Apple powermac g3 Service Manual

K

Service Source

Power Macintosh G3

All-In-One

K

Service Source

Basics

Power Macintosh G3

All-In-One

Basics Overview - 1

Overview

Introducing the Power
Macintosh G3 All-In-One
design.

• The new all-in-one is
designed for education and
fulfills all the computing
needs of teachers and
students.

• Powerful and easy-to-use
video editing and multimedia
authoring features at an
affordable price.

Click the icon at left for a
QuickTime VR movie of the
Power Mac G3 All-In-One.

Basics Overview - 2

Features of the Power Macintosh G3 All-In-One include

• PowerPC G3 microprocessor running at 233 MHz or
266 MHz

• RAM expandable to 384 MB in 3 DIMM slots using 64­bit wide, 168-pin JEDEC-standard 3.3 V unbuffered
SDRAM DIMMs

• 512K of static RAM used as L2 cache on processor module

• Built-in 2D and 3D hardware graphics acceleration

• PERCH slot to support I/O card

• One modem slot on the I/O card for optional fax/modem
card

• 4 GB or 6 GB ATA hard drive

• 100 MB SCSI Iomega Zip drive

• CD-ROM ATAPI drive at 24X speed

• 1.4 MB SuperDrive

• One SCSI port

• Two GeoPort serial ports

• 10BASE-T Ethernet port

Basics Overview - 3

• One ADB port

• Three PCI expansion slots to accept

• three 7-inch PCI cards, or

• three 15 W cards, or

• two 25 W cards, or

• one 15 W card and one 25 W card

• Fan speed thermally controlled

• Energy Saver control panel

• 2 MB video RAM expandable to 6 MB with

3.3 V, 100 MHz or faster SGRAM on a 144-pin small
outline dual inline memory module (SO-DIMM)

Basics Overview - 4

Optional Build-to-Order Power Mac All-In-One Features:

• 100 MB SCSI Iomega Zip drive in the expansion bay

• 6 GB hard drive

• 64 MB (using one 64 MB DIMM) or 96 MB (using 1x
32 MB and 1x64 MB DIMM) of memory

• I/O, Audio/Video card

• 10/100 BaseT ethernet card

Basics The Cuda Chip - 5

The Cuda Chip

The Cuda is a microcontroller chip. Its function is to

• Turn system power on and off

• Manage system resets from various commands

• Maintain parameter RAM (PRAM)

• Manage the Apple Desktop Bus (ADB)

• Manage the real-time clock

Many system problems can be resolved by resetting the Cuda
chip (see Symptom Charts for examples). Press the Cuda
reset button on the logic board to reset the Cuda chip. (See
“Logic Board Diagram” later in this chapter to locate the
Cuda reset button.) If you continue to experience system
problems, refer to “Resetting the Logic Board” in this
Basics chapter.

Basics Resetting the Logic Board - 6

Resetting the Logic Board

Resetting the logic board can resolve many system problems
(refer to “Symptom Charts” for examples). Whenever you
have a unit that fails to power up, you should follow this
procedure before replacing any modules.

1 Unplug the computer.

2 Remove the battery from the logic board.

3 Disconnect the power supply cable from the logic board

and then press the Cuda Reset button. (See “Logic
Board Diagram” later in this chapter to locate the Cuda
Reset button.)

4 Wait at least 10 minutes before replacing the battery.

5 Make sure the battery is installed in the correct +/-

direction.

Basics Resetting the Logic Board - 7

6 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.

Basics Sound - 8

Sound

The sound system for the Power Macintosh G3 computers is
implemented entirely on the I/O card. Each supports 16-bit
stereo sound output and input, available simultaneously.

The sound circuitry on the I/O card and system software can
create sounds digitally and either play the sounds through
speakers inside the enclosure or send the sound signals out
through the sound output jacks. The sound circuitry digitizes
and records sound as 16-bit samples. The computer can use

22.050K or 44.100K samples per second. The sound system
plays samples at the sampling rate specified in the Monitors
& Sound control panel.

Basics Sound - 9

The Power Macintosh G3 also records sound from several
sources:

• A microphone connected to the line-level sound input

jack

• A compact disc in the CD-ROM player

• Analog sound from the cross-platform card in a PCI slot

• Analog sound from optional communication cards

• Internal Microphone

With each sound input source, sound playthrough can be
enabled or disabled.

Basics Sound - 10

Sound Output

All sound output features for the Power Macintosh G3
computer are provided by the I/O card. The I/O card
provides one mini jack for sound output on the back of the
enclosure.

The output jacks are connected to the sound amplifier. The
mini jack is intended for connecting a pair of headphones or
amplified external speakers. There are two speakers and two
headphone jacks on the front of the system. Inserting a plug
into the sound output mini jack disconnects the internal
speaker.

Basics Sound - 11

Sound Input

The I/O card provides a stereo sound input jack on the back
of the enclosure for connecting an external Apple PlainTalk
line-level microphone or other sound source pair of line­level signals. The sound input jack accepts a standard 1/8­inch stereophonic phone plug (two signals plus ground).

Note:

The microphone for the Macintosh LC and LC II does
not work with the I/O cards.

Options in the Monitors & Sound control panel determine the
interaction between the sound input and output devices. The
sound circuitry normally operates in one of three modes:

• Sound playback—computer-generated sound is sent to the

speaker and the sound output jacks.

• Sound playback with playthrough—computer sound and

sound input are mixed and sent to the speakers and sound
output jacks.

Basics Sound - 12

• Sound record with playthrough—input sound is recorded

and also sent to the speakers and sound output jacks.

Basics PowerPC G3 and Backside Cache - 13

PowerPC G3 and Backside Cache

Backside cache is a significant architectural design change
from earlier PowerPC processors. The main advantage of the
backside cache architecture is the speed of the dedicated
CPU-to-L2 cache interface. Using the dedicated bus allows
the CPU to access the fast L2 cache storage through a high
speed bus without addressing the slower system bus or
competing with other devices attached to the system bus. In
comparison, a “far-side” cache running on the system bus
would limit that SRAM interface to 50MHz.

The PowerPC G3 microprocessor interfaces with SRAM
storage via a dedicated bus running at various multiples of
the core PLL CPU speed. With high speed L2 SRAM and a
dedicated L2 bus, the CPU can access stored information up
to the speed of the processor clock. L2 access is determined
by the clock ratio setting. For example, with a 250MHz

Basics SDRAM DIMMs - 14

PowerPC G3, and a 2.5 L2 bus ratio, the backside cache bus
speed will be 100MHz, twice the speed of the system bus.

SDRAM DIMMs

Three DRAM expansion slots on the logic board accept 3.3 V
SDRAM unbuffered 8-byte DIMMs. The 168-pin DIMM has a
64-bit-wide data bus per bank. The minimum bank size
supported on the Power Macintosh G3 all-in-one model is 4
MB, and the largest is 64 MB. The largest DIMM supported
is a two-bank DIMM of 64 MB using 32 Mbit SDRAM
devices.

The Power Macintosh G3 All-In-One logic board supports a
maximum DRAM expansion of 384 MB. Fill all three slots
with 128 MB DIMMs.

Basics SDRAM DIMMs - 15

The DRAM DIMMs can be installed one or more at a time. The
logic board supports only linear memory organization.
Therefore, no performance gains are seen when two DIMMs
of the same size are installed. Any supported size DIMM can
be installed in any DIMM slot, and the combined memory of
all the DIMMs installed will be configured as a contiguous
array of memory.

Important:

DIMMs. DIMMs from older Macintosh computers are not
compatible and should not be used even though they fit into
the DRAM DIMM slots.

Power Macintosh G3 computers use SDRAM

Basics SGRAM Video Memory - 16

SGRAM Video Memory

The Power Macintosh G3 logic board comes with 2 MB of
Synchronous Graphic RAM (SGRAM) video memory soldered
on. The logic board also contains a video memory expansion
slot that accepts a Small Outline DIMM (SO-DIMM) to
increase video memory up to a maximum of 6 MB. Apple
supports a 4 MB SGRAM SO-DIMM that is 32-bit wide,
144-pin, fast-paged, 100 MHz/10 ns cycle time or faster.

Important:

or 512K video memory DIMMs used in older Macintosh
computers.

Use only SGRAM SO-DIMMs. Never use the 256K

Basics DIMM Slots - 17

DIMM Slots

DRAM
DIMM
Slots

Video Memory Expansion Slot

SGRAM SO-DIMM

ROM Slot
(Do not remove
the ROM DIMM.)

Basics - 18

Peripheral Component Interconnect
(PCI)

The Peripheral component Interconnect (PCI) expansion
slots accept 7-inch PCI cards. Install only expansion cards
that come with Macintosh drivers and are compliant with the
PCI 2.1 standard. Nubus™ cards cannot be used in these
expansion slots.

PCI offers significantly higher performance than the NuBus
architecture used in previous Macintosh models. Running at
33 MHz, the PCI bus is up to three times faster than NuBus,
offering overall enhanced system performance, particularly
in the areas of video and networking.

Basics Internal Locator - 19

Internal Locator

Video Board

Analog Board

Zip Drive

Logic Board

CD-ROM Drive

Hard Drive

Power Supply

Floppy Drive

Basics Rear View - 20

Rear View

SCSI

Port

Apple

Desktop

Bus

(ADB)

Port

Sound Output Port

Ethernet

(10Base-T)

Port

Printer

External

modem

Port

&

Monitor

Port

Sound Input Port

Card

Port

Access
Covers for
Expansion
Slots (3)

Internal
Modem

See next page for
optional AV card.

Basics Optional AV Card - 21

Optional AV Card

Audio output ports

(right & left)

Composite Video Ports

(OUT and IN)

Sound Output Port

Audio Input Ports
(right & left)

S-Video Ports
(OUT and IN)

Sound Input Port

Optional AV ports

Basics Logic Board - 22

Logic Board

Power Supply
Jumper Block

Cuda Reset Button

PERCH

Slot

Ethernet

Port

Monitor

Port

Serial

Ports

ADB
Port

SCSI

Port

Internal SCSI
Connector

IDE Connector

PCI

Slots

Video Memory

SO DIMM

Voltage Regulator

Processor Jumper Block

Battery

LED

Speaker

Power

On/Off

CD

Audio

ROM

DIMM

DRAM
DIMM

Power Supply
Connector

Floppy Drive
Connector

Microprocessor

Basics Repair Strategy - 23

Repair Strategy

Service the Power Macintosh G3 computers through module
exchange and parts replacement. Customers can request on­site service from an Apple Authorized Service Provider Plus
(AASP+), Apple Assurance (US only), or Apple Canada
Technical Answerline (Cananda only). They can also choose
carry-in service from an AASP.

Ordering

Apple 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 (US only) or ARIS (Canada only)
system and refer to the Power Macintosh G3 “Service Price
Pages.”

Basics Repair Strategy - 24

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

USA Ordering

US 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
Austin, TX 78714-9125

For US inquiries, please call Service Provider Support at
800-919-2775 and select option #1.

Basics Repair Strategy - 25

Canadian Ordering

Canadian Service providers not enrolled in ARIS may fax
their orders to Service Provider Support in Canada (1­800-903-5284). For Canadian inquiries, please call
Service Provider Support at 905-513-5782 and select
option #3.

Basics Warranty/AppleCare/ARIS - 26

Warranty/AppleCare/ARIS

US Only

The Power Macintosh G3 computers are covered under the
Apple One-Year Limited Warranty. The AppleCare Service
Plan is also available for these products. Service Providers
are reimbursed for warranty and AppleCare repairs made to
these computers. For pricing information, refer to “Service
Price Pages.”

Canada Only

The Power Macintosh G3 computers are covered under
AppleCare. The Extended AppleCare Service Plan is also
available for these products. Service Providers are
reimbursed for warranty and AppleCare repairs made to
these computers. For pricing information, refer to “Service
Price Pages.”

K

Service Source

Specifications

Power Macintosh G3 All-in-One

Specifications Introduction - 1

Introduction

Specifications information for this product can be found in the Spec Database, which you
can access at Service Source Online (http://service.info.apple.com) or on Service Source
CD.

Spec Database at Service Source Online

From the Service Source Online home page, click Troubleshoot and Repair to access the
main repair procedures page. Then click either Apple Spec in the navigation table in the
upper right corner of the page, or click Apple Spec Database from the list of reference tools
below.

Spec Database on Service Source CD

Open the CD and double-click the Apple Spec Database alias located at the top level of the CD.

K

Service Source

T ak e Apart

Power Macintosh G3

All-In-One

Take Apart Chassis Carrier - 1

Chassis Carrier

No preliminary steps are
required before you begin
this procedure.

1 Loosen the four screws.

2 Pull the chassis carrier

half way out of the unit.

Take Apart Chassis Carrier - 2

3 Disconnect the front

control panel cable, RGB
cable, main power cable,
and HDA power cable.

Take Apart Chassis Carrier - 3

4 Press up on the tabs to

release the chassis
carrier.

5 Pull chassis carrier out

of unit.

Note

: See graphic on next
page showing complete
chassis carrier out of the
unit.

Take Apart Chassis Carrier - 4

Note:

Graphic illustrates
modules and support
bracket located in
chassis carrier.

Take Apart Hard Drive - 5

Hard Drive

Before you begin, remove
the chassis carrier.

Take Apart Hard Drive - 6

1 Disconnect the hard

drive data cable and the
power cable from the
back of the hard drive.

Take Apart Hard Drive - 7

2 Pull up the release latch

and slide the hard drive
forward to remove it
from the internal
chassis.

Note:

Be sure to remove
the hard drive from its
carrier before
returning the drive to
Apple.

Take Apart Floppy Drive - 8

Floppy Drive

Before you begin, remove
the chassis carrier.

Take Apart Floppy Drive - 9

1 Pull up the release

latch, and slide the
floppy drive forward
enough to reach the
floppy cable.

2 Disconnect the cable

from the back of the
floppy drive.

3 Remove the floppy drive

from the unit.

Note:

Be sure to remove
the EMI shield and floppy
drive carrier before
returning the drive to
Apple.

Take Apart Zip Drive - 10

Zip Drive

Before you begin, remove
the chassis carrier.

Take Apart Zip Drive - 11

1 Pull up the release

latch, and slide the Zip
drive forward enough to
reach the cables.

2 Disconnect the SCSI and

Zip power cables from
the back of the Zip drive.

3 Remove the Zip drive

from the unit.

Note:

Be sure to remove
the EMI shield and Zip
drive carrier before
returning the drive to
Apple.

Take Apart Adding a Zip Drive - 12

Adding a Zip Drive

There may be requests to add a zip drive
to a Power Mac G3 All-in-one
computer. Some prebuilt and build-to­order configurations do not include a
zip drive. Therefore, customers may
want to upgrade their systems by
installing a zip drive taken from
another computer, or by purchasing the
individual service parts.

See the Additional Procedures section
for instructions.

Take Apart CD-ROM - 13

CD-ROM

Before you begin, remove
the chassis carrier.

08

Take Apart CD-ROM - 14

1 Position the chassis

carrier on its side.

2 Disconnect the CD-ROM

power cable, CD-ROM
SCSI cable, and CD-ROM
audio cable from the
back of the CD-ROM
drive.

Take Apart CD-ROM - 15

3 Pull down on the plastic

frame while squeezing
the latch. Slide the CD­ROM drive forward to
remove it from the unit.

Note:

Be sure to remove
the EMI shield and CD­ROM carrier before
returning the drive to
Apple.

Take Apart CD-ROM - 16

Replacement Note:

removed the CD-ROM cables
from the chassis you will
need to reposition them
before connecting the CD­ROM drive.

1 Tuck the CD-ROM power

cable, the CD-ROM SCSI
cable, and the CD-ROM
audio cable through the
hole in the plastic
chassis.

2 Reconnect the cables to

the CD-ROM drive.

3 Push CD-ROM into the

chassis until it clicks
into position.

If you

Take Apart I/O Card - 17

I/O Card

Before you begin, remove
the chassis carrier.

Take Apart I/O Card - 18

1 Disconnect cables on the

I/O Card.

2 Remove two screws that

secure card to chassis.

Note:

Be careful of the
voltage regulator when
removing or replacing
the I/O card.

Take Apart I/O Card - 19

3 Remove external I/O

screw on chassis.

Take Apart I/O Card - 20

4 Gently rock the I/O card

out of the socket.

5 Remove card from logic

board.

Replacement Note:

back end (end nearest
voltage regulator) of I/O
card and push card down into
slot. Be careful not to
damage the voltage
regulator or modem.

Line up

Take Apart Cable Support Bracket - 21

Cable Support Bracket

Before you begin remove
the chassis carrier.

Take Apart Cable Support Bracket - 22

1 Disconnect the SCSI

cable and the two IDE
cables on the logic board.

Take Apart Cable Support Bracket - 23

2 Remove screw on cable

support bracket.

3 Open white plastic cable

retainer and remove
gray cables from the
support bracket.

4 Lift the metal support

bracket out of unit.

Take Apart Logic Board - 24

Logic Board

Before you begin do the
following:

• Remove the chassis
carrier

• Remove I/O card

• Disconnect the SCSI and
IDE cables

• Remove cable clamp
support bracket

Caution

precautions in Bulletins/
Safety.

: Review the ESD

Take Apart Logic Board - 25

1 Disconnect the floppy

drive cable.

2 Pull the Zip drive out a

bit to disconnect the Zip
drive power cable.

3 Disconnect the CD-Audio

cable (located next to
battery).

Take Apart Logic Board - 26

4 Remove the two silver

screws.

Note

: Do not remove
ground wire from the
heatsink.

Take Apart Logic Board - 27

5 Gently lift the logic

board out of the chassis
carrier.

Replacement Note:

logic board requires that
jumper J28 be set properly
for the unit to function. The
power supply jumper, which
installs at J28, should cover
the pins marked "Mac" when
a new board is installed.

This

Take Apart CRT EMI Shield - 28

CRT EMI Shield

±

12

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Before you begin, do the
following:

• Remove the chassis
carrier

• Remove the top, side, and
rear panel housing

This product

Take Apart CRT EMI Shield - 29

1 Remove the six screws

on the EMI Shield.

Note

: The EMI shield has
sharp edges. Be careful
not to cut yourself.

Take Apart CRT EMI Shield - 30

2 Lift the shield up,

releasing the shield from
the metal tabs on the
chassis.

3 Remove the shield from

the unit.

Replacement Note

sure the microphone cable is
pulled through the CRT
chassis frame so the EMI
shield doesn’t pinch the
microphone cable.

: Make

Take Apart Power Supply - 31

Power Supply

Before you begin do the
following:

• Remove the chassis
carrier

• Remove the top, side, and
rear panel housing

• Remove the CRT EMI
shield

• Discharge the CRT

Take Apart Power Supply - 32

1 Push tab in.

2 Lift and pull the power

supply up to clear the
pegs from the chassis
holes.

Note

: The cables are still
attached to the power
supply at this point.

Take Apart Power Supply - 33

3 Disconnect the multi-

colored power cable
(P904),the ground wire
(P911), and the 2-pin
brown wire (TH901),
from the power supply.

Take Apart Power Supply - 34

4 Tilting the power

supply off to the side,
disconnect the remaining
cables on the power
supply board:

• P912

• P905

• P906

• P913

• P908

Note

: P906 and P908
have locking connectors.
Pinch or squeeze to
release the connectors.

5 Remove power supply

from the chassis.

Take Apart Power Supply - 35

Replacement Note

connectors are impossible to
reconnect when the board is
in place. Before inserting
the power supply, connect
cables TH901, P908,
P913, P906, and P905.
Also, make sure the pegs on
the power supply reseat into
the holes in the chassis.

: Some

Take Apart Power Supply - 36

Additional cable descriptions:

P912

: Thermistor cable: a 2-wire gray & brown cable that

connects to the brown connector on the power supply board

P905

: Fan cable: a 2-wire red &black cable

P906

: a flat gray ribbon cable (922-3492). This cable is a
wide gray ribbon cable that connects to the I/O card and then
splits off into three cables, one goes to the front panel board,
one to the power supply board (P906), and one to the analog
board (P503).

P913

: a 10-wire gray & blue cable (2 wires from this cable
split off and connect to P4 on the front panel board and the
other end connects to P505 on the analog board)

P908

: a 5-wire gray & blue cable (P908 connects to P507
on the analog board)

Take Apart Analog/Video Board - 37

Analog/Video Board

Before you begin do the
following:

• Remove the chassis
carrier

• Remove the top, side, and
rear housing

• Remove the CRT EMI
shield

• Discharge the CRT

• Disconnect anode cap

Take Apart Analog/Video Board - 38

1 Disconnect the

microphone (P703),
ground wire (P702),
degaussing wire
(P508), and the yoke
wire (P701).

Take Apart Analog/Video Board - 39

2 Gently remove the CRT

video board.

3 Push in tab and lift

analog board out of
chassis holes.

Take Apart Analog/Video Board - 40

4 Disconnect P502,

P503, P507, P506, and
P505.

Important

P503, P507, and P506
have clamped (or
locking) connectors.
Pinch or squeeze to
release these connectors.

5 Remove analog/CRT

video board from
chassis.

Note

: See next page for cable

connection information.

: P502,

Take Apart Analog/Video Board - 41

On the analog board:

• P502 connects to P305 on the CRT video board

• P503 connects to P906 on power supply

• P505 connects to P913 on the power supply

• P507 connects to P908 on the power supply

• P506 connects to P302 on the CRT video board

Take Apart CRT Bezel - 42

CRT Bezel

Before you begin, remove
the following:

• Top, side, and rear panel
housing.

• Front door

Take Apart CRT Bezel - 43

1 Remove the two silver

torx screws located on
each side of the CRT.

2 Disconnect the

microphone cable (P11)
from the microphone
board.

3 Pull bezel off the

chassis.

Take Apart Speakers - 44

Speakers

Before you begin do the
following:

• Remove the top, side, and
rear panel housing

• Front door

• CRT Bezel

• Front panel board

Take Apart Speakers - 45

1 Remove speaker screw.

2 Speaker cable should be

disconnected from sound
board; gently pull
speaker cable out from
underneath the CRT.

3 Slide the speaker

forward to remove it
from the chassis.

4 Repeat steps 1-3 to

remove opposite
speaker.

Take Apart Front Panel Board - 46

Front Panel Board

Before you begin do the
following:

• Remove the top, side and
rear panel housing

• Front door

• CRT bezel

1 Remove two screws.

Take Apart Front Panel Board - 47

2 Pull front panel board

forward to disconnect
the three cables and
ribbon connector.

3 Remove front panel

board from chassis.

Take Apart CRT - 48

CRT

±

Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Before you begin do the
following:

• Remove the chassis
carrier

• Remove the top, side, and
rear panel housing

• Remove the CRT EMI
shield

• Discharge the CRT

Take Apart CRT - 49

• Remove the analog board

• Remove the power supply

• Remove the front door

• Remove the CRT bezel

• Remove front panel board

Take Apart CRT - 50

1 Remove the screws that

secure the clips.

2 Remove clips.

Take Apart CRT - 51

3 Remove two screws that

secure the CRT frame to
the main chassis.

Take Apart CRT - 52

4 Securely hold CRT and

lift CRT off the chassis.

Take Apart CRT - 53

Replacement Note: Position
bottom of CRT so the CRT
frame connects with the four
chassis catches under the
front of the CRT.

Continue lowering the CRT
frame onto the main
chassis. Squeeze the rear of
the CRT chassis frame
inward so it fits inside
chassis catches on either
side.

Attach screw (one on other
side also) where black
arrow is pointing.

Take Apart Fan - 54

Fan

Before you begin, do the
following:

• Remove the chassis
carrier.

• Remove the top, side, and
rear panel housing.

• Remove the CRT EMI
shield

• Discharge the CRT

• Remove the analog board

• Remove the power supply

Take Apart Fan - 55

1 Position hand inside

chassis to catch fan as it
drops down when the
two fan screws are
removed.

2 Remove fan from

chassis.

Take Apart Thermistor - 56

Thermistor

Before you begin, do the
following:

• Remove the chassis
carrier.

• Remove the top, side, and
rear panel housing.

• Remove the CRT EMI
shield

• Discharge the CRT

• Remove the analog board

• Remove the power supply

Take Apart Thermistor - 57

1 Remove screw on

thermistor bracket.

2 Remove bracket;

remove thermistor.

Take Apart Chassis w/ Cables - 58

Chassis w/ Cables

Before you begin do the
following:

• Remove the chassis
carrier

• Remove the top, side, and
rear housing

• Remove the CRT EMI
shield

• Discharge the CRT

• Remove the analog board

• Remove the power supply

• Remove the CRT bezel

• Remove the front door

• Remove the CRT

• Remove fan and
thermistor

Take Apart Chassis w/ Cables - 59

• Remove Tilt /Swivel Base

The chassis and three cables
remain. The chassis with
cables is part number 922-

3489.

Note: These cables are
available separately:

– Main power cable

(922-3481)

– RGB cable (922-

3480)

– Cable to I/O, front

panel, analog, p/s
(922-3492)

Take Apart Processor Module - 60

Processor Module

Before you begin, do the
following:

• Remove the chassis
carrier

• Remove I/O card

• Remove cable clamp
support bracket

Caution: Review the ESD
precautions in Bulletins/
Safety.

Take Apart Processor Module - 61

1 Remove the screw that

holds the processor
module wire to the logic
board.

Replacement Note: The
processor module wire
attaches to the top of the
logic board (not
underneath). When
screwing down the wire, be
careful not to damage the
capacitor that is next to the
screw hole. Use a manual
screw driver to avoid
damaging the capacitor.

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Warning: the heat sink may
be hot to the touch.

2 While pressing down on

the top of the clip that
secures the heatsink, use
a small flatblade
screwdriver to lift up on
the front tab of the clip
to release it.

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3 Lift up the clip and

remove it from the
heatsink.

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4 Lift up the heatsink to

remove it from the
processor module.

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5 Lift the metal lever at

the left of the processor
module.

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6 Pick up the processor

module by the edges and
gently lift straight up to
remove it. Be careful not
to bend the pins
underneath the module.

IMPORTANT: If you are only
replacing the processor
module, stop here. If,
however, you are removing
the processor module in
order to replace the logic
board, continue on to the
next page.

Replacement Note: Don’t
force the processor module.

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7 Remove the warranty

sticker and red jumper
block located next to the
battery if replacing the
logic board only.

IMPORTANT: When
replacing the processor
module, you must change the
processor jumper block and
warranty sticker to be
compatible with the proces­sor module you are install­ing. Failure to install the
jumper block properly will
result in a unit that does not
power on. See the instruc­tions on the following page.

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8 Install the jumper as

shown. Depending on the
computer’s processor
speed, you will install a
red jumper (233 MHz)
or a white jumper (266

Processor

Jumper Block

MHz). Be sure to cover
the pins as shown and to
install the jumper block
with the gold connector
pins facing down towards
the board.

233 MHz

Red

266 MHz

White

Battery

Replacement Note:

Position the processor
module over the slot, seat it
evenly, and press down
gently on the module to

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install it. Never force the
module or you may damage
the gold connector pins on
the underside. Flip down the
metal lever that secures the
module to the board.

Install a gap filler, 922­3643, on a new processor.

Replace the heatsink, insert
the clip onto the tab at the
rear of the module, swing
the clip over the heatsink,
and secure the front latch.