Apple xserve g5 or xserve g5 january 2005 User Manual

Xserve G5 Take Apart - 69
 Logic Board
Part Location
Note:  The version 2 logic board is shown above. 

70 - Xserve G5 Take Apart
 Logic Board
Procedure
1. Disconnect the FireWire cable from the logic board
2. Release the two locking levers on the front panel board cable connector and 
disconnect the cable from the logic board.
3. Disconnect the three-headed drive cable from the logic board.
4. Release the locking tab and disconnect the power cable from the logic board.
5. Fold the cables out of the way toward the front of the server. 

Xserve G5 Take Apart - 71
 Logic Board 6. Using a Phillips screwdriver, release the thumbscrew that secures the logic board to 
the chassis (indicated by a triangle in the illustration below).
Note:  The thumbscrew is captive; you cannot remove it.
7. Grasping the logic board by its long edges, move it forward and up slightly to release it  from the four mounting pegs (indicated by squares in the illustration below).
Caution : Be careful not to  flex the logic board, which could damage the board or its...

72 - Xserve G5 Take Apart
 Logic Board
Important:
 When replacing the logic board, make sure the board’s connectors  fit through 
the appropriate openings in the server’s back panel. Take special care to  fit the clear 
plastic system identi fier button through its opening. (The system identi fier button is located 
low on the back panel, to the left of center.) 
Caution : Be careful not to  flex the logic board, which could damage the board or its 
components. To minimize  flexing, always grasp the logic...

 

© 2005 Apple Computer, Inc. All rights reserved.
 
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Service Source
Troubleshooting
 
Xserve G5 

 

Xserve G5 Troubleshooting - 
 
1
 
 General Information
 
General Information
 
What’s New
 
Hot-Pluggable Serial ATA Drives
 
Xserve G5 and Xserve G5 (January 2005) include three hard drive bays at the front of the 
server; Xserve G5 (Cluster Node) includes just one hard drive. All versions support hot-
pluggable Apple serial ATA (SATA) drive modules. 
In the Xserve G5/Xserve G5 (January 2005) server, drive bays are numbered 1–3, 
beginning with the far left bay. The bay in which a drive is...

 

2 - 
 
Xserve G5 Troubleshooting General Information
 
Ports
 
The standard configuration of Xserve G5 includes the following ports on the back panel: 
two gigabit Ethernet ports, two FireWire 800 ports, two USB 2.0 ports, and a serial port 
that supports RS-232 or RS-422 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...

 

Xserve G5 Troubleshooting - 
 
3
 
 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....

 

4 - 
 
Xserve G5 Troubleshooting General Information
 
Power Supply Verification
 
If the server fails to power on,  first reset the PMU. Then follow the procedure outlined 
below to determine whether the problem is related to the power supply.
 
Note:
 
 To verify the power supply, you need a volt meter. When connecting the volt meter 
leads to speci fic pins, make sure the power supply remains securely plugged into its 
connector on the logic board.
The following  figure shows the pins and voltage on...

 

Xserve G5 Troubleshooting - 
 
5
 
 General Information
 
Entering Firmware Boot Commands From the Front Panel
 
You can use the system identifier button on the Xserve G5  server’s front panel to initiate a 
limited number of  firmware commands to the system without connecting a keyboard or 
monitor to the server. The commands are listed below; you enter each command with a 
combination of the system ID button and a speci fic light on the front panel.
 
Note:
 
 If Open Firmware Security is turned on...