Mac Repair Central

Block Diagram

The architecture of the Power Mac G5 computer is based on the PowerPC G5 microprocessor and two custom ICs: the U3 memory controller/bus bridge and the K2 I/O controller.

Processor module

Processor module

64-bit PowerPC G5 microprocessor

64-bit PowerPC G5 microprocessor

32-bit out

32-bit in

32-bit out

Main logic board

800/900/1000 MHz buses

8X AGP-Pro slot

Main logic board

800/900/1000 MHz buses

8X AGP-Pro slot

10/100/1000 Ethernet port

FireWire 400 port (front) FireWire 400 port (rear) FireWire 800 port (rear)

USB 2.0 port (rear) 480 Mbps

USB 2.0 port (rear) 480 Mbps

USB 2.0 port (front) 480 Mbps

AirPort antenna port

Bluetooth antenna port

Analog line-in Analog line-out Headphone jack Optical audio in S/PDIF Optical audio out S/PDIF

10/100/1000 Ethernet port

FireWire 400 port (front) FireWire 400 port (rear) FireWire 800 port (rear)

To ensure proper fan and temperature control in the Power Mac G5, you must run Apple Service Diagnostic whenever you replace a processor or logic board with a new processor or logic board. You must also run the diagnostic if you re-install the same processor but in a different connector from the one in which it was originally installed. Apple Service Diagnostic for Power Mac G5 is available as a download from http://www.info.apple.com/discimages/.

Note: The calibration process of Apple Service Diagnostic requires a controlled environment to ensure accurate ambient temperature readings. Computers under test must have the transparent air deflector installed and the door sensor switch must be operable. Units under test should also be located away from heating and air conditioning ventilation systems and the fan exhaust of other machines. Ambient temperature should not go above 77 degrees Fahrenheit or 25 degrees Centigrade.

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