Apple mac pro early 2008 User Manual

Mac Pro (Early 2008) Take Apart — Power Cable Harness 141
Power Cable Harness
The power cable harness consists of the following cables:
Power supply PS1 cable• 
Power supply PS2 cable• 
Power supply PS3 cable• 
Power supply PS4 control cable• 
Front panel board power cable• 
Front panel board audio cable• 
Front panel board FireWire 800 cable• 
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...

Mac Pro (Early 2008) Take Apart — Power Cable Harness 142
Part Location
Procedure
Disconnect the power cable harness connectors from the logic board. 1.  

Mac Pro (Early 2008) Take Apart — Power Cable Harness 143
Using a Phillips screwdriver, remove the two mounting screws on the power supply cable 2. 
cover located at the back of the optical drive bay. 
Slide the cover toward the top of the enclosure, tilt it up until the two tabs on the cover clear 3. 
the slots in the media shelf, and remove the cover from the enclosure. 
 
Replacement Note: Replace the cover at an angle so that the tabs engage with the slots in 
the media shelf. Then lower the cover...

Mac Pro (Early 2008) Take Apart — Power Cable Harness 14 4
Release the four power supply cables from their hook-and-loop fasteners on the enclosure.4. 
Depress the locking latch on each cable connector and disconnect the four power supply 5. 
cables from the four connectors on the power harness cable. 
Slip the four connectors out through the opening in the media shelf, removing them one at 6. 
a time.  

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Untape the power harness cable from the enclosure. 7. 
Remove the power harness cable from its routing along the edge of the logic board, over the 8.  
speaker assembly, and along the bottom lip of the enclosure. 
Remove the power harness cable from the enclosure.9.  

© 2008 Apple Inc. All rights reserved.
 Service Source 
Troubleshooting
Mac Pro (Early 2008) 

Mac Pro (Early 2008) Troubleshooting — General Information 14 7
General Information
Memory
The Mac Pro (Early 2008) computer has two memory riser cards with a total of 8 memory slots. 
On each card, the slots are arranged as two banks of two slots each. The computer comes with 
a minimum of 2 GB of memory, installed as a pair of 1 GB FB-DIMMs. Additional pairs of 1 GB, 2 
GB, or 4 GB FB-DIMMs can be installed in the open DIMM slots, as illustrated below. Maximum 
memory is 32 GB.
DIMMs must be installed...

Mac Pro (Early 2008) Troubleshooting — General Information 14 8
DIMMs for Mac Pro (Early 2008) must fit these specifications:
800 MHz, DDR2, FB-DIMMs• 
72-bit wide, 240-pin modules• 
36 memory ICs maximum per DIMM• 
Error-correcting code (ECC)• 
Memory from older Macintosh computers is not compatible with Mac Pro (Early 2008). 
Important: For proper operation of Mac Pro (Early 2008) computers, Apple recommends using 
only Apple-approved Mac Pro (Early 2008) FB-DIMMs. Refer to GSX for Apple FB-DIMMs...

Mac Pro (Early 2008) Troubleshooting — General Information 149
DIMMs must be installed as pairs of identical size and type, from the same vendor. One pair • 
need not match another pair. (Refer to the illustration on page 147.)
On either riser card, if a DIMM is installed in position 3 or 4 without DIMMs in positions 1 • 
and 2 on that riser card,  the DIMM in position 3 or 4 will not be recognized by the system. 
DIMMs in positions 3 and 4 rely on DIMMs in positions 1 and 2 to forward information to and...

Mac Pro (Early 2008) Troubleshooting — General Information 150
Cable Matrix
M86 Int Cable Matrix Vertical.xlsCONDIFENTIAL - NEED T O KNOW ONLY
CABLE DESCRIPTION
Service 
PN
MLB CONN 
LOCATIONPOWER / SIGNALS CARRIED
HDD SATA
P art of 922-
8487C -1
Serial A TA signals to/from all 
four HDDs and main logic board
HDD P ower
Part of 922-
8487A -1
DC power to all four HDDs from 
main logic board
HDD Thermal Sensor922-8522A-2
Thermal sensor signals from 
sensors in all HDD ba ys to main 
logic board
Optical...