Apple POWER MAC G5 LATE 2004 Service Manual

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Service Source

Power Mac G5 (Late 2004)

Updated: 18 November 2005

© 2004 Apple Computer, Inc. All rights reserved.

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Service Source

Basics

Power Mac G5 (Late 2004)

© 2004 Apple Computer, Inc. All rights reserved.

Overview

Power Mac G5 (Late 2004) is a single-processor 1.8 GHz Power Mac G5 computer that
complements the existing family of dual 2.5 GHz, dual 2.0 GHz, and dual 1.8 GHz Power
Mac G5 models.

Like the other Power Mac G5 models, the Power Mac G5 (Late 2004) computer is
powered by the a 64-bit PowerPC G5 processor. It features 6.4GB per second of fast
memory bandwidth, up to 4 GB of total main memory, three PCI expansion slots, up to 500
GB of internal Serial ATA mass storage, and AGP 8X Pro graphics capabilities.

Overview

Power Mac G5 (Late 2004) Basics - 1

Identification

To identify a particular model of Power Mac G5, check the computer’s serial number,
which lists the model’s configuration. The serial number is located directly below the air
deflector inside the side access panel.

The Power Mac G5 (Late 2004) computer is also distinguised from earlier Power Mac G5
models by the physical differences noted in the graphic below.

Identification

Power Mac G5 (Late 2004) Basics - 2

What’s New

Overview

Microprocessor: The Power Mac G5 (Late 2004) computer has a single 1.8 GHz

PowerPC G5 processor.

Processor system bus: The processor interface system bus runs at one-third the speed

of the system processor.

Memory bus: The main memory bus is 128 bit 400 MHz.

System management unit: Power Mac G5 (Late 2004) uses an advanced system

management unit (SMU) to manage thermal and wattage conditions, while keeping
acoustic noise to a minimum. The SMU replaces the PMU of previous Power Mac G5
models.

DDR SDRAM: The computer has four DIMM slots for 184 pin DIMMs (dual inline memory

modules) using unbuffered DDR (double data rate) SDRAM 64-bit, 400 MHz (PC3200)
devices for a maximum of 4 GB.

Graphics card: The computer comes standard with the Nvidia GeForce Fx 5200 Ultra

with 64 MB RAM. Available as configure-to-order (CTO) options are the ATI Radeon 9800
XT with 256 MB RAM, the ATI Radeon 9600 XT with 128 MB RAM, the Nvidia GeForce
6800 GT DDL with 256 MB RAM, and the Nvidia GeForce 6800 Ultra DDL with 256 MB
RAM.

PCI expansion slots: The computer includes three 64-bit, 33 MHz PCI slots. PCI-X cards

are not supported.

Hard drives: An internal 7200 rpm Serial ATA (SATA) hard drive occupies one of two drive

bays and functions as the default boot drive. A second SATA drive is available as a CTO
option. Power Mac G5 (Late 2004) comes standard with an 80 GB SATA hard drive, and
160 GB and 250 GB SATA drives are available as CTO options.

What’s New

Power Mac G5 (Late 2004) Basics - 3

PowerPC G5 Processor

The processor used in the Power Mac G5 (Late 2004) has the following features:

• Single 1.8 GHZ processor

• 64-bit PowerPC implementation with 42-bit physical memory addressing

• Core runs at three times the bus speed

• Superscalar execution core supporting more than 200 in-flight instructions

• Two independent double-precision floating point units

• Velocity Engine: 128-bit-wide vector execution unit

• 64K L1 instruction cache, 32K L1 data cache per processor

• Built-in 512 KB backside L2 cache per processor

• Two independent, unidirectional 600 MHz frontside buses supporting 4.8 GBps data
throughput

System Management Unit (SMU)

The advanced system management unit of the Power Mac G5 (Late 2004) employs
advanced thermal and wattage management to keep acoustic noise of the fans to a
minimum. The enclosure is divided into discrete zones, each with independently controlled
fans bringing in cool air from the front of the enclosure, directing it over system
components and exhausting it out the rear. Temperature and power consumption are
monitored by the operating system, which communicates with the SMU, which in turn
controls and monitors fan operation. Note that if Mac OS X is not booted, thermal
management must be provided by the alternate development operating system.

The SMU monitors the wattage from 0 to 100 W. The fan speeds are increased
proportionally, where 100 W operates the fans at highest speed. The wattage calculation
does not include the 25 V ADC power output.

What’s New

Power Mac G5 (Late 2004) Basics - 4

DDR Memory

In the Power Mac G5 (Late 2004) computer, PC3200/400 DDR-SDRAM DIMMs must be
installed in pairs of equal size and speed. Memory from older Macintosh computers is not
compatible. Do not try to install non-DDR memory as it will not fit in the DIMM slots and
could cause damage.

The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB
DIMMs installed in the two DIMM slots marked “1.” You can add DIMMs, provided they are
installed as a pair of equal size, in the two DIMM slots marked “2.” A diagram on the logic
board near the DIMM slots illustrates how the pairs must be installed.

What’s New

Graphics Cards

The standard Power Mac G5 (Late 2004) computer comes with an Nvidia GeForce FX
5200 Ultra graphics card installed. The supported graphics cards are shown below:

Graphics Card Video SDRAM Connectors

Nvidia GeForce FX 5200 Ultra 64 MB DDR ADC and DVI

ATI Radeon 9600 XT (CTO) 128 MB DDR ADC and DVI

ATI Radeon 9800 XT (CTO) 256 MB DDR ADC and DVI

Nvidia GeForce 6800 GT DDL (CTO) 256 MB DDR

Nvidia GeForce 6800 Ultra DDL (CTO) 256 MB DDR

The CTO ATI Radeon 9800 XT, Nvidia GeForce 6800 GT DDL, and Nvidia GeForce 6800
Ultra DDL cards occupy both the AGP slot and the adjacent PCI slot. For this reason, the
number of available PCI slots is reduced from three to two.

Power Mac G5 (Late 2004) Basics - 5

Two dual-link DVIs

Two dual-link DVIs

All graphics cards support dual displays in either extended desktop or video mirroring
mode, and support digital resolutions up to 1920x1200 pixels and analog resolutions up to
1600x1200 pixels. The Nvidia GeForce 6800 graphics cards support resolutions up to
2560 by 1600 pixels.

The display memory on the AGP card is separate from the main memory. The display
memory consists of 64 MB (or 128 MB and 256 MB CTO) of DDR devices configured to
make a 128-bit data bus. The display memory cannot be expanded by the user.

Ports

The following ports are included on the front and back panels of Power Mac G5 (Late

2004). The ports are the same as on the original Power Mac G5 computer. For illustrations

of the port locations, see the “External Views” topic in the Views chapter.

Front

• Power button

• Headphone port

• USB 2.0 port

• FireWire 400 port

Rear

• AirPort antenna port

• Bluetooth antenna port

• Optical audio-out port

• Optical audio-in port

• Audio line-out port

• Audio line-in port

• USB 2.0 ports (two ports)

• FireWire 400 port

• FireWire 800 port

• 10/100/1000Base-T Ethernet port

• Modem port

What’s New

Power Mac G5 (Late 2004) Basics - 6

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Service Source

Take Apart

Power Mac G5 (Late 2004)

© 2004 Apple Computer, Inc. All rights reserved.

General Information

Orientation

For most take-apart procedures, it is recommended that you lay the computer on its side
before removing or installing the part. For proper operation, however, Apple recommends
that the unit be run in the upright position. The computer should never be operated on its
side with the access panel facing down.

Tools

The following tools are required to service the computer:

• Magnetic Phillips screwdriver

• Flat-blade screwdriver

• Jeweler’s flat-blade screwdriver

• Needlenose pliers

• Small wire cutter

• Mat knife or Xacto knife (to remove locking rivet on heatsink cover)

• Cup hook (to remove locking rivet)

• Small wooden stick (to remove locking rivet)

• Small mirror (for seeing small boards inside the enclosure)

• Soft cloth (to protect removed parts from scratches)

Parts Requiring Enclosure Replacement

The following are not separate, orderable parts. To replace them, you must replace the
enclosure.

• Media fan

• Hard drive locking latches

• Hard drive bay

• Optical drive levers

• Media shelf

• Power harness cable, including hard drive power cables

• Air deflector sensor cable

• Media bay sensor cable

• Rear panel latch

General Information

Power Mac G5 (Late 2004) Take Apart - 1

Opening the Computer

Tools

No tools are required for this procedure.

Preliminary Steps

1. Shut down the computer.

Warning: Always shut down the computer before opening it to avoid damaging its

internal components or the components you are installing. Do not open the computer
or attempt to install items inside it while it is on.

2. Wait 5 to 10 minutes to allow the computer’s internal components to cool.

Warning: After you shut down the system, the internal components can be very hot.

You must let the computer cool down before continuing.

3. Unplug all external cables from the computer except the power cord.

4. Touch the metal PCI access covers on the back of the computer to discharge any

static electricity from your body.

Important: Always discharge static before you touch any parts or install any

components inside the computer. To avoid generating static electricity, do not walk
around the room until you have finished working and closed the computer.

5. Unplug the power cord.

6. Put on an ESD wrist strap.

Opening the Computer

Power Mac G5 (Late 2004) Take Apart - 2

Procedure

1. Hold the side access panel and lift the latch on the back of the computer.

Warning: The edges of the access panel and the enclosure can be sharp. Be very careful

when handling them.

2. Remove the access panel and place it on a flat surface covered by a soft, clean cloth.

Replacement Note: Make sure the latch is in the up position before replacing the access

panel. If the latch is down, the access panel will not seat correctly in the enclosure.

Opening the Computer

Power Mac G5 (Late 2004) Take Apart - 3

3. Remove the air deflector and place it on a soft, clean cloth.

Replacement Note: To replace the air deflector, insert the three tabs on the bottom edge

of the deflector into the three slots in the bottom frame of the enclosure. Then swing the
deflector up flush against the top frame of the enclosure.

Important: Make sure you re-install the air deflector before replacing the access panel. If

the air deflector is not installed, the computer will not function properly.

Opening the Computer

Power Mac G5 (Late 2004) Take Apart - 4

Serial ATA Hard Drive

The Power Mac G5 computer can accommodate two serial ATA hard drives in its internal
hard drive bay. In most configurations, a single hard drive occupies the top portion of the
bay. You can install one additional serial ATA hard drive in the empty slot in the bay.

Important: Use the original Apple cables that came with the Power Mac G5 when

installing ATA hard drives.

Tools

The only tool required for this procedure is a Phillips screwdriver.

Preliminary Steps

Before you begin, open the computer.

Part Location

Serial ATA Hard Drive

Power Mac G5 (Late 2004) Take Apart - 5

Procedure

1. Release the drive locking latch by rotating it up.

2. Disconnect the drive data cable and power cable from the hard drive.

3. Pull the drive out of the drive bay, being careful not to touch the bottom of the drive.

Note: If you encounter resistance, use a flatblade screwdriver to release the latches

on the drive bay rails as you pull the drive out of the bay. (See circled areas on the
illustration below.) If two drives are installed, remove the bottom drive first.

Important: If the printed circuit board (PCB) is exposed on the bottom of the hard drive,

hold the drive by its sides. To avoid damaging the replacement drive, take care not to touch
the PCB during installation.

Serial ATA Hard Drive

Power Mac G5 (Late 2004) Take Apart - 6

Replacement Note: If you are replacing a hard drive with a new drive, transfer the four

guide screws from the sides of the original drive to the new drive. If you are installing an
additional drive, transfer the guide screws from the side of the hard drive bay to the drive.

Replacement Note: When replacing the top drive, make sure the guide screws align with

the middle slot of the drive bay, and then gently push the drive into the bay until it snaps
into place in the top position.

When installing a bottom drive, align the guide screws with the bottom slot of the drive bay
and slide the drive in until it snaps into place.

Serial ATA Hard Drive

Power Mac G5 (Late 2004) Take Apart - 7

Serial ATA Hard Drive Data Cable

Tools

The only tool required for this procedure is a small wire cutter.

Preliminary Steps

Before you begin, open the computer and remove the hard drive(s).

Part Location

Serial ATA Hard Drive Data Cable

Power Mac G5 (Late 2004) Take Apart - 8

Procedure

Upper Hard Drive Data Cable

1. Clip off the connector from the hard drive end of the upper hard drive data cable.

2. Disconnect the cable from the logic board, pull the cable out of the hard drive bay, and

remove the cable from the enclosure.

Serial ATA Hard Drive Data Cable

Power Mac G5 (Late 2004) Take Apart - 9

Replacement Note: When installing the replacement upper hard drive cable, first route

the cable through the opening in the hard drive bay.

Then install the upper hard drive with the cable routed below the drive, and connect the
cable to the drive as illustrated.

Serial ATA Hard Drive Data Cable

Power Mac G5 (Late 2004) Take Apart - 10

Lower Hard Drive Data Cable

1. Clip off the connector from the hard drive end of the lower hard drive cable.

2. Disconnect the cable from the logic board, pull the cable out of the hard drive bay, and

remove the cable from the enclosure.

Serial ATA Hard Drive Data Cable

Power Mac G5 (Late 2004) Take Apart - 11

Replacement Note: When installing the replacement lower hard drive cable, first route the

cable through the opening in the hard drive bay.

Then install the lower hard drive with the cable routed above the drive, and connect the
cable to the drive as illustrated.

Serial ATA Hard Drive Data Cable

Power Mac G5 (Late 2004) Take Apart - 12

Optical Drive

Important: When installing a replacement optical drive, use the original Apple cables that
came with the Power Mac G5.

Tools

No tools are required for this procedure.

Preliminary Steps

Before you begin, open the computer.

Part Location

Optical Drive

Power Mac G5 (Late 2004) Take Apart - 13

Procedure

1. Disconnect the optical drive ribbon cable from the logic board. (The cable connector is

located under the media shelf that holds the optical drive.)

2. Push the optical drive levers out to release the drive.

Optical Drive

Power Mac G5 (Late 2004) Take Apart - 14

3. 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.

4. Disconnect the power cable from the drive.

5. Route the drive ribbon cable out through the opening in the media shelf and remove

the drive and ribbon cable from the computer.

Optical Drive

Power Mac G5 (Late 2004) Take Apart - 15

6. 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 the replacement
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.

Optical Drive

Power Mac G5 (Late 2004) Take Apart - 16

7. 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.

8. 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.

Optical Drive

Power Mac G5 (Late 2004) Take Apart - 17

Memory (DIMMs)

Power Mac G5 (Late 2004) computers have four Dual Inline Memory Module (DIMM) slots.
Each slot accepts 400 Mhz Double-Data-Rate (DDR) Synchronous Dynamic Random­Access Memory (SDRAM) devices.

The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB
DIMMs installed in the two DIMM slots marked “1.” You can add DIMMs, provided they are
installed as a pair of equal size, in the two DIMM slots marked “2.” A diagram on the logic
board near the DIMM slots illustrates how the pairs must be installed.

Memory (DIMMs)

Power Mac G5 (Late 2004) Take Apart - 18

DIMMs must fit these specifications:

• 400 MHz DDR

• 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 Macintosh
computers is not compatible with the Power Mac G5. Do not use older memory, even if it
fits into the DIMM slots.

Tools

No tools are required for this procedure.

Preliminary Steps

Before you begin, open the computer, and lay it on its side with the access side facing up.

Part Location

Memory (DIMMs)

Power Mac G5 (Late 2004) Take Apart - 19

Procedure

1. Locate the DIMM slots on the logic board.

2. Open the ejectors on the DIMM slot by pushing them out to the sides.

3. Holding the DIMM by both top corners, lift it straight up out of the computer.

Replacement Note: Align the DIMM in the slot and push both ends of the DIMM down
until the tabs are vertical and the ejectors snap into place.

Important: Do not touch the DIMM connectors. Handle the DIMM only by the edges.

Memory (DIMMs)

Power Mac G5 (Late 2004) Take Apart - 20

AGP/PCI Card

Power Mac G5 computers have four expansion card slots, three of which accommodate
Peripheral Component Interconnect (PCI) cards and one that accepts an advanced
graphics port (AGP) video card. AGP cards and PCI cards have different connectors, so
you cannot insert a PCI card into the AGP slot.

Note: Maximum power consumption for all four expansion slots (the three PCI expansion
cards and the AGP card) should not exceed 90 watts (W).

AGP/PCI Card

AGP Cards

The AGP video card, installed in slot 1, contains the graphics processor unit (GPU) and
provides the computer’s display ports. Slot 1 is designed specifically to accept AGP cards.

PCI Cards

The remaining three expansion slots, labeled 2, 3, and 4, accommodate PCI cards up to
12 inches long.

Note: Certain high-performance AGP graphics cards, when installed in slot 1, block
access to the adjacent PCI slot. In this case, PCI cards can be installed in slots 3 and 4
but not in slot 2.

Power Mac G5 (Late 2004) Take Apart - 21