K Service Source

Power Mac G4/

Macintosh Server G4

Power Mac G4 (AGP Graphics/Gigabit Ethernet/Digital Audio/

QuickSilver/QuickSilver 2002/QuickSIlver 2002ED),

Power Mac G4 (PCI Graphics),

Macintosh Server G4

Overview

Product Description

The Power Mac G4 is the first Power Mac computer based on the PowerPC G4 processor. Some configurations also include support for wireless networking, dual-channel USB, Gigabit Ethernet, dual processing, digital audio, and a wake/sleep power management feature.

Identifying Versions of

the Power Mac G4

There are six models of

Power Mac G4 computers:

AGP Graphics, PCI Graphics,

Gigabit Ethernet, Digital

Audio, QuickSilver, and

QuickSilver 2002.

Power Mac G4 (QuickSilver and QuickSilver 2002) computers are easy to identify. Unlike other Power Mac G4 models, these models have a silver-colored case. They also have a recessed speaker on the front panel.

To identify the other Power Mac G4 models, check the I/O panel at the back of the computer. The sound ports align horizontally in the lower half of the I/O panel on PCI Graphics models and vertically on AGP Graphics/ Gigabit Ethernet models. On Digital Audio models, the sound ports are in the upper half of the I/O panel. In addition, Digital Audio models include four expansion slots, instead of three slots on PCI/AGP Graphics/Gigabit Ethernet models.

To further distinguish Gigabit Ethernet models from AGP Graphics models, check the logic boards. AGP Graphics boards include an internal FireWire connector at J9; Gigabit Ethernet boards do not include the connector.

New Technologies

While the Power Mac G4 family of computers all use the innovative PowerPC G4 processor, they also include a range of other new hard- ware and architectures. For information on the latest technolgies, check the Apple Knowledge Base.

Features

Standard Con???gurations

Processor

???350 MHz,400 MHz, 450 MHz, 466 MHz, 500 MHz, 533 MHz, 733 MHz, 800 MHz, 867 MHz, 933 MHz, or 1 GHz PowerPC G4 processor; dual processors on some configurations

???Velocity Engine vector processing unit with 162 integrated Single Instruction Multiple Data (SIMD) instructions

???Full 128-bit internal memory data paths

???Powerful floating-point unit supporting single-cycle, double-precision calculations

???Data stream prefetching operations supporting four

simultaneous 32-bit data streams

???L2 or L3 cache

???100-MHz system bus (PCI Graphics/AGP Graphics/ Gigabit Ethernet) or 133-MHz system bus (QuickSilvers/Digital Audio)

Memory

???64, 128, 256, or 512 MB of PC-100 SDRAM (PCI Graphics/AGP Graphics/Gigabit Ethernet) or

64, 128, 256, or 512 MB of PC-133 SDRAM (QuickSilvers/Digital Audio)

???Four DIMM slots (PCI Graphics/AGP Graphics/Gigabit Ethernet) or three DIMM slots (QuickSilvers/Digital Audio)

Storage

???One of the following hard drives: 10, 13, 20, 27, 30, 40, 60, or 80 GB Ultra ATA

???One of the following optical drives:

???CD-ROM drive

???CD-RW drive

???DVD-ROM drive

???DVD-RAM drive

???DVD-R/CD-RW drive

???DVD/CD-RW drive

???Optional 100 or 250 MB Zip drive

???Three 3.5-inch hard drive expansion bays

???One ATA drive preinstalled in standard configurations

???Support for up to two internal ATA drives

???Support for up to three internal SCSI drives

Graphics Support

???Video card installed in a dedicated graphics slot (either a PCI slot or an AGP slot)

???Support for up to 1,600 by 1,200 pixel resolution at 32 bits per pixel and up to 85-Hz refresh rate

???15-pin mini D-Sub VGA connector

???ADC connector for digital flat-panel display (not available on PCI Graphics computers)

???Support for independent video output to two monitors (with NVIDIA TwinView video card)

Electrical Requirements and Agency Approvals

???Line voltage: 115V AC (90V to 132V AC) or 230V AC (180V to 264V AC)

???Frequency: 47 to 63 Hz, single phase

???Maximum continuous power (not including display): 200W EPA ENERGY STAR and Blue Angel compliant (some configurations)

Environmental Requirements

???Operating temperature: 50?? to 95?? F (10?? to 35?? C)

???Storage temperature: -40?? to 116?? F (-40?? to 47?? C)

???Relative humidity: 5% to 95% noncondensing

???Maximum altitude: 10,000 feet (3,048 m)

Size and Weight

???Height: 17.0 inches (43.2 cm)

???Width: 8.9 inches (22.6 cm)

???Depth: 18.4 inches (46.7 cm)

???Weight: 30.0 pounds (13.6 kg)

Note: Storage devices and interfaces vary among configurations.

Con???gure-to-Order Options

The configure-to-order options are available from the Apple Store. For more information, view the options online at http://store.apple.com.

Views

Power Mac G4 (AGP Graphics/Gigabit Ethernet) Views

FireWire Ports (2)

Ethernet Port

USB Ports (2)

Sound Input Port

Sound Output Port

Internal

Modem Port

(Optional)

VGA Monitor Port

(Slot 1: AGP)

Access Covers for

Expansion Slots

Power Mac G4 (Digital Audio) Views

Internal Modem Port

(Optional)

Headphone Jack

Digital Audio

Jack

CD or DVD Drive

Power Mac G4 (AGP Graphics/Gigabit Ethernet) Internal Locator

Drive Bay 1

Drive Bay 2

Drive Bay 3

PCI Slots (3)

AGP Slot

SDRAM

Slots (4)

Power Mac G4 (QuickSilvers/Digital Audio) Internal Locator

Drive Bay 3

Drive Bay 2

Drive Bay 1

PCI Slots (4)

AGP Slot

SDRAM Slots (3)

Repair Strategy/Warranty

Strategy and Ordering

Service Power Mac G4 computers through module exchange and parts replacement.

Apple-authorized service providers planning to support the computer systems covered in this manual may purchase service modules and parts to develop servicing capability. To order parts, use the AppleOrder (U.S. only) or ARIS (Canada only) system and refer to the Power Mac G4 Service Price Pages.

Large businesses, universities, and K-12 accounts must provide a purchase order on all transactions, including orders placed through the AppleOrder (U.S. only) or ARIS (Canada only) system.

USA Ordering

U.S. service providers not enrolled in AppleOrder may fax their orders to Service Provider Support (512-908- 8125) or mail them to:

Apple Computer, Inc.

Service Provider Support / MS 212-SPS

2323 Ridgepoint Drive

Austin, TX 78754

For U.S. inquiries, please call Service Provider Support (800 - 919 - 2775, option #1) .

Canadian Ordering

Canadian service providers not enrolled in ARIS may fax their orders to Service Provider Support in Canada (800- 903-5284). For Canadian inquiries, please call Service Provider Support (800-217-9517).

Warranty

U.S. Only

Power Mac G4 computers are covered under the Apple One- Year Limited Warranty. The AppleCare Protection Plan is also available for these products. Service providers are reimbursed for warranty and AppleCare Protection Plan repairs. For pricing information, refer to Service Price Pages.

Canada Only

Power Mac G4 computers are covered under the Apple One- Year Limited Warranty. The AppleCare Protecion Plan is also available for these products. Service providers are reimbursed for warranty and AppleCare Protection Plan repairs. For pricing information, refer to Service Price Pages.

General

Identifying Models of

the Power Mac G4

There are six models of Power Mac G4 computers: AGP Graphics, PCI Graphics, Gigabit Ethernet, Digital Audio, QuickSilver, and QuickSilver 2002.

Power Mac G4 (QuickSilver and QuickSilver 2002) computers are easy to identify. Unlike other Power Mac G4 models, these models

Tools

??? Flatblade screwdriver

??? Phillips screwdriver

??? Allen wrench (2.5 mm) to remove the power supply, side panels, top and rear handles, and front and rear supports

??? Jeweler???s screwdriver to remove the I/O panel cover and antenna

??? Needlenose pliers to remove the right and left side panels

??? ESD mat

Procedures

Opening the Computer

No preliminary steps are required before you begin this procedure.

Video Card

Before you begin, do the following:

??? Open the side access panel.

??? Remove the external video cable.

Note: The AGP video card is always installed in slot 1 (short slot). The DVD decoder module is used only in Power Mac G4 (PCI Graphics) computers.

Replacement Note: If the replacement card does not have a fence already installed, attach the fence enclosed in the box. Using a Phillips screwdriver, install the two small Phillips screws on either side of the ADC connector and the two large Phillips screws on the fence side tabs. Using pliers, install the two jack-nut screws on either side of the VGA connector.

Take Apart Modem, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers - 10

Modem, AGP

Graphics/Gigabit

Ethernet/Digital Audio/

QuickSilvers

Note: The Power Mac G4 (AGP Graphics/Gigabit Ethernet/Digital Audio/ QuickSilver/QuickSilver 2002) modem requires a modem filter; the two are separate parts. To remove the modem, you do not need to remove the modem filter.

Before you begin, open the side access panel.

Take Apart Modem, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers - 11

Warning: Use care when disconnecting or connecting the modem to the J27 connector on the logic board. Bent pins in the J27 connector could cause a short in the logic board.

1. Remove the two modem mounting screws.

2. Lift the modem straight up to disconnect it from the logic board.

Take Apart Modem, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers - 12

3. Disconnect the modem filter cable from the modem.

4. Remove the modem from the computer.

Replacement Note: After replacing an international modem, use the Modem Country Selector utility to set the modem to the correct country.

Take Apart Modem Filter, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers

Modem Filter, AGP

Graphics/Gigabit

Ethernet/Digital Audio/

QuickSilvers

Before you begin, do the following:

??? Open the side access panel.

??? Remove the logic board.

Take Apart Modem Filter, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers

1. Remove the screw that secures the modem filter to the I/O panel.

Take Apart Modem Filter, AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilvers

2. Free the modem filter cable from the chassis guides and remove the modem filter from the computer.

Modem, PCI Graphics

Before you begin, open the side access panel.

Warning: Use care when disconnecting or connecting the modem to the J27 connector on the logic board. Bent pins in the J27 connector could cause a short in the logic board.

2. Remove the screw that secures the modem leg standoff to the logic board.

4. Gently lift up the modem to remove it from the logic board.

Note: If you are replacing the modem, continue with the Take Apart procedures to remove the modem from the bottom modem shield.

Replacement Note: After replacing an international modem, use the Modem Country Selector utility to set the modem to the correct country.

FireWire Board, PCI

Graphics

Note: The FireWire board is used only in Power Mac G4 (PCI Graphics) computers. Power Mac G4 (AGP Graphics/Gigabit Ethernet/ Digital Audio/QuickSilver/ QuickSilver 2002) computers have FireWire built into the logic board.

Before you begin, do the following:

??? Open the side access panel.

??? Remove the modem.

Processor Fan, Power

Mac G4 (QuickSilvers)

Before you begin, open the side access panel.

Processor Module, Power Mac G4 (QuickSilvers)

Before you begin, do the following:

??? Open the side access panel.

??? Remove the processor fan.

??Warning: The heatsink covering the processor may be hot. If the computer has been recently operating, allow it to cool down before performing this procedure.

Processor Module,

AGP Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, open the side access panel.

??Warning: The heatsink covering the processor may be hot. If the computer has been recently operating, allow it to cool down before performing this procedure.

??Warning: Hold the module as shown when removing or installing it to avoid bending the processor connector pins.

Processor Module, PCI

Graphics

Before you begin, open the side access panel.

Note: The Power Mac G4 (PCI Graphics) processor requires a jumper installed at J25 on the logic board.

Take ApartLogic Board, Power Mac G4 (QuickSilvers) - 47

Logic Board, Power

Mac G4 (QuickSilvers)

Before you begin, open the side access panel and remove the following:

??? video card

??? processor fan

??? processor module

??? PCI cards (if present)

??? modem (if present)

??? AirPort card (if present)

??Warning: Be sure to reinstall the heatsink after completing this procedure. Operating the computer without the heatsink in place

Take Apart Logic Board, AGP Graphics/Gigabit Ethernet/Digital Audio - 50

Logic Board, AGP

Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, open the side access panel and remove the following:

??? video card

??? processor module

??? PCI cards (if present)

??? modem (if present)

??? AirPort card (if present)

Note: While the layout of the Power Mac G4 (Digital Audio) logic board differs from the logic board layout in the illustrations for this

3. For Power Mac G4 (Gigabit Ethernet/ Digital Audio) computers, remove the three processor module standoffs.

Take ApartLogic Board, PCI Graphics - 53

Logic Board, PCI

Graphics

Before you begin, open the side access panel and remove the following:

??? video card

??? PCI cards (if present)

??? modem (if present)

??? FireWire board

SDRAM DIMM

Before you begin, open the side access panel.

Hard Drive, IDE /ATA

Before you begin, open the side access panel.

Note: The Power Mac G4 supports a total of three internal hard drives. It can accommodate up to two Ultra ATA drives in drive bay 3, near the rear of the computer. ATA drives are not supported in drive bay 1 or 2.

Note: You must assign a SCSI ID number to every additional hard drive and the number must not conflict

Hard Drive, Ultra2

LVD SCSI

Before you begin, open the right side access panel.

Note: This computer supports a total of three internal hard drives. If a unit has at least one internal Ultra2 LVD SCSI drive, an Ultra2 LVD SCSI PCI card, and a SCSI data cable, you can connect additional internal and external Ultra2 LVD SCSI devices. The unit???s SCSI data cable supports three internal SCSI drives;

Ultra2 LVD SCSI Card

Before you begin, open the side access panel.

Carrier Support Plate

Note: Perform this procedure only if you must replace the support plate or the cables below the plate.

Before you begin, do the following:

??? Open the side access panel.

??? Remove the hard drive carrier in drive bay 1.

CD/DVD Drive, Power

Mac G4 (QuickSilvers)

Before you begin, open the side access panel.

Note: You remove the drive carrier from the computer with the drives attached to the carrier.

5. Remove the carrier and drives from the computer.

Zip Bezel/Blank Bezel, Power Mac G4 (QuickSilvers)

Before you begin, open the side access panel.

Zip Drive, Power Mac

G4 (QuickSilvers)

Before you begin, open the side access panel.

Note: You remove the drive carrier from the computer with the drives attached to the carrier.

5. Remove the carrier and drives from the computer.

CD/DVD Bezel, PCI/

AGP Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, open the side access panel.

CD/DVD Drive, PCI/

AGP Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, do the following:

??? Open the side access panel.

??? Remove the CD/DVD drive bezel.

Take Apart CD/DVD Drive, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 100

6. Continue sliding the drive carrier out of the computer. Important:

The drive carrier may be difficult to push forward due to the EMI gasket and tape located on the underside of the carrier (directly below the Zip drive).

7. When the carrier is out of the computer, remove the EMI shield from the back of the CD-ROM, DVD-ROM, or DVD-RAM drive.

Take Apart CD/DVD Drive, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 101

Note: Perform the following procedure if you are replacing the CD-ROM, DVD-ROM, DVD-RAM, or Zip drive.

8. Using a Phillips screwdriver, remove the drive carrier mounting screws.

9. Slide the drive(s) out of the carrier.

Replacement Note: The DVD-RAM drive is not as tall as the CD-ROM and DVD-ROM drives. Before screwing the DVD-RAM

Take Apart CD/DVD Drive, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 102

drive back into the carrier, lift the back of the drive slightly so that the drive is flush against the carrier.

Replacement Note: When inserting the drive carrier into the computer, make sure the carrier tab slides into the hole on the stationary drive shelf.

Zip Drive, PCI/AGP

Graphics/Gigabit

Ethernet/Digital Audio

If removing the Zip drive, follow the procedures for removing the CD/DVD Drive.

Important: After you remove the screws mounting the Zip/CD/DVD carrier to the chassis, the carrier may be difficult to push forward due to EMI tape on the carrier???s underside holding it in place. Continue pushing forward until the carrier is released.

Fan, Power Mac G4 (QuickSilvers)

Before you begin, open the side access panel.

Fan, PCI Graphics,

AGP Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, open the side access panel.

Power Supply, Power

Mac G4 (QuickSilvers)

Before you begin, do the following:

??? Open the side access panel.

??? Remove the CD/DVD/Zip

drive carrier.

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 122

Power Supply, PCI/

AGP Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, do the following:

??? Open the side access panel.

??? Remove the CD/DVD drive bezel.

??? Move the CD/DVD/Zip drive carrier forward 1 inch.

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 123

1. Disconnect the power- to-fan connector.

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 124

2. Disconnect the following power cables:

???cables P6 and P7 from the CD-ROM/Zip drive

???Power Mac G4 (PCI Graphics): cable P4 from the front panel board

???main power cable from the logic board

???cable(s) to hard drives

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 125

3. Using a 2.5 mm Allen wrench, remove the three screws on the rear vented panel.

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 126

4. On the inside of the chassis, remove the screw that attaches the power supply to the power supply shelf.

5. Slide the power supply forward toward the front of the computer. Maneuver the power supply (clearing the security bar on the inside and upper chassis) and its cables out of the chassis.

Note: If you are replacing the power supply, remove the power supply bracket

Take Apart Power Supply, PCI/AGP Graphics/Gigabit Ethernet/Digital Audio - 127

and reattach it to the new power supply.

Replacement Note: You must set the power supply voltage switch to the correct setting (115 V in the U.S.) to avoid damaging the computer.

Speaker, Power Mac

G4 (QuickSilvers)

Before you begin, do the following:

??? Open the side access panel.

??? Remove the carrier support plate.

Speaker, PCI/AGP

Graphics/Gigabit

Ethernet/Digital Audio

Before you begin, do the following:

??? Open the side access panel.

??? Remove the carrier support plate.

Front Panel Board, Power Mac G4 (QuickSilvers)

Before you begin, open the side access panel.

Front Panel Board,

PCI/AGP Graphics/

Gigabit Ethernet/

Digital Audio

Before you begin, open the side access panel.

Take ApartAntenna - 140

Antenna

Note: The antenna is routed through the chassis in two ways: under the logic board and through drive bay 1. Do not remove or replace the antenna if it is routed under the logic board. To replace this type of antenna, you must replace the entire chassis.

Before you begin, remove the following:

??? top front handle

??? top panel

??? carrier support plate (if

2. Free the antenna cable from the cable clamp and the fan bracket.

Top Handles, Front

and Rear

No preliminary steps are required before you begin this procedure.

Top Panel

Before you begin, remove the following:

??? top front handle

??? top rear handle

Supports, Front and

Rear

Before you begin, place the computer on an ESD mat and turn the unit upside down.

??Warning: When the computer is upside down or the lower supports are removed, the computer can be unstable.

Lower Panels, Front

and Rear

Before you begin, remove the front and/or rear support.

??Warning: When the computer is upside down or the lower supports are removed, the computer can be unstable.

Front Panel

Before you begin, remove:

??? top front handle

??? lower front support and lower front panel

??? Power Mac G4 (PCI/AGP Graphics/GIgabit Ethernet/Digital Audio): CD/DVD drive bezel and CD/DVD drive carrier

??? Power Mac G4 (QuickSilvers): CD/DVD/ Zip drive carrier

??Warning: When the lower support is removed, the computer can be unstable.

Note: If you are installing a new front panel on Power Mac G4 (QuickSilvers), transfer the blank or Zip bezel from the original panel to the new panel.

Take ApartCD/DVD Drive Door, Power Mac G4 (QuickSilvers) - 154

CD/DVD Drive Door, Power Mac G4 (QuickSilvers)

Before you begin, remove:

??? top front handle

??? lower front support and lower front panel

??? CD/DVD/Zip drive carrier

??? front panel

??Warning: When the lower support is removed, the computer can be unstable.

Rear Vented Panel

Before you begin, remove the following:

??? top rear handle

??? lower rear support

??Warning: When the lower support is removed, the computer can be unstable.

Take ApartLatch Panel - 161

Latch Panel

Before you begin, remove the following:

??? video card

??? PCI cards (if present)

??? Power Mac G4 (PCI Graphics): FireWire board (if present)

??? Power Mac G4 (PCI Graphics): modem (if present)

??? AirPort card (if present)

??? logic board

Take ApartRight Side Access Panel - 163

Right Side Access

Panel

Before you begin, remove the following:

??? PCI cards (if present)

??? video card

??? FireWire board (if present)

??? modem (if present)

??? AirPort card (if present)

??? logic board

Left Side Panel

No preliminary steps are required before you begin this procedure.

I/O Panel, PCI

Graphics

Note: The I/O panel can be removed only in Power Mac G4 (PCI Graphics) computers. The I/O panel in Power Mac G4 (AGP Graphics/Gigabit Ethernet/ Digital Audio/QuickSilver/ QuickSilver 2002) is part of the chassis.

Before you begin, do the following:

??? Open the side access panel.

??? Remove the logic board.

I/O Panel Cover

Before you begin, do the following:

??? Open the side access panel.

??? Remove the logic board.

??? Power Mac G4 (PCI Graphics): Remove the I/O panel.

Take ApartI/O Panel Cover - 175

Note: Because the I/O panel cover can be difficult to remove, take your time prying up the plastic tabs.

1. Using a jeweler???s screwdriver and working from right to left, carefully pry the plastic tabs away from the metal frame. As each tab is released, pull the I/O cover away from the frame.

2. Remove the I/O panel cover from the chassis.

Power Mac G4 (Gigabit Ethernet) Block Diagram

Power Macintosh G4 (PCI Graphics) Block Diagram

Power-On Self Test

There is a power-on self test that resides in the ROM of the Power Mac G4. This test automatically runs whenever the computer is powered on after being fully shut down (the power-on self test does not run if the machine is only restarted). If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.

Power Mac G4 (all models except PCI Graphics):

???1 Beep: No RAM is installed or detected.

???2 Beeps: Incompatible RAM types are installed (for example, both SDRAM and EDO installed).

???3 Beeps: No RAM banks passed memory testing.

???4 Beeps: No good boot images are detected in the boot ROM (and/or there is a bad sys config block).

???5 Beeps: The processor is not usable.

Power Macintosh G4 (PCI Graphics):

???1 Beep: No RAM is installed or detected.

???2 Beeps: Incompatible RAM types are installed (for example, both SDRAM and EDO installed).

???3 Beeps: No RAM banks passed memory testing.

???4 or 5 Beeps: Bad checksum for the remainder of the boot ROM block. The ROM is bad and probably cannot be fixed.

I/O, two crystals, and a CPU. Its function is to:

???Tell the computer to turn on, turn off, sleep, wake, idle, etc.

???Manage system resets from various commands.

???Maintain parameter RAM (PRAM).

???Manage the real-time clock.

Important: Be very careful when handling the main logic board. Remove the battery when handling the logic board so the PMU is not affected. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes, the battery life goes from about five years to about two days if the PMU is not reset. The PMU chip is located on the underside of the logic board at U20; refer to the Power Mac G4 (AGP Graphics/ Gigabit Ethernet/Digital Audio) Logic Board Diagrams for the location of the PMU button.

Many system problems can be resolved by resetting the PMU chip.

Whenever you have a unit that fails to power up, follow this

procedure before replacing any modules:

1.Disconnect the power cord and check the battery in the battery holder (BT1). The battery should read 3.3 to 3.7 volts. If the battery is bad, replace the battery, wait ten seconds, and then reset the PMU (refer to the next step). If the battery is good, go to the next step.

2.Press the PMU reset switch (S1) once on the logic board and then proceed to step 3. Do NOT press the PMU reset switch a second time because it could crash the PMU chip.

3.WAIT ten seconds before connecting the power cord and powering the computer on. If the computer powers on, go to the next step. If the computer does not power on, there is something else wrong with the computer; refer to the symptom/cure chart, ???Startup??? in this chapter.

4.Run Apple Hardware Test and return the computer to the customer.

Note: This entire procedure resets the computer???s PRAM. Be sure to reset the computer???s time, date, and other system parameter settings before returning the computer to the customer.

Logic Board LEDs: Power Mac G4 (all models except PCI

Graphics)

There is one red LED on the Power Mac G4 (AGP Graphics/Gigabit Ethernet/Digital Audio/QuickSilver/QuickSilver 2002) logic boards. It indicates that there is power to the board and does not imply a fault condition. Hardware such as DIMMs and PCI cards should not be installed or removed when the LED is on.

Power Macintosh G4 (PCI Graphics)

Processor Module

The logic board comes with a removable processor module. The processor should rarely fail and should be replaced only as a last resort. Processor modules can be ordered from Service.

Note that when you replace the logic board on a Power Macintosh G4 (PCI Graphics), you must also change the processor jumper block and warranty sticker to be compatible with the processor module. Failure to install the jumper block properly will result in a unit that does not boot up. No jumper block is required for Power Mac G4 (AGP Graphics/Gigabit Ethernet/Digital Audio) processors.

Refer to ???Processor Module??? in the Take Apart chapter for more information.

Resetting the Cuda Chip: Power Macintosh G4 (PCI

Graphics)

The Cuda is a microcontroller chip on the Power Macintosh G4 (PCI Graphics) logic board. Its function is to

???Turn system power on and off.

???Manage system resets from various commands.

???Maintain parameter RAM (PRAM).

???Manage the real-time clock.

Many system problems can be resolved by resetting the Cuda chip (see the Symptom Charts for examples). Press the Cuda reset button on the logic board to reset the Cuda chip. The Cuda reset button is located on the logic board to the right of the battery. Refer to the Logic Board Diagram earlier in this chapter for location information. If you continue to experience system problems, refer to ???Resetting the PCI Logic Board??? in this chapter.

Resetting the PCI Logic Board

Resetting the logic board can resolve many system problems (see the Symptom/Cure tables for examples). Whenever you have a Power Macintosh G4 (PCI Graphics) computer that fails to power up, you should follow this procedure before replacing any modules.

1.Unplug the computer.

2.Press the Power On button on the front of the unit.

3.Open the side access panel.

4.Remove the battery from the logic board.

5.Wait at least 10 minutes before replacing the battery.

6.Make sure the battery is installed in the correct +/- direction.

7.Reassemble the computer and test the unit.

Note: This procedure resets the computer???s PRAM. Be sure to check the computer???s time/date and other system parameter settings afterwards.

Logic Board LEDs: Power Macintosh G4 (PCI Graphics)

There are seven diagnostic LEDs on the Power Mac G4 (PCI

Graphics) logic board. A graphic follows showing their location.

DS1 = ATA drive activity

If a CD and/or Zip are attached to the ATA bus, this LED will illuminate at power/on restart time for a few seconds. After that, it is unlikely it will illuminate again in a trouble-free system. If this light stays on for a prolonged period, this is a sign of trouble on the ATA bus. If devices are connected to the ATA bus and this LED is dark at boot time, that is also likely a sign of trouble. If a hard disk drive is attached to this bus, the LED flickers regularly indicating drive activity (reads/writes).

DS4 and DS5 = USB power for downstream devices

DS5 = USB port 1- lower

DS4 = USB port 2- upper

(There is no DS2 or DS3 on the board.)

When illuminated, these LEDs indicate that the computer is providing power (+5 V) to downstream USB ports. USB devices do not need to be connected in order for these LEDs to illuminate. However, if one or both of the LEDs is not illuminated and a USB device is/was attached (and the system has completed its boot process), then the logic board has removed downstream power because of a trouble condition.

Since the downstream power is controlled individually for each port, it is possible to have these LEDs in a different state: one off and one on. This way if one port has troubled USB devices, the

other port can still be functional. These LEDs are not immediately illuminated at the beginning of a restart or cold power-on. During a successful/normal boot, the sequence will look like:

1.Unit is powered on and other LEDs will illuminate while DS4 and DS5 are off.

2.Then DS4 and DS5 on for a second or two

3.Then off very briefly (1 second)

4.Then back on (confirms secondary PCI bus is initialized and power now available)

These two LEDs are often useful when troubleshooting an unpredictable system. If they stay on (step 4) then the secondary PCI bus has been initialized which happens relatively late in the boot/hardware initializing process.

DS6 = Ultra ATA bus activity

DS6 indicates Ultra ATA bus activity.

DS7 & DS8 = Power Indication

In a working unit, these LEDs should be in sync with each other: both on or both off. If one LED is on and the other is off, there is a problem.

DS9 = CPU Bus Request

When illuminated, this LED indicates that the CPU is requesting the bus. This LED will rarely glow as brightly as the others (like the Ultra ATA LED) given that the CPU is not always requesting the bus, and when it does, the period of time is short. As a result, you may need to watch this LED much more carefully than the others to tell if there is activity. If this LED is ever on continuously and bright, then the system is troubled and likely hung.

Power Macintosh G4 (PCI Graphics) LEDs Locator

DS8

DS9

1.Plug in a known-good power cord into the back of the com- puter. Do not turn on the computer.

2.Power Mac G4 (AGP or PCI) (see Figure 1):

Connect the black lead of the volt meter to pin 16 of the 20- pin power supply connector. Connect the red lead of the volt meter to pin 9 of the power supply connector. The volt meter should measure approximately +5V.

If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the step 4.

If you do measure +5V on pin 9, the power supply is likely OK. Go to the next step for further verification.

3.Power Mac G4 (Gigabit Ethernet/Digital Audio) (see Figure 2 ) :

Connect the black lead of the volt meter to pin 11 of the 22- pin power supply connector. Connect the red lead of the volt meter to pin 22 of the power supply connector. The volt meter should measure approximately +28V.

If you do not get a reading of +28V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.

If you do measure +28V on pin 22, the power supply is likely OK. Go to the next step for further verification.

4.Power Mac G4 (QuickSilver/QuickSilver 2002) (see Figure 3):

Connect the black lead of the volt meter to pin 11 of the 22- pin power supply connector. Connect the red lead of the volt meter to pin 22 of the power supply connector. The volt meter should measure approximately +25V.

If you do not get a reading of +25V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.

If you do measure +25V on pin 22, the power supply is likely OK. Go to the next step for further verification.

5.Start up the computer by pressing the power button on the front of the computer. Note: Verify that the power cable is plugged into connector J30.

If the computer starts up normally, the power supply is OK. If the computer does not start up normally, go to the next step.

6.Check to see if the power supply fan is spinning. If it is not, replace the power supply. If it is spinning, go to the next step.

7.Connect the black lead of the volt meter to pin 16 of the power supply connector for AGP and PCI models or pin 11 for Gigabit Ethernet/Digital Audio/QuickSilver/QuickSilver 2002 mod- els. Connect the red lead of the volt meter to pin 1 of the power supply connector. The volt meter should measure approxi- mately +3.3V.

If you do not get a reading of +3.3V, re-check the volt meter connections and measure the voltage again. If voltage is still

not present, replace the power supply; otherwise, go to the next step.

8.Connect the black lead of the volt meter to pin 16 of the power supply connector for AGP and PCI models or pin 11 for Gigabit Ethernet/DIgital Audio/QuickSilver/QuickSilver 2002 mod- els. Connect the red lead of the volt meter to pin 4 of the power supply connector. The volt meter should measure approxi- mately +5V.

If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.

9.Measure the voltage of pin 10 on the power supply connector. The voltage should measure approximately +12V.

If you do not get a reading of +12V, re-check the volt meter

connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.

10. The testing is complete. You have just verified that the power supply is not the cause of the ???No apparent power??? symptom.

Power Mac G4 (all models except PCI Graphics)

Four slots on the Power Mac G4 (AGP Graphics/Gigabit Ethernet) logic boards accept 64, 128, 256, or 512 MB DIMMs. Three slots on the Power Mac G4 (Digital Audio/QuickSilver/QuickSilver 2002) board accept 64, 128, 256, or 512 MB DIMMs. Any 256 MB DIMMs must be 128 or 256 Mbit technology; 512 MB DIMMs must be 256 Mbit technology.

Power Macintosh G4 (PCI Graphics)

Four slots on the Power Macintosh G4 (PCI Graphics) logic board accept 8, 16, 32, 64, 128, and 256 MB DIMMs. Any 128 MB DIMMs must be 64 or 128 Mbit technology; 256 MB DIMMs must be 128 Mbit technology.

PCI Cards

Video Card Installation

Power Mac G4 computers require an I/O video card that moves video from the main logic board. The card is installed in slot #1 on the logic board, as illustrated below. Slot #1 on the Power Macintosh G4 (PCI Graphics) is a PCI slot; slot #1 on the other models of Power Mac G4 is an AGP slot. Refer to the Symptom Charts for details on troubleshooting video cards.

Power Mac G4 (PCI Graphics/AGP Graphics/Gigabit Ethernet)

Cleaning Procedure for Card Connectors

It is possible for residue to build up on the gold edge connector pins on some cards, which could cause a variety of symptoms.

If you are having problems with a card, inspect the connector pins with a magnifying glass. If you find residue, use a pencil eraser or the chemical cleaner ???stabilant??? (see TIL article 10468) to gently clean the pins. Remember, never handle the cards by the gold connectors.

VGA-to-Macintosh Adapters

To avoid ???No video??? or ???Black screen??? situations, do not use two VGA-to-Macintosh adapters (one on each end) on the video cable that connects a Power Mac G4 computer to a monitor with a captive VGA connector.

If you need to connect a VGA monitor, connect it in one of the following ways:

???VGA monitor --> to a VGA cable with VGA connectors on both ends --> to the video card on the Power Mac G4

???VGA monitor --> to a mixed cable, a cable that has a VGA connector on one end and a Macintosh connector on the other end --> to the video card on the Power Mac G4

Cable Select Drives in QuickSilver 2002ED

The education-only version of the Power Mac G4 (QuickSilver 2002ED) works with ATA and ATAPI internal storage devices that are set for cable select mode. The cable select feature forces the device to set its ID as either master or slave based upon its position on the ATA/ATAPI cable. If the device is attached to the end of the cable, then the device identifies itself as a master. If the device is at the middle cable position, then it is a slave. Because cable select mode forces the drive to set its ID based upon its position on the cable, hard drives and optical drives are easily configured. Before you install an additional third-party ATA and ATAPI drive, check the documentation that came with the drive or with the manufacturer to make sure it is set for cable select mode.

Important: Use the original Apple cables that came with this computer when you install additional drives. Some non-Apple cables may not correctly support cable select mode.

Symptom Charts

How to Use the Symptom Charts

The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.

In addition, refer to the Diagnostics page of Service Source at Service Source Online (http://service.info.apple.com) for information on diagnostic tools that can help you isolate hardware problems.

For other assistance, contact Apple Technical Support.

2Refer to the adjustments section of the service manual or owner???s manual for the monitor. Adjust monitor as necessary.

3Third-party monitors: Try a known-good monitor.

4Reseat the video cable.

5Reseat the video card.

6Check the video adapter, if present. Refer to ???VGA-to- Macintosh Adapter??? earlier in this chapter.

7Replace the video card.

2Check all cable connections.

3Make sure that the video card driver and firmware are updated to the most recent versions.

4Test with a known-good monitor. Replace the monitor, if necessary. Refer to the appropriate monitor manual to troubleshoot a defective monitor.

5Reseat the video card.

6Replace the video card.

7Replace the logic board.

TroubleshootingSymptom Charts/ Zip Drive - 57

Zip Drive

2Switch the printer to a different USB port. If the printer operates correctly, the first port was bad. Replace the logic board. Note: You can also use Apple System Profiler to verify USB ports.

3Verify the correct versions of the system software and printer driver are installed.

4Mac OS X: Use Print Center to verify that you have the

correct printer selected. Mac OS 9: Use Chooser to verify that you have the correct printer selected.

5If the printer is connected to a third-party USB hub, switch it to one of the USB ports on the I/O panel. If the printer operates, the hub is bad.

6Mac OS 9: Turn off unnecessary extensions.

7De-install and then re-install the print driver.

8Replace the printer interface cable.

9Replace the printer.

10Replace the logic board.

TroubleshootingSymptom Charts/ Modem - 64

Modem

Installation

Procedures

SDRAM DIMM

Before you begin, open the side access panel.

DIMM Slots

running Mac OS 9, you must press Option-S when restarting the computer. This ensures the customer will see the Setup Assistant (a movie and setup instruc- tions). If these keys are not pressed down each time a technician restarts the sys- tem after an upgrade, the Setup Assistant file will ex- ecute, disable itself, and the customer will never see it.

UpgradesAirPort Card - 4

Clip

will see the Setup Assistant (a movie and setup instruc- tions). If these keys are not pressed down each time a technician restarts the sys- tem after an upgrade, the Setup Assistant file will ex- ecute, disable itself, and the customer will never see it.

Power Mac G4 (AGP Graphics)

Support Plate 922-3871

Power Mac G4 (Gigabit Ethernet)

USB Pro Mouse (optical) 922-4230

Power Mac G4 (Digital Audio)

(1) Modem, (1) Modem plug, (2) Carrier support plate, (1) Power supply bracket,

(4) Latch panel, (12) Logic board, (2) Firewire board, (2) Fan guard, (3) Chassis,

(1) Hard drive carrier retainer, (4) PCI slot covers (same screw can be used when cards installed)

USB Pro Mouse (optical) 922-4230

Power Mac G4 (QuickSilver)

Power Mac G4 (QuickSilver)??? Screw Matrix

USB Pro Mouse (optical) 922-4230

Power Mac G4 (QuickSilver 2002)??? Screw Matrix

USB Pro Mouse (optical) 922-4230