Apple Macintosh Quadra Centris 650 Service Manual

K

Service Source

Centris 650/Quadra 650

K

Service Source

Basics

Centris 650/Quadra 650

Basics Overview - 1

Overview

This manual includes
complete repair procedures
for the Macintosh Centris
650/Quadra 650 shown at
left.

Figure: Macintosh Centris 650/Quadra 650

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Service Source

Specifications

Centris 650/Quadra 650

Specifications Processors - 1

Processors

Centris 650

Quadra 650

Coprocessor

Addressing

Motorola 68040
25 MHz
Built-in memory management unit (MMU)

Motorola 68040
33 MHz
Built-in memory management unit (MMU)

Optional floating-point unit (FPU)

32-bit internal registers
32-bit address bus
32-bit data bus

Specifications Memory - 2

Memory

RAM

ROM

PRAM

VRAM

Clock/calendar

4 or 8 MB RAM, expandable to 132 MB (72-pin SIMM)

1 MB

256 bytes nonvolatile parameter memory

512K, expandable to 1 MB

CMOS custom chip with long-life lithium battery

Specifications Disk Storage - 3

Disk Storage

Floppy Drive

Hard Drive

CD-ROM

1.4 MB Apple SuperDrive

Internal Apple SCSI hard drive
80 MB to 500 MB

Optional internal 5.25-in. CD-ROM drive

Specifications I/O Interfaces - 4

I/O Interfaces

SCSI

Apple Desktop Bus

Serial

NuBus

One SCSI port; DB-25 connector
Supports a maximum of six external devices (internal SCSI
devices include the computer, which is always device 7)

Two Apple Desktop Bus (ADB) ports; mini-Din-4 connectors
Low-speed synchronous serial interface

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

230.4 Kbps maximum

0.92 Mbps maximum, clocked externally

Three NuBus slots

Specifications I/O Interfaces - 5

Expansion Slot

Sound

Video

Ethernet

One inline processor-direct slot

One stereo-capable output port
One monaural input port

One video port, DB-15 connector
Supports Apple monitors (8-bit)
VGA and SVGA monitors require a special adapter cable

On-board Apple Ethernet port

Specifications I/O Devices - 6

I/O Devices

Keyboard

Mouse

Microphone

Standard, extended, or adjustable keyboard connected through two

ADB ports
Maximum power draw for all ADB devices: 500 mA
Keyboard draws 25–80 mA

ADB Mouse II; mechanical tracking optical shaft or contact
encoding (low power)

Optional electret, omnidirectional microphone
Microphone output voltage is 4 mV peak to peak at normal value
Mini phone plug connector

Specifications Sound and Video - 7

Sound and Video

Video Display

Centris 650/Quadra 650 supports these Apple monitors:

• Macintosh 12” Monochrome Display

• Macintosh 12” RGB Display

• AppleColor High-Res RGB 13” Monitor

• Macintosh Color Display

• Macintosh 15” Portrait Display

• Macintosh 16” Color Display

• Apple Two-Page 21” Monochrome Monitor

• Macintosh 21” Color Display
Supports NTSC and PAL
Supports VGA monitors (640 pixels by 480 pixels only) and
SVGA monitors (800 pixels by 600 pixels only) with
appropriate adapter cable

Specifications Sound and Video - 8

Sound

Custom sound chip supports stereo playback from compact discs
and computer-generated stereo sounds through stereo output port
Monaural sound input port

Specifications Electrical - 9

Electrical

Line V oltage

Frequency

100–240 VAC

50–60 Hz
112 W maximum, not including display power

Specifications Physical - 10

Physical

Dimensions

Height: 6.0 in. (152 mm)
Width: 13.0 in. (330 mm)
Depth: 16.5 in. (419 mm)
Weight
25 lb. (11.3 kg)
Weight will vary based on internal devices installed.

Specifications Environmental - 11

Environmental

Operating Temperature

Storage Temperature

Relative Humidity

Altitude

50–104°F (10–40°C)

–40F to 116.6°F (–40 to 47°C)

10–90% RH (noncondensing)

0–10,000 ft. (3,048 m)

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Service Source

Troubleshooting

Centris 650/Quadra 650

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

One-part error
chord sounds during
startup sequence

1 Disconnect hard drive power cable and hard drive data cable.

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.

Troubleshooting Symptom Charts/System - 3

System

Does not power on;
screen is black, fan is
not running and LED
is not lit

Clicking, Chirping or
thumping

1 Check cables.
2 Plug monitor directly into wall socket, and verify that

monitor has power.
3 Replace power cord.
4 Replace power supply.
5 Replace logic board.

1 Replace power supply.
2 Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/System

(Continued)

- 4

System shuts down
intermittently

System
intermittently
crashes or locks up.

System

1 Check that air vents are clear. Thermal protection circuitry

2 Replace power cord.
3 Check batteries. Refer to “Battery Verification” in

4 Replace power supply.
5 Replace logic board. Retain customer’s SIMMs.

1 Verify that system software is correct version.
2 Disconnect external SCSI devices.
3 Verify that software is known-good.
4 Replace SIMMs. (Refer to Hardware/Memory.)
5 Replace power supply.
6 Replace logic board. Retain customer’s SIMMs

(Continued)

may shut down system. After 30 to 40 minutes, system

should be OK.

Additional Procedures.

Troubleshooting Symptom Charts/

System (Continued)

- 5

Does not start up with
out a monitor attached

System

Verify that the Chooser and Control Panels are set correctly.

(Continued)

Troubleshooting Symptom Charts/Video - 6

Video

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

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

1 Adjust brightness on monitor.
2 Clear parameter RAM. Hold down <Command> <Option>

<P><R> during startup but before Welcome to Mac appears.
3 Check cables.
4 Replace monitor. Refer to appropriate monitor manual to

troubleshoot defective monitor.
5 Replace video card.
6 Replace VRAM SIMMs.
7 Replace logic board. Retain customer’s SIMMs.

1 Remove peripherals.
2 Remove NuBus cards.
3 Replace DRAM SIMMs.
4 Replace VRAM SIMMs.
5 Replace power supply.
6 Replace logic board.

Troubleshooting Symptom Charts/Video

(Continued)

- 7

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

Video

1 Check cables
2 Clear parameter RAM. Hold down <Command> <Option>

3 Replace monitor. Refer to appropriate monitor manual to

4 Replace video cable.
5 Replace VRAM SIMMs.
6 Replace logic board. Retain customer’s SIMMs.

1 Verify that external power cables are properly connected.
2 Remove peripherals.
3 Remove NuBus cards.
4 Replace power supply.
5 Replace logic board. Retain customer’s SIMMs.

(Continued)

<P><R> during startup but before Welcome to Macintosh

appears.

troubleshoot defective monitor.

Troubleshooting Symptom Charts/Floppy Drive - 8

Floppy Drive

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

Floppy disk ejects,
and display shows Mac
icon with blinking
“X”

Floppy disk does not
eject

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

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

1 Switch off system and hold mouse button down while

switching on.
2 Eject disk manually.
3 Replace floppy drive cable.
4 Replace floppy drive.

Troubleshooting Symptom Charts/Floppy Drive

(Continued)

- 9

Floppy drive
attempts to eject disk
but doesn’t

Floppy Drive

1 Push floppy disk completely in.
2 Eject floppy disk manually.
3 Replace floppy drive.

(Continued)

Troubleshooting Symptom Charts/Hard Drive - 10

Hard Drive

Internal hard drive
runs continuously

Internal hard drive
does not operate

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

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

Troubleshooting Symptom Charts/CD-ROM Drive - 11

CD-ROM Drive

CD-ROM drive does
not accept a compact
disc

Macintosh does not
display CD-ROM
drive icon

1 Exchange disk (if disk is dirty or

damaged).

2 Replace CD-ROM drive mechanism.

1 Verify that CD-ROM extension is in System Folder.
2 Verify the disc is in the drive correctly.
3 Replace CD-ROM drive mechanism.
4 Replace power supply.
5 Replace SCSI data cable.

Troubleshooting Symptom Charts/Peripheral - 12

Peripheral

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

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

differently from any internal SCSI device.
2 Verify that the hard drive is terminated and the CD-ROM

drive is not terminated.
3 Replace the terminator on external SCSI device.
4 Replace SCSI cable.
5 Replace the SCSI select cable on external SCSI device.

Troubleshooting Symptom Charts/Peripheral

(Continued)

- 13

Cursor moves, but
clicking the mouse
button has no effect

Double-click does not
open application,
disk, or server

Peripheral

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

1 Remove duplicate system files from hard drive.
2 Clear parameter RAM. Hold down <Command> <Option>

<P><R> during startup but before Welcome to Macintosh

appears.
3 If mouse was connected to keyboard, connect mouse to

computer ADB port instead. If mouse works, replace

keyboard.
4 If mouse does not work in any ADB port on computer, replace

mouse.
5 Replace logic board. Retain customer’s SIMMs.

(Continued)

Troubleshooting Symptom Charts/Peripheral

(Continued)

- 14

Peripheral

No response to any
key on the keyboard

Cursor does not move 1 Reboot computer.

1 Verify that keyboard is connected to ADB port.
2 Replace keyboard cable.
3 Replace keyboard.
4 Replace logic board. Retain customer’s SIMMs.

2 Verify that mouse is connected properly.
3 Clear parameter RAM. Hold down <Command> <Option>

<P><R> during startup but before Welcome to Macintosh

appears.
4 If mouse was connected to keyboard, connect mouse to

computer ADB port instead. If mouse works, replace

keyboard.
5 If mouse does not work in any ADB port on computer, replace

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

(Continued)

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Service Source

T ak e Apart

Centris 650/Quadra 650

Take Apart Top Cover - 1

Top Cover

Captive

Screw

Top

Cover

No preliminary steps are
required before you begin
this procedure.

1 Loosen the captive

screw.

Caution:

force on the captive
screw will damage the
top cover.

2

Note

tilt the top cover when
you remove it.

Slide the top cover
toward the front 1 inch.

Excessive

: Do not attempt to

Take Apart Top Cover - 2

Lift the top cover
straight up.

Replacement Note

not jar the reset/
interrupt switch and
light pipe out of
alignment when you
replace the top cover.

: Do

Take Apart Power Supply - 3

Power Supply

Before you begin remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Power Supply - 4

1 If a CD-ROM drive is

installed, squeeze its
side tabs and pull the
drive out an inch or two
to more easily reach the
power supply.

CD-ROM Drive

Take Apart Power Supply - 5

2 Remove the power

Power Supply

Screw

Power SupplyRear Bezel

supply screw from the
rear bezel.

3 Pry the latch away from

the base of the power
supply.

4 Grasp the power supply

and firmly lift it out of
the drive mount chassis.

Note

: The firm lifting
motion disconnects the
power supply connector
from the logic board.

Latch

Take Apart Drive Chassis - 6

Drive Chassis

Before you begin, remove
the following:

• Top cover

• Power supply

Take Apart Drive Chassis - 7

1 Disconnect these cables:

• Floppy drive cable

• SCSI power cable

• SCSI data cable

Floppy
Drive

Cable

SCSI Power
Cable

SCSI Data Cable

Take Apart Drive Chassis - 8

2 If a CD-ROM drive is

installed, disconnect
these cables:

• SCSI power cable

• SCSI data cable

CD-ROM

Drive

CD-ROM

Audio Cable

SCSI Power Cable

SCSI Data Cable

• CD-ROM audio cable

Take Apart Drive Chassis - 9

3 Remove the two drive

chassis screws.

Drive Chassis

Take Apart Drive Chassis - 10

4 Lift the front of the

drive chassis until the
chassis is perpendicular
to the bottom case.

Note:

The chassis
swivels where the
chassis tabs meet the
bottom cover.

Take Apart Drive Chassis - 11

5 Pull the chassis forward

and gently guide the
chassis tabs from the

Chassis

(Perpendicular

for Removal)

Chassis

(Installed)

slots in the bottom case.

6 Remove the chassis.

Take Apart Drive Chassis - 12

7

Replacement Note:

Carefully seat the bottom
corners of the drive

Drive Chassis

chassis into the guides in
the case bottom.

Drive
Chassis

Guides

Take Apart Floppy Drive - 13

Floppy Drive

Before you begin, remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Floppy Drive - 14

Tab

Screw

Floppy
Drive
Cable

Floppy Drive

1 Disconnect the floppy

drive cable from the
floppy drive.

2 Remove the floppy drive

mounting screw.

3 Pry up the mounting tab

and slide out the floppy
drive.

Replacement Note:

You may
encounter either an auto­inject or manual-inject 1.4
MB floppy drive. Replace
floppy drives like for like.

Take Apart Hard Drive - 15

Hard Drive

Before you begin, remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Hard Drive - 16

1 Disconnect the SCSI data

cable and the SCSI
power cable from the

Hard Drive

hard drive.

2 Remove the hard drive

mounting screw from the
carrier.

SCSI Data

Cable

Screw

SCSI Power Cable

3 Lift the back of the hard

drive and slide the hard
drive carrier out of the
drive chassis.

Replacement Note:

For
information on removing
the hard drive from the
carrier and returning
drives, cables, and
carriers to Apple, refer

Take Apart Hard Drive - 17

to the Hard Drives
manual (Hardware/
Service Manual/Drives/
Hard Drives).

Take Apart CD-ROM Drive - 18

CD-ROM Drive

Before you begin, remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Note:

optional.

Review the ESD

A CD-ROM Drive is

Take Apart CD-ROM Drive - 19

1 Squeeze the side tabs and

pull the drive out a few
inches to more easily
perform the next step.

CD-ROM Drive

Take Apart CD-ROM Drive - 20

2 Disconnect these cables

from the CD-ROM drive:

• Audio cable

• SCSI power cable

CD-ROM

Drive

CD-ROM

Audio Cable

SCSI Power Cable

SCSI Data Cable

• SCSI data cable

Take Apart CD-ROM Drive - 21

3 Slide out the CD-ROM

drive.

CD-ROM Drive

Take Apart CD-ROM Drive - 22

Key

Replacement Note:

The
connectors on the SCSI data
cable are keyed. You may
need to twist the cable to
insert the connector
properly.

Take Apart Speaker - 23

Speaker

Before you begin, remove
the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Speaker - 24

1 Disconnect the speaker

cable from the logic
board.

2 Remove the speaker

mounting screws and
pull out the speaker.

Note:

There is more than

one version of speaker for

Speaker

the computer. Speakers
install with four or two
screws, depending on the

Speaker

Cable

Logic Board

version.

Take Apart Logic Board - 25

Logic Board

Before you begin, remove
the following:

• Top cover

• Power supply

• Drive chassis

• Reset/Interrupt switch

• Speaker

Logic
Board

Take Apart Logic Board - 26

1 Remove the screw in the

center of the logic board.

2 Slide the logic board

Screw

toward the front about
1/2 inch and lift the
board out of the case.

Take Apart Logic Board - 27

Logic Board

Logic Board

Replacement Note:

Remove
the customer’s SIMMs from
the defective logic board and
install them on the
replacement logic board.
(See Hardware/Memory.)

Replacement Note:

The logic
boards of the various
models of the computer are
similar. Be sure to install
the correct board.

Replacement Note:

Position
the center rear edge of the
logic board in the plastic
bracket and slide the board
straight back.

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Service Source

Additional Procedures

Centris 650/Quadra 650

Additional Procedures Battery Verification - 1

Battery

Battery

Verification

Before you begin, remove
the top cover.

Warning:

discarded improperly, the
lithium battery could
explode. Review battery­handling and disposal
instructions in Bulletins/
Safety.

Caution:

precautions in Bulletins/
Safety.

If handled or

Review the ESD

Additional Procedures Battery Verification - 2

1 Set the voltmeter to the

10 volts DC scale.

2 Hold the positive probe

of the voltmeter to the

Negative
Probe

positive end of the
battery (marked “+”
on the logic board) and

Positive
Probe

the negative probe to the
negative end of the
battery.

3 If the battery voltage is

below 3.2 volts, replace
the battery. Refer to
“Battery Replacement”
in this chapter.

Additional Procedures Battery Replacement - 3

Battery

Battery

Replacement

Before you begin, remove
the top cover.

Warning:

discarded improperly, the
lithium battery could
explode. Review battery
handling and disposal
instructions in Bulletins/
Safety.

Caution:

precautions in Bulletins/
Safety.

If handled or

Review the ESD

Additional Procedures Battery Replacement - 4

1 Using a small flat-blade

screwdriver, pry open
the latch at the end of the
battery holder and lift
off the cover.

Additional Procedures Battery Replacement - 5

2 Grasp the battery and

remove it from the
holder.

3 Return the battery to

Apple for proper
disposal. For battery
packaging and labeling
instructions, refer to
the safety information in
Bulletins/Safety.

Additional Procedures Reset/Interrupt - 6

Reset/Interrupt

Before you begin, remove
the cover.

Reset/Interrupt

Switch

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Additional Procedures Reset/Interrupt - 7

1 With one finger, lift the

Reset/Interrupt Switch

center tab of the switch.

2 Gently lift the rear of

the switch up and away
from the front of the
case.

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Service Source

Upgrades

Centris 650/Quadra 650

Upgrades Expansion Cards - 1

Expansion Cards

Before you begin, remove
the cover.

NuBus Slots

Processor
Direct Slot

Caution:

precautions in Bulletins/
Safety.

Note:

Quadra 650 has two types of
expansion slots: three Nubus
slots and one processor
direct slot.

Pull up evenly on both sides
of an expansion card to avoid

Review the ESD

The Centris 650/

Upgrades Expansion Cards - 2

bending the connector pins.

Carefully grasp each end of
the card and pull straight up
to remove the card from the
expansion slot.

Replacement Caution:

replacing the card, do not
force it into the expansion
slot. If the card does not seat
properly, remove it and try
again.

When

Upgrades CD-ROM Drive Upgrade - 3

CD-ROM Drive Upgrade

Before you begin, remove

CD-ROM Drive

the top cover.

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Upgrades CD-ROM Drive Upgrade - 4

1 From the inside of the

top cover, squeeze in the
tabs of the blank bezel
and push out the bezel.

Blank Bezel

Tab

Upgrades CD-ROM Drive Upgrade - 5

2 Push in the slotted bezel.

Slotted Bezel

Upgrades CD-ROM Drive Upgrade - 6

3 Attach the CD-ROM drive

rails to the CD-ROM
drive.

4 Slide the CD-ROM drive

about three quarters of
the way into the drive
mount chassis.

CD-ROM
Drive Rail

CD-ROM Drive

CD-ROM

Drive Rail

Upgrades CD-ROM Drive Upgrade - 7

5 Connect these cables to

the CD-ROM drive:

• CD-ROM audio cable

• SCSI data cable

• SCSI power cable

Drive

CD-ROM

Audio Cable

SCSI Power

SCSI Data Cable

Cable

Upgrades CD-ROM Drive Upgrade - 8

6 Push the CD-ROM drive

completely into the CD­ROM slot until you hear
a click.

CD-ROM Drive

Upgrades Power Macintosh Card - 9

Power Macintosh Card

Before you begin, remove
the cover.

Caution:

precautions in Bulletins/
Safety.

Installing this card in the
computer’s Processor­Direct Slot (PDS),
upgrades this 68040
computer to a PowerPC
microprocessor–based
computer.

Review the ESD

Upgrades Power Macintosh Card - 10

For more information,
including installation
instructions, refer to the
Basics chapter in the Power
Macintosh Card manual.

Upgrades Power Macintosh Upgrade - 11

Power Macintosh Upgrade

No preliminary steps are
required before you begin
this procedure.

Upgrades Power Macintosh Upgrade - 12

The Centris 650 and Quadra
650 computers can be
upgraded to a Power
Macintosh 7100/66 or
Power Macintosh 7100/
66AV. For upgrade
instructions, refer to the
Upgrades chapter in the
Power Macintosh 7100
manual.

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Service Source

Exploded V ie w

Centris 650/Quadra 650

Exploded View 1

Exploded View

Floppy Drive Cable

922-0112

Floppy Drive Carrier

922-0763

Power Supply Strap

922-0906

Power Supply

661-0758

Internal Chassis

922-0058

CD-ROM Audio Cable

922-0842

Light Pipe

815-6272

Blank Bezel

922-1373

CD-ROM with

Caddy Bezel

922-0404

CD-ROM
Caddyless Bezel
922-0800

Front Panel
922-0542

Top Cover
922-0405

EMI Gasket
922-0887

Floppy Drive
661-0121
661-0474

* Hard Drive
Hard Drive Carrier

922-0066
Hard Drive

CD-ROM
SCSI Cable
922-0053

Power Cable
922-0051

CD-ROM Drive
922-0826

CD Carrier Rails
922-0067

* Logic Board

Speaker
922-0055

Bottom Case
922-0406

NuBus Access Cover

This is a generic representation of a product family. Configurations may vary.
For number of part with asterisk, see parts list.

810-6035