Apple mac pro 8x User Manual

Mac Pro (8x) Take Apart — Power Cable Harness 131
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.  

© 2007 Apple Inc. All rights reserved.
 Service Source 
Troubleshooting
Mac Pro (8x) 

Mac Pro (8x) Troubleshooting — General Information 13 3
General Information
Memory
The Mac Pro (8x) computer has two memory 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 
1 GB of memory, installed as a pair of 512 MB fully buffered, dual inline memory modules (FB-
DIMMs) in two of the DIMM slots. Additional DIMMs can be installed in the open DIMM slots, as 
illustrated below.
Note: DIMMs must be installed...

Mac Pro (8x) Troubleshooting — General Information 134
DIMMs for Mac Pro (8x) must fit these specifications:
667 MHz, FB-DIMMs• 
72-bit wide, 240-pin modules• 
36 devices maximum per DIMM• 
Error-correcting code (ECC)• 
Important: For proper operation of Mac Pro (8x) computers, Apple recommends using only 
Apple-approved Mac Pro (8x) FB-DIMMs. Refer to GSX for Apple FB-DIMMs service part numbers.
PCI Express Cards
The Mac Pro (8x) logic board includes one double-wide PCI Express graphics slot and three...

Mac Pro (8x) Troubleshooting — General Information 13 5
M43a Int Cable Matrix Rotated.xls
CONDIFENTIAL - NEED T O KNOW ONLY
Cable, Connector and Signal MatrixCABLE DESCRIPTION
Service PN
LENGTH (mm)
LENGTH (in)
MLB CONN LOCATION
MLB CONN LABEL
MLB CONN DESCRIPTION
CONNECTOR 2 DESCRIPTION
CONNECTOR 3 DESCRIPTION
CONNECTOR 4 DESCRIPTION
CONNECTOR 5 DESCRIPTION
POWER / SIGNALS CARRIED
HDD SATA
P art of 922-7682
450
17.7
C -1
SATA
36-pin high-densit y
7-pin flat to HDD 1
7-pin flat to HDD 2
7-pin flat to HDD...

Mac Pro (8x) Troubleshooting — General Information 13 6
Cable Connector Locations
Use the diagram below to find the location of the internal cable connectors on the logic board.
A        B       C        D        E        F        G       H        J   \
      K
A 
       B       C        D        E        F        G       H        J   \
      K
1 2 3 4 5 6 7 8 9
12 3 4 5 6 7 8 9
Thermal Calibration
Unlike in earlier Power Mac G5 computers, replacing a processor in a Mac Pro (8x) computer does 
not...

Mac Pro (8x) Troubleshooting — General Information 13 7
Resetting the Logic Board
System Management Controller (SMC) Reset
The System Management Controller (SMC) is a chip on the logic board that controls all power 
functions for the computer. If the computer is experiencing any power issue, resetting the SMC 
may resolve it. The SMC controls several functions, including:
Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth• 
Handling system resets from various commands•...

Mac Pro (8x) Troubleshooting — General Information 13 8
Real Time Clock (RTC) Reset
The Real Time Clock (RTC) is a chip on the logic board that controls the date and time functions 
of the computer. If the computer is experiencing an issue booting, resetting the RTC may resolve 
it. Follow these steps to reset the RTC:
From the Apple menu, choose Shut Down (or if the computer is not responding, hold the 1. 
power button until it turns off ).
Unplug the AC power cord.2.  
Remove the battery for at least...

Mac Pro (8x) Troubleshooting — General Information 13 9
Diagnostic LEDs
The Mac Pro (8x) logic board includes a set of LEDs to help service providers troubleshoot the 
computer. The LEDs are located toward the rear of the logic board, under the memory cage, next 
to PCI card slot 1. You can view these LEDs by removing the computer’s side access panel and 
looking through the memory cage to the logic board below. LEDs 2, 3, 4, and 5 are normally off 
and will automatically illuminate if an error occurs....

Mac Pro (8x) Troubleshooting — General Information 140
Use the following table to interpret the LEDs.
LocationNameColorNominalPress DIAG_
LED button 
to display
Indicates
Led 1Trickle PwrYellowOnYe sPower supply 
is providing 
trickle power
Led 2CPU B ErrorRedOffNoCPU B halts 
on an IERR 
(instruction 
error)
Led 3CPU A ErrorRedOffNoCPU A halts 
on an IERR 
(instruction 
error)
Led 4CPU B OTRedOffNoCPU B is over 
temperature
Led 5CPU A OTRedOffNoCPU A is over 
temperature
Led 6GPU PresentGreenOnYe sEFI...