Apple powermac_g5 Service Manual

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Service Source

Power Mac G5

Updated: 16 September 2003

Power Mac G5

Power Mac G4 -

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Service Source

Basics

Power Mac G5

Overview

Power Mac G5 is a 64-bit desktop computer powered by the PowerPC G5 processor. It offers memory expansion up to 8GB,1 GHz front-side bus, and advanced 64-bit computation, while running existing 32-bit applications natively. The computer also includes serial ATA hard drives, high-end graphics capabilities, and computer-controlled cooling based on four independent zones. Standard conﬁgurations are listed below.

Overview

1.6 GHz Uni 1.8 GHz Uni 2 GHz Dual

800 MHz frontside bus 900 MHz frontside bus 1 GHz frontside bus 256 MB DDR333 SDRAM,

expandable to 4 GB 80 GB Serial ATA drive 160 GB Serial ATA drive 160 GB Serial ATA drive SuperDrive SuperDrive SuperDrive Three PCI slots Three PCI-X slots Three PCI-X slots NVIDIA GeForce FX 5200

Ultra video card 56K internal modem 56K internal modem 56K internal modem

512 MB DDR400 SDRAM, expandable to 8 GB

NVIDIA GeForce FX 5200 Ultra video card

512 MB DDR400 SDRAM, expandable to 8 GB

ATI Radeon 9600 Pro video card

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Serial Number Location

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.

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Power Mac G5 Basics

Serial Number Location

What’s New

Overview

PowerPC G5

processor running at either 1.6, 1.8, or 2.0 GHz, well beyond the speeds of G4 processors.

Serial ATA hard drives

Power Mac G5 offer up to 150 MB/s data throughput. The 7200 rpm drives come in 80, 160, or 250 GB capacity.

PCI-X slots

expansion cards that demand high performance. Both 100 and 133 MHz PCI-X slots are included in higher-end Pow er Mac G5 computers. For more inf ormation, see the “A GP/PCI Card” topic in the Take Apart chapter.

8x AGP bus

graphics card. Both NVIDIA and ATI graphics cards are offered for the Power Mac G5.

USB 2.0

accommodates more high speed peripherals.

Digital audio in and out

ports, allowing for optical audio input and output. These ports are in addition to the existing analog sound input and output ports.

Cooling zones

cooling zones in the Power Mac G5. Each zone is software-controlled by the system to only cool when necessary, making for a more efﬁcient (and quieter) cooling solution.

— The Power Mac G5 computer incudes the new 64-bit PowerPC G5

— Unlike older parallel drives, the new serial ATA drives in the

—Higher-bandwidth PCI slots allow for greater amounts of data when using

— This bus provides a higher amount of data transfer to and from the

—All USB ports on the Power Mac G5 support the USB 2.0 standard, which

—The Pow er Mac G5 introduces two ne w optical audio (S/PDIF)

— Nine case fans and blowers are logically grouped into four separate

What’s New

Controller chips

chips that use “hyper-transport” technology. This new technology allows chips to talk to each other much faster than older Macs. The overall bandwidth of the system is also greatly improved.

ATA/100 bus for optical drives

data much faster.

Interleaved DDR RAM

performance. Different models require either DDR 333 or DDR 400 RAM. DIMMs m ust be installed in pairs of equal size and kind. For more information, see the “Memory (DIMMs)” topic in the Take Apart chapter.

— The Power Mac G5 includes Northbridge and Southbridge controller

— This technology allows optical storage to read/write

—The Power Mac G5 requires pairs of DIMMs, which increases

Power Mac G5 Basics -

DDR Memory

Depending on the model, Power Mac G5 computers have either four or eight Dual Inline Memory Module (DIMM) slots for Double-Data-Rate (DDR) Synchronous Dynamic Random-Access Memory (SDRAM) devices. The computers ship with a minimum of 256 MB of RAM, installed as a pair of 128 MB DIMMs in two of the DIMM slots. You can install additional DIMMs, provided they are installed in pairs of equal size. A diagram marked on the logic board near the slots illustrates how the pairs must be installed.

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Power Mac G5 Basics

To determine the types of DIMMs to install, refer to the table below:

DIMM Slots DIMM speed Maximum amount

4 (two banks of 2 slots) 333 MHz, PC 2700 up to 4 GB 8 (two banks of 4 slots) 400 MHz, PC 3200 up to 8 GB

In addition, DIMMs must ﬁt these speciﬁcations:

• 2.5 volt

• 84-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)

What’s New

Video

The Power Mac G5 computer comes with a graphics card installed in the AGP 3.0compliant 8x Pro slot.

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

The supported graphics cards are shown below:

Graphics Video SDRAM Connectors

NVIDIA GeForce FX 5200 Ultra 64 MB DDR ADC and DVI-I ATI Radeon 9600 Pro 64 MB DDR ADC and DVI-I ATI Radeon 9800 Pro (CTO) 128 MB DDR ADC and DVI-I

Fan Controller

The Power Mac G5 system employs advanced thermal management to keep acoustic noise to a minimum. The system is divided into discrete zones, each with independently controlled fans bringing in cool air from the front of the enclosure, directing it through ducts and exhausting it out the rear. Temperature and power consumption are monitored by the operating system, which communicates with the Fan Control Unit, which in turn controls and monitors fan operation. Note that if Mac OS X is not booted, thermal management will not work correctly.

Important:

Diagnostic whenever y ou replace a processor or logic board with a ne w 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. For more information, see “Thermal Calibration” in the Troubleshooting chapter.

To ensure proper fan and temperature control, you must run Apple Service

Optical A udio

What’s New

Digital data is transmitted to and from the optical audio I/O using special optical cables. The 7.5 mm digital optical connectors on the cables, commonly referred to as TOSLink, are for both input and output and conform to the IEC60874-17 connector standard.

The TOSLink friction-lock type F-05 connectors are available from pro-audio, musician’s supply, hi-ﬁ, and other retailers.

Power Mac G5 Basics -

Analog audio signals are converted to digital data internally. All audio is handled digitally inside the computer, including audio data from the CD or DVD drive and from devices connected to the USB and FireWire ports. Audio data is converted to analog form for output to the internal speaker, the headphones, or the analog output port.

Wireless

The Power Mac G5 supports an optional internal Apple Bluetooth module that enables short-range wireless connections between desktop and laptop computers and a host of other peripheral devices. Bluetooth support is built into Mac OS X and compliant with Bluetooth speciﬁcation v1.1. It operates on a globally available 2.4 GHz frequency band (ISM band) for worldwide compatibility and has a maximum throughput of 1Mbps.

The Bluetooth technology supports the following proﬁles:

• synchronization —enables synchronization of devices over Bluetooth

• serial —provides a wireless serial connection to other Bluetooth devices

• dial-up networking (DUN) — enables a mobile phone to act as a modem

• object push —enables the transfer of files between Bluetooth devices

Important:

attached to the Bluetooth port and the external AirPort antenna must be attached to the AirPort port on the back panel of the Power Mac G5.

For proper range and operation, the external Bluetooth antenna must be

Ports

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

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Power Mac G5 Basics

What’s New

Power Mac G5 Basics -

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Service Source

Take Apart

Power Mac G5

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:

• Long-handled magnetic Phillips screwdriver (10-inch shaft)

• Short-handled magnetic Phillips screwdriver

• Flatblade screwdriver

• Jeweler’s flatblade screwdriver

• Needlenose pliers

• Long-handled hex wrench

• Tape (for temporarily holding cables out of the way)

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

• Soft cloth (for protect removed parts from scratches)

General Information

Power Mac G5 Take Apart -

Opening the Computer

Tools

No tools are required for this procedure.

Preliminary Steps

1. Shut down the computer.

Warning:

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:

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:

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.

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

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

Always discharge static before you touch any parts or install any

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Power Mac G5 Take Apart

Opening the Computer

Procedure

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

Warning:

when handling them.

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

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

Replacement Note:

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

Opening the Computer

Make sure the latch is in the up position before replacing the access

Power Mac G5 Take Apart -

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

Replacement Note:

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:

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

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

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

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Power Mac G5 Take Apart

Opening the Computer

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 to the empty slot in the bay.

Important:

installing ATA hard drives.

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

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 Take Apart -

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.

Important:

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

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

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Power Mac G5 Take Apart

Serial ATA Hard Drive

4. If you are replacing the drive with a new drive, transfer the four hard drive guide screws from the sides of the original drive to the replacement drive.

5. If you are installing an additional drive, remov e the f our guide scre ws from the left side of the hard drive bay and screw them into the sides of the new drive.

Serial ATA Hard Drive

Power Mac G5 Take Apart -

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 ba y and slide the drive in until it snaps into place.

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Serial ATA Hard Drive

Optical Drive

Important: When installing a replacement optical drive, use the original Apple cab les 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 Take Apart - 9

Procedure

1. Disconnect the optical drive ribbon cable from the logic board. (The cab le connector is located under the media shelf that holds the optical drive.)

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

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Optical Drive

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

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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 each drive. Use the

standoffs from the bag marked with the same manufacturer’s name as printed on the drive.

Note for Combo Drives: Transfer the standoffs from the original drive to the

replacement drive.

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Optical Drive

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 transf er 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 Take Apart - 13

Front Inlet Fan(s)

The front inlet fan assembly consists of one or two f ans in a plastic brac k et. 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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Front Inlet Fan(s)

Procedure

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

Front Inlet Fan(s)

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2. 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.

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Front Inlet Fan(s)

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.

Front Inlet Fan(s)

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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

4 333 MHz, PC 2700 up to 4 GB 8 400 MHz, PC 3200 up to 8 GB

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Memory (DIMMs)

In addition, DIMMs must ﬁt these speciﬁcations:

• 2.5 volt

• 84-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, lay it on its side with the access side facing up, and remove the front inlet fan assembly.

Part Location

Memory (DIMMs)

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