Apple Macintosh Quadra Centris 700 Service Manual

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Service Source

Macintosh IIcx/IIci/

Quadra 700

Macintosh IIcx

Macintosh IIci

Macintosh Quadra 700

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Service Source

Basics

Macintosh IIcx/IIci/Quadra 700

Basics Overview - 2

Overview

This manual includes
complete repair procedures
for the Macintosh IIcx,
Macintosh IIci, and Quadra
700, shown at left.

Figure: Macintosh IIcx, IIci, and Quadra 700

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SpeciÞcations

Macintosh IIcx/IIci/Quadra 700

Specifications Processor - 1

Processor

CPU

Macintosh IIcx

Macintosh IIci

Quadra 700

Addressing

Motorola 68030 microprocessor

15.6672 MHz

Motorola 68030 microprocessor
25 MHz

Motorola 68040 microprocessor
25 MHz

32-bit registers
32-bit address/data bus

Specifications Processor - 2

Coprocessor

Built-in floating-point unit (FPU)

Specifications Memory - 3

Memory

RAM

Macintosh IIcx

Macintosh IIci

Quadra 700

ROM

Macintosh IIcx

Macintosh IIci

1 MB, expandable to 128 MB (120 ns or faster SIMMs)

1 MB, expandable to 128 MB (80 ns or faster SIMMs)

4 MB, expandable to 8 MB (80 ns, I MB SIMMs) or 20 MB

(third-party 4 MB SIMMs)

256K

512K

Specifications Memory - 4

Quadra 700

1 MB soldered on logic board; ROM SIMM socket available

Specifications Disk Storage - 5

Disk Storage

Floppy Drive

Hard Drive

Macintosh IIcx/IIci

Quadra 700

Internal 1.4 MB floppy drive

Optional internal 40, 80, or 160 MB hard drive

Internal 80, 160, or 400 MB hard drive

Specifications I/O Interfaces - 6

I/O Interfaces

Floppy Drive

SCSI

Apple Desktop Bus

Serial

Expansion

Macintosh IIcx/IIci

Quadra 700

One DB-19 serial port for connecting external floppy drives

One DB-25 external connector

Two Apple Desktop Bus (ADB) ports

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

Three NuBus slots

Two NuBus slots and one processor-direct slot

Specifications I/O Interfaces - 7

Sound

Video

Macintosh IIci/ Quadra 700

Ethernet

Quadra 700

Stereo sound jack

One DB-15 video port for built-in video

Built-in Ethernet port; AUI-15 connector

Specifications I/O Devices - 8

I/O Devices

Keyboard

Mouse

Apple Keyboard

ADB mouse; DIN-4 connector

Specifications Sound and Video - 9

Sound and Video

Sound Generator

Video Display

Macintosh IIci/ Quadra 700

Apple sound chip provides 8-bit stereo sampling at 44.1 kHz
Four-voice, wavetable synthesis; capable of driving stereo

headphones or other stereo equipment through the sound jack

Supports 640 by 480 pixel screens at up to 256 colors or shades

of gray (up to 8 bits per pixel)

Supports 640 by 870 pixel screens at up to 16 shades of gray

Specifications Electrical - 10

Electrical

Line Voltage

Frequency

Maximum Power

Macintosh IIcx/IIci

Quadra 700

100Ð240 VAC, automatically configured

50Ð60 Hz, single phase

90 W (not including monitor power)

130 W (not including monitor power)
90 W continuous

Specifications Physical - 11

Physical

Dimensions

Weight

Height: 5.5 in. (14.0 cm)
Width: 11.9 in. (30.2 cm)
Depth: 14.4 in. (36.5 cm)

14 lb. (6.4 kg) with internal hard drive

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Troubleshooting

Macintosh IIcx/IIci/Quadra 700

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/System - 2

Symptom Charts

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. Retain customer’s SIMMs.

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

Troubleshooting Symptom Charts/System

(Continued)

- 3

System shuts down
intermittently

System
intermittently
crashes or locks

System

1 Make sure air vents on sides and top of case are

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 Make sure system software is correct version.
2 Make sure application software is known-good.
3 Replace SIMMs.
4 Replace logic board. Retain customer’s SIMMs.
5 Replace power supply.

(Continued)

unobstructed. Thermal protection circuitry may shut down

system. After 30–40 minutes, system should be OK.

Additional Procedures.

Troubleshooting Symptom Charts/Video - 4

Video

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

1 Adjust brightness on monitor.
2 Replace monitor. Refer to appropriate monitor manual to

troubleshoot defective monitor.
3 Replace video cable.
4 Move video card to different slot.
5 Replace video card.
6 Quadra 700: Replace VRAM SIMMs.
7 Macintosh IIcx/IIci: Make sure ROM jumper is on.
8 Replace SIMMs.
9 Replace logic board. Retain customer’s SIMMs.
10 Replace power supply.

Troubleshooting Symptom Charts/Video

(Continued)

- 5

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

Video

1 Replace video cable.
2 Replace monitor. Refer to appropriate monitor manual to

3 Quadra 700: Replace VRAM SIMMs.
4 Macintosh IIcx/IIci: Make sure ROM jumper is on.
5 Remove NuBus cards.
6 Remove peripherals.
7 Replace SIMMs.
8 Replace logic board. Retain customer’s SIMMs.
9 Replace power supply.

(Continued)

troubleshoot defective monitor.

Troubleshooting Symptom Charts/Video

(Continued)

- 6

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 Replace monitor. Refer to appropriate monitor manual to

2 Replace video cable.
3 Move video card to different slot.
4 Replace video card.
5 Replace logic board. Retain customer’s SIMMs.

1 Plug the monitor directly into a wall socket and verify that

2 Check battery. Refer to “Battery Verification” in Additional

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

(Continued)

troubleshoot defective monitor.

the monitor has power.

Procedures.

Troubleshooting Symptom Charts/Floppy Drive - 7

Floppy Drive

Audio and video
present, but internal
drive does not operate

Disk ejects; display
shows icon with
blinking “X”

1 Replace disk with known-good system disk.
2 Verify that all external SCSI devices are disconnected.
3 Replace internal floppy drive cable.
4 Replace internal floppy drive.
5 Replace logic board. Retain customer’s SIMMs.
6 Replace power supply.

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

Troubleshooting Symptom Charts/Floppy Drive

(Continued)

- 8

Floppy Drive

Will not eject disk 1 Switch off computer. Hold mouse button down while you

switch computer on.
2 Eject disk manually.
3 Replace floppy drive.

Attempts to eject
disk, but doesn’t

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

(Continued)