Apple power mac g5 june 2004 User Manual

							
36 Power Mac G5 Take Apart

Procedure
Disconnect the optical drive ribbon cable from the logic board. ( The cable connector is 
located under the media shelf that holds the optical drive.) 
Push the optical drive levers out to release the drive.
1.
2. 
						

							
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Place the fingers on one hand inside the opening for the optical drive cable and push the 
edge of the drive forward. The drive will move part way out of the media shelf.
Disconnect the power cable from the drive.
Route the drive ribbon cable out through the opening in the media shelf and remove the 
drive and ribbon cable from the computer.
3.
4.
5. 
						

							
38 Power Mac G5 Take Apart

If you are replacing the drive with a new drive, install the standoffs on the bottom of the 
new drive. 
Note for SuperDrives: Two bags of standoffs are included with each drive. Use the standoffs 
with a Phillips head on Sony drives; use the standoffs with a hex head on Toshiba and 
Pioneer drives. 
Note for Combo Drives: Use only the standoffs that are included with the new drive. Do not 
transfer the standoffs from the original drive to the replacement drive. 
6. 
						

							
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Disconnect the ribbon cable from the back of the drive, and then carefully pry the cable 
from the top of the drive. Transfer the cable to the top of the replacement drive, and connect 
the cable to the drive. 
Note: Reusable adhesive tape on the underside of the cable attaches the cable to the drive. 
When removing the cable from the original drive, be careful to keep the tape with the cable. 
Carefully remove the EMI shield from the front of the original drive and transfer it to the 
front of the replacement drive.
Replacement Note: Insert the optical drive part way into the optical drive bay, and connect the 
power cable to the drive. Then bend down the free end of the ribbon cable, route it through the 
opening at the back of the media shelf, and connect the cable to the logic board.
7.
8. 
						

							
40 Power Mac G5 Take Apart

Front Inlet Fan(s)
The front inlet fan assembly consists of one or two fans in a plastic bracket. If the computer is a 
uniprocessor, the assembly contains a single fan; if the computer is a dual processor, the assembly 
contains two fans connected by a single cable.
You must remove the front inlet fan assembly to access many other parts within the computer. 
For this access, remove the bracket with the fans attached. You will have to remove the fans from 
the bracket only if you are replacing the fans themselves.
Tools
The only tool required for this procedure is needlenose pliers.
Preliminary Steps
Before you begin, open the computer and lay it on its side with the access side facing up.
Part Location 
						

							
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Procedure
Hold the front inlet fan assembly by the front handle and firmly pull it out of the computer.1. 
						

							
42 Power Mac G5 Take Apart

If you are replacing the fan(s) in the bracket, do the following: 
•  Remove the fan cable from the cable guide.
 
•  Using needlenose pliers, pull the fan(s) off the grommet fasteners, and remove the fan(s) 
 
  and cable from the bracket.
 
Important: If you are replacing two fans, be careful that you do not separate the fans from 
each other. They are connected by a common cable.
2. 
						

							
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Replacement Note: To replace the front inlet fan bracket in the enclosure, align the large rail on 
the bracket with the cutout in the PCI divider and press firmly. 
Important: Make sure the connector on the fan fully engages the fan connector on the logic 
board, or the computer will not operate properly. Gently pull the fan assembly to test whether it 
is connected. 
						

							
44 Power Mac G5 Take Apart

Memory (DIMMs)
Depending on the model, Power Mac G5 computers have either four or eight Dual Inline 
Memory Module (DIMM) slots arranged in two banks. The slots accept Double-Data-Rate (DDR) 
Synchronous Dynamic Random-Access Memory (SDRAM) devices. 
The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs 
installed in slot 1 of each DIMM bank. You can add DIMMs, provided they are installed in pairs of 
equal size, one per bank, from the center outward. A diagram marked on the logic board near the 
DIMM slots illustrates how the pairs must be installed. 
To determine the types of DIMMs to install, refer to the table below:
DIMM Slots DIMM speed Maximum amount
4333 MHz, PC 2700 up to 4 GB
8400 MHz, PC 3200 up to 8 GB 
						

							
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In addition, DIMMs must fit these specifications: 
2.5 volt
184-pin module
Maximum number of memory devices on DDR SDRAM:16.
Nonparity
No error correcting codes (ECC)
Unbuffered (registered or buffered DDR SDRAM cannot be used)
Important: Always install DIMMs in pairs of equal size. Memory from older computers is not 
compatible with the Power Mac G5. Do not use older memory, even if it fits into the DIMM slots.
Note: The Power Mac G5 (June 2004/Early 2005) models support only 184-pin, 2.5 volt, 
DDR400-compliant (PC3200) DRAM DIMMs with a maximum of 4 GB or 8 GB depending on the 
configuration. 
Tools
No tools are required for this procedure.
Preliminary Steps
Before you begin, open the computer, lay it on its side with the access side facing up, and 
remove the front inlet fan assembly.
Part Location
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•
•
•
•
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