Apple Macintosh Quadra Centris 605 Service Manual

K

Service Source

Macintosh LC Series/

Quadra 605

Macintosh LC, Macintosh LC II,

Macintosh LC III, Macintosh LC 475,

Macintosh Quadra 605

K

Service Source

Basics

Macintosh LC Series/Quadra 605

Basics Overview - 2

Overview

This manual includes
complete repair procedures
for the Macintosh LC Series/
Quadra 605, shown at left.

Figure: Macintosh LC Series, Quadra 605

K

Service Source

Specifications

Macintosh LC Series/Quadra 605

Specifications Introduction - 1

Introduction

Specifications information for this product can be found in this chapter and also in the

Spec Database, which you can access in one of three ways:

— Launch it directly by double-clicking the Apple Spec Database runtime alias at the top

level of the Main Service Source CD.
— Select "Apple Spec Database" from the Service Source drop-down main menu.
— Click the Acrobat toolbar icon for the database, which is near the right end of the

toolbar with the letters "SP."

Specifications Processor - 2

Processor

LC

LC II

LC III

Motorola 68020 microprocessor
16 MHz
16-bit internal data bus

Motorola 68030 microprocessor
16 MHz
16-bit internal data bus
Burst-mode RAM access

Motorola 68030 microprocessor
25 MHz
32-bit internal data bus
Burst-mode RAM access
Coprocessor socket

Specifications Processor - 3

LC 475/Quadra 605

Motorola 68LC040 microprocessor
25 MHz
32-bit internal data bus
Burst-mode RAM access

Specifications Memory - 4

Memory

DRAM

ROM

LC: 2 MB, expandable to 10 MB (100 ns or faster SIMMs)
LC II: 4 MB standard, expandable to 10 MB (100 ns or faster

SIMMs)

LC III: 4 MB standard, expandable to 36 MB (80 ns or faster

SIMMs)

LC 475/Quadra 605: 4 MB or 8 MB standard, expandable to 36

MB (80 ns or faster SIMMs)

LC/LC II: 512 K
LC III/LC 475/Quadra 605: 512K expandable to 1 MB

Specifications Memory - 5

VRAM

LC: 256K VRAM, upgradable to 512K
LC II: 256K VRAM SIMM, upgradable to 512K
LCIII: 512K VRAM on board, upgradable to 768K
LC 475/Quadra 605: Two 256K VRAM SIMMs, upgradable to 1MB

Specifications Disk Storage - 6

Disk Storage

Floppy Drive

Hard Drive

LC/ LC II/ LC III: Apple SuperDrive 1.4 MB Floppy Disk Drive
Optional second internal 1.4 MB floppy drive (LC only)
LC 475/Quadra 605: Apple SuperDrive 1.4 MB Floppy Disk Drive

or Apple SuperDrive Manual Insert Floppy Disk Drive

LC: 40 MB or 80 MB
LC II: 40 MB, 80 or 160 MB
LC III: 40, 80 or 160 MB
LC 475/Quadra 605: 160 or 230 MB

Specifications I/O Interfaces - 7

I/O Interfaces

Serial

SCSI

Apple Desktop Bus

Video

Sound

Two RS-232/RS-422 serial ports; mini DIN-8 connectors

SCSI interface; DB-25 connector

One ADB port; mini DIN-4 connector

One DB-15 monitor port for built-in video; DA-15 connector

LC/LC II/LC III: Mono sound input and output port; mini phono

plug

LC 475/Quadra 605: Mono sound input port; stereo output; mini

phono plug

Specifications I/O Interfaces - 8

Expansion Connector

LC: 96-pin processor-direct slot (PDS) supporting 020 direct

slot expansion card

LC II: 96-pin PDS supporting 020/030 direct slot expansion

card

LC III: 114-pin PDS supporting 020/030 direct slot expansion

card

LC 475/Quadra 605: 114-pin expansion slot supporting 030/

040 expansion cards. Accepts Macintosh LC compatible I/O
display, network, and video capture cards. Does not support
030 processor accelerator or cache cards.

Specifications I/O Devices - 9

I/O Devices

Keyboard

Mouse

Microphone

Apple Keyboard, Apple Keyboard II, Apple Extended Keyboard II,

or Apple Adjustable Keyboard connected through ADB ports
(mini DIN-4)

ADB mouse and ADB Mouse II connected through ADB ports (mini

DIN-4)

Electret, omnidirectional
Operates on 8 VDC supplied by microphone port on CPU

Specifications Sound and Video - 10

Sound and Video

Sound

Video

Monaural, 8-bit sound input at 11 or 22 kHz
LC, LC II, LC III: Monophonic, 8-bit sound generator supplying

same signal to both channels of stereo equipment

LC 475 and Quadra 605: Stereo output capability

LC and LC II provide built-in support for many monitors,

including

• Apple High-Resolution Monochrome Monitor

• AppleColor High-Resolution RGB Monitor

• Macintosh 12-Inch RGB Display

• Macintosh 12-Inch Monochrome Display

• Macintosh Color Display

• Apple Basic Color Monitor

Specifications Sound and Video - 11

Video (cont’d)

LC III, LC 475 and Quadra 605 provide up to 16-bit support on

12-, 13-, and 16-inch monitors and 8-bit support on 15­inch portrait and 21-inch monitors. LC III, LC 475 and Quadra
605 support all Apple monitors available at CPU introduction
dates, including

• Apple High-Resolution Monochrome Monitor

• AppleColor High-Resolution RGB Monitor

• Macintosh 12-Inch RGB Display

• Macintosh 12-Inch Monochrome Display

• Macintosh Color Display

• Apple Basic Color Monitor

• Macintosh 16-Inch Color Display (Macintosh LC III only)

LC III, LC 475 and Quadra 605 support NTSC and PAL.

Specifications Electrical - 12

Electrical

Line V oltage

Frequency

Maximum Power

100–240 VAC, automatically configured

LC Series: 47–63 Hz
Quadra 605: 50–60 Hz

LC/LC II: 50 W (not including monitor)
LC III: 30 W
Quadra 605: 26 W

Specifications Physical - 13

Physical

Dimensions

Weight

Height: 3.0 in. (7.7 cm)
Width: 12.2 in. (31.0 cm)
Depth: 15.0 in. (38.2 cm)

8.8 lb. (4.0 kg)

K

Service Source

Troubleshooting

Macintosh LC Series/Quadra 605

Troubleshooting General/ - 1

General

The Symptom Charts included in this chapter will help you
diagnose specific symptoms related to your product. Because cures
are listed on the charts in the order of most likely solution, try
the first cure first. 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.)

If you are not sure what the problem is, or if the Symptom Charts
do not resolve the problem, refer to the Flowchart for the product
family.

For additional assistance, contact Apple Technical Support.

Troubleshooting Symptom Charts/Error Chords - 2

Symptom Charts

Error Chords

Error chord sounds
during startup
(Macintosh LC)

Eight-tone error
chord sounds during
startup (LC II/III/
475/Quadra 605)

1 Replace SIMMs.
2 Perform SIMM verification on replacement logic board.
3 Replace logic board. Retain customer’s SIMMs.

1 Replace SIMMs.
2 Perform SIMM verification on replacement logic board.
3 Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Error Chords

(Continued)

- 3

Four-tone error
chord sounds during
startup (Macintosh
LC II)

Error Chords

1 Disconnect hard drive power cable and hard drive data cable

and reboot system. If startup sequence is normal, run
“Macintosh Hard Disk Test” and replace hard drive if
necessary.

2 Disconnect floppy drive cable and reboot system. If startup

sequence is normal, replace floppy drive.

3 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Built-in Video - 4

Built-in Video

Screen is dark, audio
and at least one drive
operate, fan runs,
and LED is lit

Screen is dark, audio
and drive do not
operate, but fan runs
and LED is lit

1 Adjust brightness on monitor.
2 Try monitor with another Macintosh computer.
3 Check battery.
4 Replace monitor. Troubleshoot defective monitor. See

Symptom Charts in appropriate monitor manual.
5 Replace video cable.
6 Replace VRAM SIMM.
7 Replace logic board. Retain customer’s SIMMs.
8 Replace power supply.

1 Remove expansion card, if present.
2 Remove peripherals.
3 Disconnect hard drive and floppy drive.
4 Replace SIMMs. Refer to Memory manual.
5 Replace logic board. Retain customer’s SIMMs.
6 Replace power supply.

Troubleshooting Symptom Charts/Built-in Video

(Continued)

- 5

Partial or whole
screen is bright and
audio is present, but
no video information
is visible

Screen is completely
dark, fan is not
running, and LED is
not lit

Built-in Video

1 Verify monitor works with another Macintosh.
2 Replace video cable.
3 Replace monitor.
4 Replace logic board. Retain customer’s SIMMs.

1 Plug monitor directly into wall socket. Verify that monitor

has power.
2 Remove expansion card, if present.
3 Remove peripherals.
4 Disconnect hard drive and floppy drive.
5 Replace power supply.
6 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Built-in Video

(Continued)

- 6

Vertical lines,
horizontal lines, or
snow appears on
screen, or screen is
completely dark;
startup tone is
normal

Built-in Video

1 Verify monitor works with another Macintosh.
2 Replace video cable.
3 Replace monitor.
4 Replace VRAM SIMM.
5 Replace logic board. Retain customer’s SIMMs.
6 Replace power supply.

(Continued)

Troubleshooting Symptom Charts/Floppy Drive - 7

Floppy Drive

Audio and video are
present, but internal
drive does not operate

Disk ejects; display
shows Mac icon with
blinking “X”

Disk does not eject 1 Switch off system and hold mouse button down while

1 Replace floppy drive cable.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.

1 Replace disk with known-good system disk.
2 Replace floppy drive cable.
3 Replace floppy drive.
4 Replace logic board. Retain customer’s SIMMs.

switching system back on.
2 Remove top cover.
3 Eject disk manually by pushing opened paper clip into hole

beside drive slot.
4 Replace floppy drive cable.
5 Replace floppy drive.

Troubleshooting Symptom Charts/Floppy Drive

(Continued)

- 8

Drive attempts to
eject disk, but doesn’t

Floppy Drive

1 Push disk completely in.
2 Eject disk manually by pushing opened paper clip into hole

beside drive slot.
3 Check that cover is completely on.
4 Replace floppy drive.

(Continued)

Troubleshooting Symptom Charts/Hard Drive - 9

Hard Drive

Internal hard drive
runs continuously

Internal hard drive
does not operate

1 Make sure System is version 6.0.7 (or later) for Macintosh

LC, version 7.0.1 (or later) for Macintosh LC II, or version

7.1 (or later) for LC III/475 and Quadra 605.
2 Replace hard drive cable.
3 Replace internal hard drive.
4 Replace logic board. Retain customer’s SIMMs.

1 Replace hard drive data cable.
2 Replace hard drive power cable.
3 Replace internal hard drive.
4 Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Peripherals - 10

Peripherals

Works with internal
or external SCSI
device but does not
work with both

Cursor does not move 1 Reboot system.

1 Verify that SCSI select switch on external device is set to

different priority from internal.
2 Verify that both ends of external SCSI device are terminated.
3 Replace terminator on external device.
4 Verify that terminator is installed on internal SCSI drive.
5 Replace SCSI select cable.

2 Check mouse connection.
3 If mouse was connected to keyboard, connect mouse to rear

ADB port and disconnect keyboard. If mouse works, replace

keyboard.
4 If mouse does not work in any ADB port, replace mouse.
5 Remove additional PDS cards.
6 Reset PRAM.
7 Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Peripherals

(Continued)

- 11

Cursor moves, but
clicking mouse
button has no effect

Double-click doesn’t
open application,
disk, or server

Peripherals

1 Replace mouse.
2 Replace logic board. Retain customer’s SIMMs.

1 Remove extra system files on hard drive.
2 Clear parameter RAM. System 7: Hold down <Command>

<Option> <P> <R> during startup but before “Welcome to

Macintosh” appears. System 6 and earlier: Hold down

<Command> <Option> <Shift> keys and select Control Panel

from Apple menu.
3 If mouse was connected to keyboard, connect mouse to rear

ADB port and disconnect keyboard. If mouse works, replace

keyboard.
4 If mouse does not work in any ADB port, replace mouse.
5 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Peripherals

(Continued)

- 12

No response to any
key on keyboard

Peripherals

1 Make sure System is version 6.0.7 (or later) for Macintosh

LC, version 7.0.1 (or later) for Macintosh LC II, or version

7.1 (or later) for LC III/475 and Quadra 605.
2 Check keyboard connection to ADB port.
3 Replace keyboard cable.
4 Replace keyboard.
5 Remove battery for 15 to 30 minutes to reset logic board.
6 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Peripherals

(Continued)

- 13

Known-good
LaserWriter does not
print

Known-good
ImageWriter or
ImageWriter II does
not print

Peripherals

1 Make sure that Chooser and Control Panel settings are

correct.

2 Make sure System is version 6.0.7 (or later) for Macintosh

LC, version 7.0.1 (or later) for Macintosh LC II, or version

7.1 (or later) for LC III/475 and Quadra 605.
3 Reset PRAM.

1 Make sure that Chooser and Control Panel settings are

correct.

2 Make sure System is version 6.0.7 (or later) for Macintosh

LC, version 7.0.1 (or later) for Macintosh LC II, or version

7.1 (or later) for LC III/475 and Quadra 605.
3 Check printer DIP switches.
4 Reset PRAM.
5 Replace printer interface cable.
6 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Miscellaneous - 14

Miscellaneous

Clicking, chirping,
or thumping

System shuts down or
restarts
intermittently

1 Disconnect hard drive. Replace drive if noise disappears.
2 Replace power supply.
3 Replace logic board. Retain customer’s SIMMs.

1 Make sure air vents on back and top of case are unobstructed.

Thermal protection circuitry may shut down computer. After

30 to 40 minutes, system should be OK.
2 Replace power cable.
3 Install standoffs on LC Ethernet Card, if present.
4 Replace power supply.
5 Replace SIMMs. Refer to Memory manual.
6 Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 15

System
intermittently
crashes or locks up

No sound from
speaker

Miscellaneous

1 Make sure System is version 6.0.7 (or later) for Macintosh

LC, version 7.0.1 (or later) for Macintosh LC II, or version

7.1 (or later) for LC III/475 and Quadra 605.
2 Make sure software is known-good.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace SIMMs.
5 Replace power supply.

1 Verify that volume setting in Control Panel is 1 or above.
2 Reset PRAM.
3 Verity nothing is connected to sound-out port.
4 Replace speaker.
5 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 16

System seems to boot,
then message “Finder
is old version”
displays

System
intermittently doesn’t
power on

Miscellaneous

1 Clear parameter RAM. System 7: Hold down <Command>

<Option> <P> <R> during startup but before “Welcome to
Macintosh” appears. System 6 and earlier: Hold down
<Command> <Option> <Shift> keys and select Control Panel
from Apple menu.

2 Replace logic board. Retain customer’s SIMMs.

1 Check cables.
2 Plug monitor directly into wall socket. Verify that monitor

has power.
3 Try known-good keyboard and ADB cable.
4 Replace power cord.
5 Check batteries. See “Battery Verification” in Additional

Procedures.
6 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 17

Monitor raster width
too narrow

Stand-alone system
hangs or crashes

Miscellaneous

Refer to Adjustments section in the appropriate monitor manual
for horizontal size (width) adjustment.

1 If using an older LC Ethernet card with a computer running

System 7, disable virtual memory.
2 Clear parameter RAM. System 7: Hold down <Command>

<Option> <P> <R> during startup but before “Welcome to

Macintosh” appears. System 6 and earlier: Hold down

<Command> <Option> <Shift> keys and select Control Panel

from Apple menu.
3 Upgrade to latest revision of software.
4 Remove additional RAM and PDS card.
5 Replace logic board

(Continued)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 18

Miscellaneous

Networked 33 MHz
LC III freezes

Clock doesn’t run 1 Replace battery. See “Battery Replacement” in Additional

System doesn’t
recognize more than
10 MB of RAM (LC/LC
II)

1 Verify 10Base-T cable is secure.
2 Replace 10Base-T adapter card.
3 Remove additional RAM and external SCSI devices.
4 Replace logic board.

Procedures.
2 Reset PRAM.
3 Verify nothing is connected to sound-out port.
4 Replace logic board. Retain customer’s SIMMs.

Although you can install up to12 MB of RAM in Macintosh LC/LC II
computers, 10 MB is the maximum amount of RAM that the
system recognizes.

(Continued)

K

Service Source

T ak e Apart

Macintosh LC Series/Quadra 605

Take Apart Top Cover - 1

Quadra 605

LC/LC II/LC III/
LC 475

Top Cover

No preliminary steps are
required before you begin
this procedure.

1 Remove the case screw if

one is present.

2 Lift the tabs at the back

of the lid.

3 Lift the top cover

straight up.

Take Apart Hard Drive - 2

Hard Drive

Before you begin, remove

Hard Drive

the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Hard Drive - 3

Hard Drive
Power Cable

Hard
Drive
Power
Connector

Hard Drive

Data Cable

1 Release the locking tab

and disconnect the hard
drive power cable from
the connector on the
logic board.

2 Disconnect the hard

drive data cable from the
connector on the logic
board.

Hard Drive Data
Cable Connector

Take Apart Hard Drive - 4

3 Release the two plastic

latches on one side of the
hard drive and lift the
drive slightly. Repeat on
the other side of the
drive and remove the
drive (with carrier)
from the computer.

Replacement Note:

information on removing the
hard drive from the carrier
and returning drives,
cables, and carriers to
Apple, refer to “Additional
Procedures” in the Hard
Drives manual.

For

Take Apart Fan/Speaker Assembly (LC) - 5

Fan/Speaker Assembly (LC)

Fan/Speaker

Assembly

Before you begin, remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Fan/Speaker Assembly (LC) - 6

1 Release the latch on one

Latch

end of the fan/speaker
assembly, and lift the
assembly slightly.

Latch

2 Release the other latch

and remove the fan/
speaker assembly from
the bottom case.

Take Apart Fan (LC II/III) - 7

Fan (LC II/III)

Before you begin, remove
the top cover.

Fan

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Fan (LC II/III) - 8

1 Disconnect the fan cable

from the fan connector
on the logic board.

Fan Cable

Fan
Connector

Latch

Latch

2 Release the plastic

latches and lift the fan
from the case.

Replacement Caution:

Be
sure to install the fan with
the logo side down, or the fan
may damage the computer.

Take Apart Speaker (LCII/III) - 9

Speaker (LCII/III)

Before you begin, remove
the following:

Speaker

• Top cover

• Hard drive

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Speaker (LCII/III) - 10

1 Disconnect the speaker

cable from the speaker
connector on the logic
board.

Speaker Cable

Speaker
Connector

Latch

Speaker

Latch

2 Release the plastic

latches and lift the
speaker from the case.

Replacement Note:

Before
reconnecting the speaker
cable, thread it through the
top two brackets that hold
the hard drive in place.

Take Apart Floppy Drive - 11

Floppy Drive

Before you begin, remove

Floppy Drive

the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Floppy Drive - 12

Floppy Drive
Cable

Floppy Drive Cable Connector

Macintosh LC

1 Disconnect the floppy

drive cable from the
connector on the logic
board.

Note:

Retain the old
floppy drive cable. Use
the old cable on the new
exchange module.

2 Release the two latches

on one side of the drive
and lift the drive
slightly. Repeat on the
other side and remove
the drive from the case.

Take Apart Floppy Drive - 13

Replacement Note:

you install a replacement

1.4 MB SuperDrive, you
must remove the dust shield.

Before

Take Apart Floppy Drive - 14

LC II/LC III/Quadra 605

Floppy Drive

Connector

Latch

Latch

Floppy

Drive

1 Disconnect the floppy

drive cable from the
connector on the logic
board.

2 Release the two latches

at the rear of the floppy
drive and remove the
drive from the case.

Replacement Note:

you install a replacement
auto-inject 1.4 MB
SuperDrive, you must
remove the dust shield, if
present.

Before

Take Apart Floppy Drive - 15

Replacement Note:

encounter either an Apple
SuperDrive or a manual
eject floppy drive in some
models. Replace floppy
drives like for like.

You may

Take Apart Power Supply - 16

Power Supply

Before you begin, remove
the top cover.

Power Supply

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Power Supply - 17

1 Disconnect the power

supply cable from the
connector on the logic
board.

Power
Supply
Cable

Power
Supply
Connector

2 Release the two latches

that secure the front end
of the power supply to
the bottom case, and lift
the power supply out of
the case.

Take Apart Logic Board - 18

Logic Board

Before you begin, remove
the following:

• Top cover

• Fan/speaker assembly
(LC)

• Fan (LC II/III/475 and
Quadra 605)

Logic Board

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Logic Board - 19

1 Disconnect the following

Power Supply Cable

cable connectors from
the logic board:

Floppy Drive
Cable

• Hard drive power
cable

• Hard drive data cable

Fan Cable

Speaker Cable

• Floppy drive cable

• Power supply cable

• Fan cable (LC II/III/

Hard Drive
Data Cable

LC 475 and Quadra

605)

• Speaker cable (LC II/
III/LC 475 and

Hard Drive
Power Cable

Expansion
Connector

Expansion Card

Quadra 605)

2 Remove the expansion

card (if installed).

Take Apart Logic Board - 20

Caution:

be sure the power on/off
button clears the rear panel
before you remove the logic
board. While lifting the
board, do not touch any
components or connectors on
the back of the logic board.
(The oil from your skin can
harm the connectors.)

In the next step,

Take Apart Logic Board - 21

3 Using your forefingers,

spread the two latches
that secure the logic
board to the bottom case.
At the same time, using

Latch

your right thumb, push
on the expansion
connector and slide the
logic board toward the
front of the case.

Latch

Expansion Connector

Take Apart Logic Board - 22

4 Gently lift the board

from the case.

Replacement Note:

the SIMMs from the
defective logic board and
install them on the
replacement logic board.

Remove

Take Apart Logic Board - 23

Quadra 605 Logic Board

J18

Jumper

5 Remove the jumper from

the pins at location J18
on the defective board.

Replacement Note:

The
LC 475 and Quadra 605
use the same logic board
replacement. The Quadra
605 requires a jumper
to connect the pins at
location J18. Quadra
605 service
replacement logic boards
do not include the
jumper.

Take Apart Logic Board - 24

Quadra 605 Logic Board

6 Install a jumper on the

pins at location J18 on
the Quadra 605 service
replacement logic board.

Jumper

J18

Take Apart Logic Board - 25

Grounding Pad

Foam

Connecting

Grounding Spring

Replacement Note:

The
replacement logic boards for
the LC 475 and the Quadra
605 do not include
grounding connectors. You
must remove the grounding
connector from the
defective board and install
it on the replacement board.

There are two versions of
grounding connectors, a
foam grounding pad and a
connecting grounding
spring. You may encounter
either version on LC 475
and Quadra 605 logic boards.

Take Apart Logic Board - 26

Foam Grounding

Pad

Connecting

Grounding Spring

Audio Ports

Rough Side
Out

Audio Ports

7 Install the foam

grounding pad on the
audio ports of the
replacement logic board
with the rough side of
the pad facing out.

8 Install the connecting

grounding spring on the
audio ports of the
replacement logic board
with the arms of the
spring facing out.

Spring
Arms
Out

K

Service Source

Upgrades

Macintosh LC Series/Quadra 605

Upgrades LC Ethernet Upgrade - 1

LC Ethernet Upgrade

Before you begin, remove
the top cover.

LC Ethernet Card

Caution:

precautions in Bulletins/
Safety.

Note:

Ethernet Card package
includes the LC Ethernet
Card and standoffs. If you
order service parts, you
must order the standoffs
separately from the card.

Review the ESD

The finished goods LC

Upgrades LC Ethernet Upgrade - 2

1 Insert the short standoff

in the hole on the corner
near the connector end of

Long Standoff

the card.

2 Insert the long standoff

in the hole on the center
edge of the card.

Short Standoff

Caution:

Failure to
install the standoffs can
cause the computer to
restart intermittently.

Upgrades LC Ethernet Upgrade - 3

LC Ethernet Card

LC Ethernet Card

External Connector

3 Position the card so that

the external connector
extends through the
expansion connector
opening.

4 Pivot the card over the

expansion slot.

5 Press the connector

pins into the connector
slot.

Note:

Do not force the card
into the slot. If you meet a
lot of resistance, pull the
card out and reseat it.

Upgrades LC II Upgrade - 4

LC II Upgrade

Before you begin, remove
the following:

Macintosh LC Logic Board

• Top cover

• Fan/speaker assembly

• Logic board

Caution:

precautions in Bulletins/
Safety.

Note:

upgrade kit upgrades a
Macintosh LC to a Macintosh
LC II. The upgrade kit
includes a Macintosh LC II
logic board and cover.

Review the ESD

A Macintosh LC II

Upgrades LC II Upgrade - 5

1 Install the Macintosh LC

II logic board.

Macintosh LC II Logic Board

2 Install the customer’s

SIMMs into the new logic
board.

Upgrades LC II Upgrade - 6

Sound-Out Port

Sound Input Port

Replacement Note:

After
replacing the fan/speaker
assembly, install the
Macintosh LC II top cover.

Make sure that the
connections to the sound­out and sound input ports
are correct. Inserting
equipment into the wrong
port can damage the
computer or equipment.

Upgrades LC to LC III Upgrade - 7

LC to LC III Upgrade

Before you begin, remove

Macintosh LC III Upgrade

the following:

• Top cover

• Fan/speaker assembly

• Floppy drive

• Logic board

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Upgrades LC to LC III Upgrade - 8

Note:

A Macintosh LC III
upgrade kit includes LC III
logic board, bottom case,
top cover, power supply,
speaker, fan, and floppy
drive carrier.

Note:

You will use only a
few parts from the original
LC in upgrading an LC to an
LC III. The following
procedures explain how to
remove the LC parts and
install them into the LC III
upgrade unit.

Upgrades LC to LC III Upgrade - 9

1 Remove the Macintosh LC

floppy drive and floppy
drive cable. (See
“Floppy Drive” in Take
Apart.)

2 Remove the floppy drive

and cable from the LC

LC Floppy Drive Carrier

Floppy Drive Cable Apple 1.4 MB SuperDrive

floppy drive carrier.

Upgrades LC to LC III Upgrade - 10

3 Install the floppy drive

with cable into the LC III
floppy drive carrier.

LC III Upgrade Floppy

Drive Carrier

Apple 1.4 MB SuperDrive

Floppy Drive Cable

Upgrades LC to LC III Upgrade - 11

4 Install the floppy drive

1.4 MB SuperDrive in

LC III Upgrade Carrier

into the floppy drive
bay of the LC III upgrade
bottom case.

5 Connect the floppy drive

cable to the floppy drive
connector on the logic
board.

LC III Floppy Drive Bay

Floppy Drive
Cable Connector

LC III Bottom Case

Replacement Note:

If you
are installing a replacement
auto-inject 1.4 MB
SuperDrive, you must
remove the dust shield, if
present.

Upgrades LC to LC III Upgrade - 12

6 Remove the Macintosh LC

Hard Drive

Data Cable

LC Hard Drive
with Carrier

hard drive with
carrier, hard drive data
cable, and hard drive
power cable. (See “Hard
Drive” in Take Apart.)

7 Install the LC hard drive

into the hard drive bay
of the LC III upgrade

LC III Hard Drive Bay

Hard Drive

Power Cable

bottom case.

8 Connect the hard drive

data cable and hard
drive power cable
connectors to the
connectors on the LC III
upgrade logic board.

LC III Bottom Case

Upgrades LC to LC III Upgrade - 13

9 Install the LC VRAM

SIMMs and the expansion
card (if present) into
the LC III upgrade logic
board.

Note:

DRAM SIMMs
from an LC are not
compatible with the LC
III.

10 Attach the top cover.

Upgrades LC II to LC III Upgrade - 14

LC II to LC III Upgrade

Before you begin, remove

Macintosh LC III Upgrade

the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Upgrades LC II to LC III Upgrade - 15

Note:

A Macintosh LC III
upgrade kit upgrades a
Macintosh LC II to a
Macintosh LC III. The
upgrade kit includes a
Macintosh LC III logic board,
top cover, fan, speaker, and
a floppy drive carrier.
When upgrading an LC II to
an LC III, you will need only
the LC III logic board.

Upgrades LC II to LC III Upgrade - 16

1 Install the Macintosh LC

III logic board. (See Take
Apart chapter.)

Macintosh LC III Logic Board

Upgrades LC II to LC III Upgrade - 17

2 Install the fan and new

Macintosh LC III top
cover (see Take Apart
chapter).

Sound-Out Port

Sound Input Port

Replacement Caution:

Make
sure that the connections to
the sound-out and sound
input ports are correct.
Inserting equipment into
the wrong port can damage
the computer or equipment.

Upgrades LC 475 Logic Board Upgrade - 18

LC 475 Logic Board Upgrade

Macintosh LC II or III

Logic Board

Before you begin, remove
the following:

• Top cover

• Fan

• Logic board

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Upgrades LC 475 Logic Board Upgrade - 19

Note:

A Macintosh LC 475
upgrade kit upgrades a
Macintosh LC II or III to a
Macintosh LC 475. The
upgrade kit includes a
Macintosh LC 475 logic
board and product ID labels.

Upgrades LC 475 Logic Board Upgrade - 20

1

Note:

The upgrade kit
does not include a
connecting grounding
spring. You must order

Audio Ports

this part separately.

Before installing the
upgrade logic board,
install the connecting
grounding spring on the
audio ports of the board,
with the arms of the
spring facing out.

Connecting Grounding Spring

Upgrades LC 475 Logic Board Upgrade - 21

2 Install the Macintosh LC

475 logic board.

Macintosh LC 475 Logic Board

Upgrades LC 475 Logic Board Upgrade - 22

3 Install the fan and top

cover (see Take Apart
chapter).

Upgrades Macintosh Processor Upgrade - 23

Macintosh

Macintosh Processor Upgrade
(including 256K Cache Card)

Processor Upgrade

Before you begin, remove
the following:

• Top cover

• I/O door

• Logic board

• Card in the PDS slot (if
any)

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Upgrades Macintosh Processor Upgrade - 24

Note:

Macintosh Processor

Upgrade with

256K Cache Card

Hook-and-Loop

Fasteners

The Macintosh
Processor Upgrade kit
allows 68LC040 computers
to switch between a
PowerPC 601 processor
and a 68LC040 processor.
The upgrade board includes

040 Heat

Sink

the PowerPC 601 processor
on board and a socket to
accept the customer’s
68LC040 processor.

Note:

Refer to the Macintosh
Processor Upgrade manual
under the Power Macintosh

256K Cache

Card

Spacer

Processor Removal Tool

menu for information about
specifications and
troubleshooting.

Upgrades Macintosh Processor Upgrade - 25

Note:

The Macintosh
Processor Upgrade comes
packaged with the Macintosh
Processor Upgrade board,
256K cache card, 040 heat
sink, and hook-and-loop
fasteners. If you need to
order service replacement
parts, order the parts
separately.

Note:

To install the upgrade,
you will need a processor
removal tool. Order the
removal tool as a separate
service part.

Upgrades Macintosh Processor Upgrade - 26

Note:

The cache card comes
installed on the upgrade
board.

Upgrades Macintosh Processor Upgrade - 27

Installation Procedure Overview

There are three basic steps
to installing the Macintosh
Processor Upgrade on LC
475 and Quadra 605
computers.

• Remove the 68LC040

processor from the
customer’s logic board

• Install the 68LC040

processor on the upgrade
board

• Install the upgrade board

on the logic board

Detailed procedures follow.

Upgrades Macintosh Processor Upgrade - 28

1 Locate the 68LC040

processor on the logic
board.

2 Remove the 68LC040

processor from the logic
board

68LC040
Processor

Upgrades Macintosh Processor Upgrade - 29

Note:

Processor

This graphic
shows the proper way to
remove any 68LC040
chip from its logic
board. Your logic board
may differ somewhat
from this graphic

3 Position the teeth of the

processor removal tool
in the groove between
the processor and the
logic board socket.

Processor

Removal Tool

Processor Socket

Upgrades Macintosh Processor Upgrade - 30

Caution:

up on the handle of the
processor removal tool.
Pressing down could
damage components on
the logic board.

Caution:

side of the processor
only slightly to avoid
bending the pins.

4 Gently lift up the

processor removal tool
handle and pry up each
side of the processor
from the socket.

5 Remove the processor.

Be sure to lift

Pry up each

Upgrades Macintosh Processor Upgrade - 31

Install the 68LC040
Processor on the
Upgrade Board

Alignment Corners

Spacer

68LC040 Processor

Note:

The alignment corner
of the 68LC040 processor is
missing one pin. The
alignment corner of the
spacer is missing a pin hole.

1 Position the spacer

alignment corner over
the 68LC040 processor
alignment corner

2 Place the spacer on the

processor.

Upgrades Macintosh Processor Upgrade - 32

68LC040
Processor

Caution:

Forcing the
68LC040 processor
connector pins into the
socket could damage the pins.
If the processor resists
installation, check the pin
alignment.

Caution:

Place the upgrade
board on a firm even surface
to avoid bending the upgrade
board when pressing the
processor into the socket.

Caution:

Use two thumbs to
evenly distribute the
pressure as you press the
processor into the socket.

Upgrades Macintosh Processor Upgrade - 33

3 Hold the processor and

spacer together and
position the spacer
alignment corner over
the upgrade socket
alignment corner.

4 Press the processor

connector pins into the
socket until you hear a
“snap.”

Upgrades Macintosh Processor Upgrade - 34

Note:

On a correctly
installed 040 processor, a
very small gap separates the
040 chip from the metal

040 Processor

spacer. A larger gap caused
by the board barrel sockets

Spacer

separates the upgrade board
and the spacer.

Small Gap

Barrel Sockets

Upgrades Macintosh Processor Upgrade - 35

5 Peel the paper from the

back of the heat sink and
install the heat sink on
the processor.

040 Heat Sink

Note:

Make sure the
040 heat sink is aligned
with the sides of the
processor.

68LC040
Processor

Upgrades Macintosh Processor Upgrade - 36

Install the Upgrade Board

Note:

The next step explains

how to prepare the logic

Anti-Static Foam

Logic Board,

Bottom Side

EMI Clip

board to accept the upgrade
board.

Caution:

the bottom of the LC 475 and
Quadra 605 logic boards flex
easily. Do not apply heavy
pressure directly to these
clips or to the logic board,
or you may bend the board.

The EMI clips on