrator detects a problem with the server. (The light can...

2 - Xserve Troubleshooting
 General Information
Diagnostics
Four types of diagnostics are available for Xserve:
¥ status lights
¥ remote monitoring
¥ Apple Hardware Test
¥ Apple Service Diagnostic
For more information, see ÒDiagnostic ToolsÓ below.
DDR Memory
The serverÕs logic board includes four memory slots, which accept double data rate (DDR) 
SDRAM DIMMs. Memory can be expanded to a maximum of 2 gigabytes. 
DIMMs used in the original Xserve must Þt these speciÞcations:
¥ PC2100 DDR SDRAM, also known...

Xserve Troubleshooting - 3
 General Informationport that supports RS-232 connection. There is also one FireWire 400 port on the front of 
the server.
System administrators or service providers can connect a laptop computer or terminal to 
the serial port and then use command-line tools to change settings on the server. The 
connection requires a serial cable with these speciÞcations:
¥ DB9 connector
¥ 8-bit
¥ no parity
¥ 1 stop bit
¥ 9600 kbps
Note: For a diagram of the ports location, see ÒExternal...

4 - Xserve Troubleshooting
 General Information
Block Diagram
Ethernet Port
Firewire Port 1
Firewire Port 2
PCI Slots Network Card Slot
L3 CachePowerPC G4
Microprocessor
U2
memory
controller
and PCI
bus bridge
Ethernet
PHY
Firewire
PHY
USB Port 1
USB Port 2
DIMM Slots
Main Logic Board Processor Module

Boot
ROM
ATA
InterfaceATA
Interface
Firewire
PHYFirewire Port 3
PCI
Bridge
PCI
Bridge
U2
Memory
Controller
and PCI
Bus Bridge
Apple Drive Module
Connectors
Internal Optical
Drive ConnectorEIDE
Bus
Serial...

Xserve Troubleshooting - 5
 General Information
Resetting the PMU on the Logic Board
The PMU (Power Management Unit) is a microcontroller chip that controls all power 
functions for the server. The PMU is a computer within a computer. Its function is to: 
¥ tell the server to turn on, turn off, sleep, wake, idle, etc.
¥ manage system resets from various commands.
¥ maintain parameter RAM (PRAM).
¥ manage the real-time clock.
Important: Be very careful when handling the logic board. The PMU is very...