Apple iMac (Summer 2001) 01 Service Manual

K

Service Source

iMac (Summer 2001)

Note

: The procedures for this product are almost identical to
the iMac (Early 2001) computer. To differentiate the two
models, refer to the individual Service Source chapters, the
Knowledge Base, or the Technical Information Library.

© 2001 Apple Computer, Inc. All rights reserved.

K

Service Source

T ak e Apart

iMac (Summer 2001)

Note: The parenthetical product description (Summer 2001) refers to

the summer of the Northern Hemisphere.

Take Apart - 1

What’s New

New Models

There are four models of the
iMac: the 500 MHz iMac in
Indigo (Education only), the
500 MHz in Indigo and
Snow, the 600 MHz iMac in
Graphite and Snow, and the
700 MHz iMac Special
Edition in Graphite and
Snow.

Note:

The 500 MHz
Education iMac uses logic
board 661-2447.

Take Apart - 2

Part Changes for iMac (Summer 2001)

• Logic boards:
– added 661-2548, 700 MHz board
– 661-2447, 500 MHz board is now used in

educational iMacs, previously it was an
international board only

• Hard drives:
– added 661-2521, 60 GB Hard Drive

• External plastics
– added 922-4609, Front Outer Bezel, Snow, Rev. 2

Take Apart - 3

The following take apart
procedures for the iMac
(Summer 2001) computers
are identical to take apart
procedures for iMac (Early

2001) and iMac (Summer

2000) computers.
The Indigo Mac (Summer

2000) was used for all the
pictures in this chapter.

Take Apart - 4

Tools

The following tools are
recommended for the take
apart procedures:

• phillips screwdriver
(No.1 and No.2)

• a stubby (short) phillips
screwdriver

• plastic flatblade
screwdriver to release
tabs on plastic housing

• jeweler’s screwdriver

• CRT discharge tool

• needlenose pliers

• ESD mat

Take Apart Bottom Housing With Flip Foot - 5

Procedures

Bottom Housing With Flip Foot

Before you begin, position
the computer face down,
resting the computer on an
ESD mat or other soft
surface.

Take Apart Bottom Housing With Flip Foot - 6

1. Using a plastic flatblade

screwdriver, remove
the VGA vented cover.

2. Remove the two screws

near the flip foot.

Take Apart Bottom Housing With Flip Foot - 7

3. Remove the video out

access door from the
bottom housing.

Take Apart Bottom Housing With Flip Foot - 8

4. Remove the two outer

screws located near the
video out port.

Replacement Note:

The
bottom housing uses two
sizes of screws. The two
shorter screws attach
near the flip foot.

Take Apart Bottom Housing With Flip Foot - 9

5. Pull the bottom housing
off the computer.

Take Apart Bottom Housing With Flip Foot - 10

Bottom Housing Replacement Note

1. Align the three tabs on
the bottom housing with
the tab slots on the front
outer bezel.

Ensure that the center
tab is properly aligned
or CDs and DVD discs
may not eject from the
slot.

2. Lower the bottom
housing into place and
replace the screws.

Take Apart EMI Cover - 1 1

EMI Cover

Before you begin:

• Position the computer

upside down, resting the
computer on an ESD mat
or other soft surface.

• Remove the bottom

housing.

Take Apart EMI Cover - 1 2

1. Remove the six screws
on the EMI cover.

Take Apart EMI Cover - 1 3

2. Lift the EMI cover off the
computer.

Be careful of the

Note:

VGA output port.

Take Apart EMI Cover - 1 4

Replacement Note:

Position
the rear of the EMI cover
into place first, positioning
the EMI cover over the video
port (if present). Continue
lowering the cover into
place by gently squeezing in
on both sides, as you lower
the cover into position.

Take Apart SDRAM DIMM - 1 5

SDRAM DIMM

Before you begin, position
the computer face down,
resting the CRT on an ESD
mat or other soft surface.

Take Apart SDRAM DIMM - 1 6

1. With a flatblade

screwdriver or coin,
turn the colored latch
counterclockwise on the
access door.

2. Pull the access door

down to open.

Take Apart SDRAM DIMM - 1 7

3. Push down on the plastic

tabs to release the
SDRAM module(s).

4. Carefully lift the SDRAM

from the slot.

Remove installed

Note:

SDRAM from the logic board
before returning the logic
board to Apple.

Take Apart AirPort Card - 18

AirPort Card

Before you begin, position
the computer face down,
resting the CRT on an ESD
mat or other soft surface.

If the AirPort Card is

Note:

not installed, a protective
antenna cap will be attached
to the antenna.

Take Apart AirPort Card - 19

1. With a flatblade

screwdriver or coin,
turn the colored latch to
open the access door.

The antenna and AirPort
Card will be visible
when you open the access
door.

If the AirPort card

Note:

is not installed, a clear
protective antenna cap
will be attached to the
antenna.

Take Apart AirPort Card - 20

2. Remove the AirPort Card

by lifting the card
straight up and out of the
card guides and
connector.

Take Apart AirPort Card - 21

3. Disconnect the antenna

from the small hole
AirPort Card.

Take Apart AirPort Card - 22

4. Remove the ground clip

from the AirPort
Adapter Card.

5. Using the pull tab,

separate the AirPort
Card from the adapter
card.

Take Apart CD/HD Carrier - 23

CD/HD Carrier

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

• SDRAM

Take Apart CD/HD Carrier - 24

1. Remove the four screws

connecting the CD/HD
drive carrier to the
metal chassis (also
known as the divider
panel).

Take Apart CD/HD Carrier - 25

2. Disconnect the following

cables fro the back of the
CD/HD carrier:

• hard drive power
cable

• hard drive data cable

• CD-ROM/DVD-ROM
data cable

• logic board cable
connector

Take Apart CD/HD Carrier - 26

3. Tilt the CD/HD carrier
forward and lift the
carrier out of the
computer.

Continue with the

Note:

Take Apart procedures if you
are replacing the CD-ROM,
DVD-ROM, or the hard
drive.

Take Apart CD-ROM / DVD-ROM/CD-RW - 27

CD-ROM / DVD­ROM/CD-RW

The procedures for

Note:

removing a CD-ROM, DVD­ROM and CD-RW are
identical. This procedure
will reference the CD-ROM
Take Apart.

Before you begin, position
the computer upside down,
and remove the following:

• bottom housing

• EMI cover

• SDRAM

• CD/HD carrier

Take Apart CD-ROM / DVD-ROM/CD-RW - 28

1. Using a Phillips
screwdriver, remove
the CD/HD carrier
mounting screws (two on
each side).

Take Apart CD-ROM / DVD-ROM/CD-RW - 29

2. Carefully turn the
CD/HD drive carrier
over.

3. Holding onto the CD-ROM
from the rear, lift the
CD-ROM carrier out of
the CD/HD carrier.

Important:

Don’t press
or squeeze the front of
the CD-ROM. Squeezing
the front could bend the
metal housing, making it
impossible to insert or
remove a CD or DVD disc.

Take Apart CD-ROM / DVD-ROM/CD-RW - 30

4. Using a jeweler’s
screwdriver, remove
the four screws (two on
each side) on the CD/
DVD carrier.

5. Lift the CD-ROM from
its carrier.

Take Apart CD-ROM / DVD-ROM/CD-RW - 31

6. On the back of the CD­ROM, Use a jeweler’s
screwdriver to remove
the two screws on the
adapter board.

7. Remove the adapter
board from the CD-ROM.

Return the drive

Note:

to Apple without the
cables, carrier, or the
adapter board. Refer to
the parts database for
more information.

Take Apart CD-ROM / DVD-ROM/CD-RW - 32

CD-ROM, DVD-ROM,CD­RW Module Replacement

Position the drive into its
carrier as shown.

1. Check that the yellow
warning label is face up.

if you are

Note:

installing a new drive
carrier, remove the blue
film covering the
grounding pad.

Take Apart CD-ROM / DVD-ROM/CD-RW - 33

2. Lower the CD/DVD
carrier into the CD/HD
carrier.

3. Push the CD/DVD
carrier forward so the
carrier tabs go through
the holes on the CD/HD
carrier.

4. Replace the CD/HD
carrier screws.

Take Apart CD-ROM / DVD-ROM/CD-RW - 34

5. Holding the drive
carrier in the
orientation shown, make
sure the CD-ROM or
DVD-ROM is correctly
installed into the CD/HD
carrier.

6. Make sure the Slave/
Master switch on the
back of the drive is still
set to the Slave mode
(set to the left).

Take Apart CD/DVD/CD-RW Adapter Board - 35

CD/DVD/CD-RW Adapter Board

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

• SDRAM

• CD/HD carrier

Take Apart CD/DVD/CD-RW Adapter Board - 36

1. Using a jeweler’s
screwdriver, remove
the two screws on the
CD/DVD adapter board.

2. Remove the adapter
board from the back of
the CD-ROM.

Return the CD/DVD-

Note:

ROM drive to Apple without
the cables, carrier, or the
adapter board. Refer to the
parts database for more
information.

Take Apart Hard Drive - 37

Hard Drive

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

• SDRAM

Take Apart Hard Drive - 38

1. Disconnect the following
cables on the back of the
hard drive:

• Hard drive power

cable

• Hard drive data cable

Take Apart Hard Drive - 39

The hard drive

Note:

carrier shown was
removed from the
computer. However, you
can easily remove the
hard drive while the
carrier is still screwed
down to the chassis.
Continue with the
procedure.

2. Using a #1 Phillips
screwdriver, remove
the four hard drive
mounting screws.

Take Apart Hard Drive - 40

3. Slide the hard drive out
of the CD/HD carrier.

Note:

Return the drives
without the cables or
carriers. Exchange Apple
hard drive modules like­for-like in Apple packaging.
Failure to comply with this
requirement may result in a
packaging noncompliance
charge. Refer to the parts
database for more
information.

Take Apart Hard Drive - 41

Hard Drive Replacement

When installing the hard
drive into the CD/HD
carrier, make sure the hard
drive is component side up
(as shown).

Take Apart Logic Board - 4 2

Logic Board

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover
The logic board and the down

converter board are
removed together (still
connected to each other), and
are separated once they are
removed from the computer.

Take Apart Logic Board - 4 3

Remove SDRAM to

Note:

make cable removal easier.

1. On the back of the CD/HD

carrier, disconnect the:

• hard drive power
cable

• hard drive data cable

• CD-ROM/DVD-ROM
data cable

• logic board cable
connector

2. Disconnect the antenna if
it’s connected to the
AirPort Card, or it it’s
attached to the protective
antenna cap.

Take Apart Logic Board - 4 4

3. Remove the six screws
on the logic board and
five screws on the down
converter board.

The two screws

Note:

located at the top of the
down converter board
(near the speaker) are
larger screws than the
other screws (with
washers).

Take Apart Logic Board - 4 5

4. Gently lift the down
converter board and
logic board out of the
computer.

Take Apart Logic Board - 4 6

5. Using a flatblade
screwdriver, pry the
plastic rivet off the
board.

Put the top half of the
rivet back into the
bottom half so it doesn’t
get lost.

Take Apart Logic Board - 4 7

6. Holding onto the down
converter, press down
on the black connector to
separate the down
converter board from
the logic board.

If you are returning

Note:

the logic board to Apple
refer to the parts database
and remove the SDRAM, any
cables, the modem, the
AirPort Card, and I/O panel.

Replacement Note:

When
reinstalling the logic board,
refer to the next page about
installing a thermal pad.

Take Apart Logic Board - 4 8

Thermal Pad Information

The following logic boards
use a thermal pad:

• 661-2425, 500 MHz

• 661-2426, 600 MHz

• 661-2458, 700 MHz
The thermal pad prevents

the microprocessor from

Back View

Thermal Pad

Front
View

overheating. It is crucial
that a new thermal pad be
used each time you detach
the logic board from the
divider panel assembly.
(Exception: if you are
testing the logic board and
detach it for a few minutes).

Take Apart Logic Board - 4 9

Thermal Pad Installation

1. Remove the old thermal

pad from the
microprocessor (or, it
may be stuck to the
divider panel).

2. Remove the protective

Thermal

Pad

backing from either side
of the new thermal pad
and place it on the
microprocessor.

3. Press down on the pad to

make sure it has even
contact without air
pockets.

4. Remove the protective

Take Apart Logic Board - 5 0

backing from the exposed
side of the thermal pad.

5. Install the logic board

back on to the divider
panel.

: Avoid unnecessary

Note

contact with either side of
the thermal pad as dirt or
body oils reduce the thermal
conductivity of the pad.

Thermal
Pad

Divider Panel

For additional information,
refer to Kbase article
58792, “Microprocessor
Thermal Pad Replacement”.

Take Apart Down Converter Board - 51

Down Con verter Board

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

Note:

The logic board and
the down converter board
are removed together (still
connected to each other), and
are separated once they are
removed from the computer.

Take Apart Down Converter Board - 52

Remove SDRAM to

Note:

make cable removal easier.

1. On the back of the CD/HD

carrier, disconnect the:

• hard drive power
cable

• hard drive data cable

• CD-ROM/DVD-ROM
data cable

• logic board cable
connector

2. Disconnect the antenna if
it’s connected to the
AirPort Card, or it it’s
attached to the protective
antenna cap.

Take Apart Down Converter Board - 53

3. Remove the six screws
on the logic board and
five screws on the down
converter board.

The two down

Note:

converter screws located
near the speaker are
larger screws than the
rest of the down
converter screws.

Take Apart Down Converter Board - 54

4. Lift the boards out of the
computer.

Take Apart Down Converter Board - 55

5. Using a flatblade
screwdriver, pry the
rivet off the logic board.

Put the top half of the
rivet back into the
bottom half so it doesn’t
get lost.

Take Apart Down Converter Board - 56

6. Holding onto the boards,
press down on the black
connector and separate
the down converter
board from the logic
board.

Replacement Note: When

reinstalling the logic
board, make sure the
antenna wire is not
underneath the board.

Take Apart Modem - 5 7

Modem

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

• logic board

Note: The modem is located

on the underside of the logic
board.

Take Apart Modem - 5 8

1. With the logic board
facing right side up,
disconnect the cable at
J12.

2. Remove the two screws
on the I/O panel.

Take Apart Modem - 5 9

3. Turn the logic board to
the underside and
remove the modem
screw.

Take Apart Modem - 6 0

4. Rotate the logic board
right side up again.
Carefully slide the I/O
panel off the logic board.

Note: As you slide the

I/O panel off the logic
board, support the
modem with your other
hand so the modem
doesn’t fall off the logic
board.

5. Remove the modem from
its connector slot on the
underside of the logic
board.

Take Apart Modem - 6 1

Modem Replacement

The I/O panel and the modem
are sandwiched between the
logic board and the metal
frame of the I/O panel. The
metal frame fits on top of the
logic board, over the screw
holes. On the underside of
the logic board, the screw
tab goes under the modem.

Replacement Note: After

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

Take Apart I/O Panel - 6 2

I/O Panel

Before you begin, position
the computer upside down,
resting the computer on an
ESD mat or other soft
surface and remove the
following:

• bottom housing

• EMI cover

• logic board

Take Apart I/O Panel - 6 3

1. Disconnect the cable at
J12, going from the
logic board to the I/O
panel.

2. Remove the two screws
on the I/O panel.

Take Apart I/O Panel - 6 4

3. Turn the logic board
over and remove the
modem screw.

Take Apart I/O Panel - 6 5

4. Rotate the logic board
face up again and
carefully slide the I/O
panel off the logic board.

Note: As you slide the

I/O panel off the logic
board, support the
modem with your hand so
the modem doesn’t fall
off the logic board.

Take Apart Front Outer Bezel - 66

Front Outer Bezel

Before you begin, place the
computer on an ESD mat and
remove the bottom housing.

Note: The Snow iMac has a

new part number for the
front outer bezel, 922-

4609.

Take Apart Front Outer Bezel - 67

1. With a jeweler’s
screwdriver, carefully
remove the two tabs on
the front outer bezel.
Refer to the next graphic
for a close-up of the tab
removal.

Take Apart Front Outer Bezel - 68

2. After removing the tabs,
remove the screws
located under the tabs.

Take Apart Front Outer Bezel - 69

Note: The bezel tabs fit

tightly into the rear
housing. A good, hard pull
upward is required to
release all the tabs.

3. Insert a plastic tool
underneath the bezel.

4. Pry the outer bezel tabs
from the rear housing
with a plastic tool. As
you push and pry the tool
inside the bezel, the side
tabs will start to
release.

5. Insert the tool on the left
side of the bezel and
repeat.

Take Apart Front Outer Bezel - 70

6. As the tabs start to
release, pull hard on the
front outer bezel to
release the tabs
completely.

Take Apart Top Rear Housing - 71

Top Rear Housing

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety. From the
Service Source Online home
page, click Troubleshoot and
Repair. Then click on Safety
under the Tools list.

Before you begin, rest the
computer on an ESD mat and
remove the following:

• bottom housing

• front outer bezel

Take Apart Top Rear Housing - 72

1. Remove the two tabs
(screw caps) on the top
inner bezel. Refer to the
next page for a close-up
of the tab removal.

Take Apart Top Rear Housing - 73

2. Pry the tabs off, and
remove the two screws
under each tab.

Take Apart Top Rear Housing - 74

3. Position the computer
face down.

4. Remove four screws and
loosen the fixed screw
(at the top) on the rear
housing.

Take Apart Top Rear Housing - 75

5. Position the computer
right side up. Push down
and pull out on the rear
housing to unhook the
rear housing tabs that
connect to the inner
bezel.

Take Apart Top Rear Housing - 76

6. Lift the top rear housing
off the computer.

Take Apart Divider Panel - 77

Divider Panel

Many service parts, such as
the speakers, power/
analog/video board, side
panels, cables, and the
headphone board, are
connected to the divider
panel. The divider panel is
the metal chassis with EMI
foam.

The divider panel is not
available as a service part
on the iMac (Early 2001)
computer.

Take Apart Divider Panel - 78

The thermal pad (A) and the
divider panel(B) are used on
the following logic boards:

• 661-2425, 500 MHz

• 661-2426, 600 MHz

• 661-2458, 700 MHz

Take Apart Power/Analog/Video Board - 7 9

Power/Analog/Video Board

Before you begin, discharge
the CRT, rest the computer
on an ESD mat or other soft
surface and remove the
following:

• bottom housing

• front outer bezel

• top rear housing

Note: There are two power/

analog/video boards, part
number 661-2465 (with a
switch at SW901) and 661-

2466. Exchange like-for-

like.

Take Apart Power/Analog/Video Board - 8 0

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
discharge the CRT.

1. Disconnect the
microphone connector
located near the top of
the CRT.

2. Unwrap the bendable
cable wraps in the upper
left and upper right
corners of the CRT.

3. Disconnect the anode cap.

Take Apart Power/Analog/Video Board - 8 1

4. Lift the degauss cable out
of the way to access the
side panel screws.

5. Using a narrow shaft
screwdriver, remove
the four side panel
screws (two on each
side) that attach the left
and right side panels to
the inner bezel.

Take Apart Power/Analog/Video Board - 8 2

6. Open the CRT cable
clamps. Remove the
wires from the cable
clamps.

Take Apart Power/Analog/Video Board - 8 3

7. Partially lift the side
panels (with the power/
analog/video board
attached to the divider
panel) up and off the
inner bezel to gain
access to connector
P501 located at the
bottom of the power/
analog/video board.

Take Apart Power/Analog/Video Board - 8 4

8. Disconnect P501 and
P701 on the power/
analog/video board. The
cables are located near
the high voltage
capacitor.

Take Apart Power/Analog/Video Board - 8 5

9. On the other side of the
CRT neck, disconnect the
brown degauss cable,
P901, from the power/
analog/video board.
Remove P901 from the
cable clamp.

Take Apart Power/Analog/Video Board - 8 6

10.At the very bottom of the
power/analog/video
board, near the bottom of
the CRT, disconnect
P902, which is part of
the audio/headphone/
LED/speaker cable
assembly.

Take Apart Power/Analog/Video Board - 8 7

1 1.Disconnect the two

ground cables on the
video board.

Important: Be careful when

working around the CRT
neck rings. If the neck rings
are bumped, the CRT will be
knocked out of adjustment,
and will require
replacement of the CRT.

Take Apart Power/Analog/Video Board - 8 8

12.Loosen the CRT neck
clamp screw.

Take Apart Power/Analog/Video Board - 8 9

13 .Carefully pull the video

board off the CRT neck.

Take Apart Power/Analog/Video Board - 9 0

14. Holding on to the side
panels, lift the power/
analog/video board
(which is attached to the
side panels and divider
panel) from the inner
bezel.

Take Apart Power/Analog/Video Board - 9 1

15. Remove the ten screws
and pinch the two
standoffs with a
needlenose pliers to lift
the power/analog board
off the divider panel.

Take Apart Power/Analog/Video Board - 9 2

16 .Lift the board from the

flyback transformer
side to clear the power
plug from the side panel.

17 .Pull the board forward

toward the speakers.

Replacement Note: If you’re

returning the power/
analog/video board to Apple,
exchange the board like­for-like and leave the cables
attached to the board.

Take Apart Power/Analog/Video Board - 9 3

661-2466

ßπ661-2465
(with switch at SW901)

Identifying Power/Analog/ Video Boards

There are two power/
analog/video boards in
service stock. The part
numbers are 661-2465 and
661-2466. These boards
must be exchanged like-for­like.

The 661-2465 board can be
identified by the presence of
a switch at location SW901,
located near the flyback
transformer. Refer to the
next page for switch
instructions.

Take Apart Power/Analog/Video Board - 9 4

Switch Instructions

If the iMac has the analog
board with the switch, the
switch must be set for the
type of the CRT (LG or CPT)
tube in the computer.

If the power/analog/video
board or the CRT are
replaced, make sure to set
the switch to the
appropriate position.

Refer to the next page for
information on how to
identify an LG and CPT CRT.

Take Apart Power/Analog/Video Board - 9 5

LG CRT

Identify an LG CRT by the
black plastic molding located
on the CRT neck. The LG
molding has the LG name at
the top and three holes.

If the iMac uses the 661­2465 power/analog board
(with the switch) and the
tube is an LG CRT, make sure
the switch is set to LG.

Take Apart Power/Analog/Video Board - 9 6

CPT CRT

Identify a CPT CRT by the
black plastic molding located
on the CRT neck. The CPT
molding has two holes in the
molding.

If the iMac uses the 661­2465 power/analog board
(with the switch) and the
tube is a CPT CRT, make
sure the switch is set to CPT.

iMac



Verifying a Defective Power/Analog/Video Board

Many of the power/analog/video boards returned to Apple as “bad” or “DOA” have no
trouble found at the repair facility. It is important to verify a defective power/analog/video
board properly before ordering a replacement. Follow the steps below to verify if the issue
is due to a bad power/analog/video board or if something else is causing the problem.

Products affected

• iMac (Slot Loading)

• iMac (Summer 2000)

• iMac (Early 2001)

• iMac (Summer 2001)

Procedure

1. Check for bent pins on the CRT neck (see Figure 1). Remove the video board and
observe the pins on the CRT neck. Make sure all of them are straight. If the pins are
not straight, carefully attempt to straighten them with a flatblade jeweler’s screwdriver
or needlenose pliers and test the board again.

Figure 1 CRT Neck Pins

073-0593 Rev. A

2. Make sure the video board is properly seated on the CRT neck (see Figure 2). The top
picture shows the video board improperly seated; the bottom picture shows it properly
seated. When the video board is properly seated, the plastic socket of the video board
slides up to the retaining ring on the CRT neck, just before the CRT neck rings.

critical

to function properly.

that the video board be fully seated in order for the power/analog/video board

It is

Figure 2 Video Board Improperly and Properly Seated

Verifying a Defective Power/Analog/Video Board -

2