Apple PowerBook Duo Dock Service Manual

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Service Source

PowerBook Duo Dock

PowerBook Duo Dock, PowerBook Duo Dock II,

PowerBook Duo Dock Plus

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Service Source

Basics

PowerBook Duo Dock

Basics System Overview - 1

System Overview

PowerBook Duo
System

The PowerBook Duo system
includes the following
products:

• PowerBook 200 Series
computer (PowerBook
Duo 210/230/250/

Duo Dock/

Duo Dock II/

Duo Dock Plus

Duo Floppy

Adapter

Duo MiniDock

Duo

210/230

250/270c

280/280c

270c/280/280c)

• PowerBook Duo Dock/Duo
Dock II/Duo Dock Plus

• PowerBook Duo MiniDock

• Floppy Adapter

Basics System Overview - 2

This manual includes
information about the Duo
Dock, Duo Dock II, and Duo
Dock Plus, shown at left.

For information about the
floppy adapter and the
PowerBook 200 Series
computers, refer to the
PowerBook 200 Series

Figure: PowerBook Duo Dock, Duo Dock II, Duo Dock Plus

manual. For information
about the Duo MiniDock,
refer to the PowerBook Duo
MiniDock manual.

Basics Repair Strategy - 3

Repair Strategy

Service the PowerDuo Dock, Duo Dock II, and Duo Dock Plus
through module exchange and parts replacement. Customers
can request on-site service from an Apple Authorized
Service Provider Plus (AASP+) Apple Assurance (US
only), or request a courier through the Apple Canada
Technical Answerline (Canada only). They can also choose
carry-in service from an AASP.

Ordering

Apple Service Providers planning to support the products
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 “Service Price Pages.”

Basics Repair Strategy - 4

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 - 5

Canadian Ordering

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

Basics Warranty/AppleCare/ARIS - 6

Warranty/AppleCare/ARIS

US Only

The PowerBook Duo Dock, Duo Dock II, and Duo Dock Plus
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 products. For pricing
information, refer to “Service Price Pages.”

Canada Only

The PowerBook Duo Dock, Duo Dock II, and Duo Dock Plus
are covered under first-year AppleCare. The Extended
AppleCare Service Plan is also available for these products.
Service Providers are reimbursed for first-year warranty
and Extended AppleCare repairs made to these products. For
pricing information, refer to “Service Price Pages.”

Basics Warranty/AppleCare/ARIS - 7

Duo Dock Configurations

The Duo Dock is available in standard and enhanced
configurations. The enhanced configuration includes:

• 230 MB hard drive

• Math coprocessor (68882 FPU chip at 25 MHz)

• 512K VRAM SIMM

• ADB Mouse II

Basics Warranty/AppleCare/ARIS - 8

These items are options for the standard configuration of the
original Duo Dock. See the Specifications chapter for more
information.

The Duo Dock II is available in this standard configuration:

• Math coprocessor (68882 FPU chip) at 33MHz

• On-board Ethernet

• 1 MB VRAM SIMM

• ADB Mouse II

The Duo Dock Plus has the same features as the Duo Dock II,
but without the FPU and cache.

Basics SCSI Devices - 9

SCSI Devices

SCSI ID Numbers

The PowerBook Duo Dock supports up to six SCSI devices. To
avoid conflicting SCSI ID numbers, assign external SCSI
devices numbers between 2 and 6. (The hard drive inside the
PowerBook Duo has SCSI ID number 0, and, if installed, the
hard drive inside the Duo Dock has ID number 1.)

Note:

You must use an HDI-30 SCSI system cable to connect

external SCSI devices to the Duo Dock.

Caution:

power to all devices in the chain.

When making SCSI connections, always switch off

Basics SCSI Devices - 10

SCSI Termination

The PowerBook Duo Dock has a built-in SCSI terminator.

To terminate a SCSI chain connected to the dock, attach one
external terminator only to the last device in the chain, or
connect a SCSI device with built-in termination as the last
device in the chain.

Note:

SCSI devices from other vendors may have built-in
terminators. If a SCSI device with a built-in terminator is
the last device in the chain, do not add an external
terminator to that device. If more than one SCSI device in the
chain has built-in terminators, you may need to remove the
extra internal terminators.

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Service Source

Specifications

PowerBook Duo Dock

Specifications Introduction - 1

Introduction

You can also find specifications information for this product 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

Coprocessor, Duo Dock

Coprocessor, Duo Dock II

Addressing

Motorola 68882 FPU chip (optional for standard Duo Dock)
25 MHz

Motorola 68882 FPU chip and 32K RAM cache
33 MHz

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

Specifications Memory - 3

Memory

ROM

VRAM Duo Dock

VRAM Duo Dock II/ Duo Dock Plus

Configuration ROM (differentiates between docking devices)

512K of VRAM soldered on logic board
512K VRAM SIMM (optional for standard Duo Dock)

I MB of VRAM soldered on logic board; no slot for additional VRAM

expansion

Specifications Disk Storage - 4

Disk Storage

Floppy Drive

Hard Drive, Duo Dock/Duo Dock II

Internal 1.4 MB floppy drive
SWIM II MFM/GCR disk controller chip

230 MB, 3.5 in., 1-in.-high SCSI hard drive (optional for Duo

Dock)

Internal 50-pin SCSI connector; external HDI-30 SCSI port

Specifications I/O Interfaces - 5

I/O Interfaces

Docking Connector

SCSI

Apple Desktop Bus

Internal 152-pin processor-direct slot (PDS) connector to

PowerBook

32-bit expansion bus

HDI-30 SCSI port with 1.5 MB/sec. transfer rate
Supports up to six external SCSI devices (five if drive is

installed)
Includes built-in terminator
Connection to another computer requires HDI-30 SCSI system

cable

Apple Desktop Bus (ADB) port (recommend maximum of three

low-speed, synchronous ADB devices); mini DIN-4 connector
200 mA maximum current draw for all ADB devices

Specifications I/O Interfaces - 6

Serial

NuBus

Ethernet

Sound

Video

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

Two internal NuBus slots
Two 15 W cards, or one each at 25 W and 5 W

One internal Ethernet port (on Duo Dock II/Duo Dock Plus only)

Monaural sound-in port (requires 20 dB attenuation cables and
adapters to accommodate audio equipment with line level outputs)
Monaural sound output jack for external audio amplifier

DB-15 connector supports Macintosh and some VGA monitors

(requires 15-pin-to-VGA adapter)

Specifications I/O Interfaces - 7

Modem

Pass-through telephone jack for optional internal (PowerBook)

modem
RJ-11 domestic; mini DIN-8 international

Specifications I/O Devices - 8

I/O Devices

Keyboard

Mouse

Microphone

Speaker

Apple Keyboard II
Apple Extended Keyboard

Apple Desktop Bus mouse
ADB Mouse II

External electret, omnidirectional microphone
Output voltage of 4 mV, peak to peak

16Ω magnetic, moving coil speaker

Specifications I/O Devices - 9

Video Support Duo Dock

Video Support Duo Dock II/Duo Dock Plus

512K of built-in video plus a 512K VRAM SIMM
Supports all Macintosh monitors up to 16-in. color
Supports VGA monitors (requires NuBus card)
1 MB of VRAM supports up to 32,000 colors

1 MB of on-board VRAM
Supports most Macintosh monitors (including Apple Multiple

Scan monitors) up to 21-in. color
Supports some VGA monitors
Includes Sync On Green feature

Specifications Electrical - 10

Electrical

Power Supply Duo Dock

Power Supply Duo Dock II/Duo Dock Plus

Universal AC power supply, 85–270 VAC
Provides 75 W continuous power, 85 W surge power
47–63 Hz, single phase input line frequency
Charges PowerBook Duo batteries and powers Duo Dock

Universal AC power supply, 90–270 VAC
Provides 75 W continuous power, 85 W surge power
47–63 Hz, single phase input line frequency
Charges PowerBook Duo batteries and powers Duo Dock I or II

Specifications Physical - 11

Physical

Dimensions Duo Dock

Dimensions Duo Dock II/Duo Dock Plus

Weight Duo Dock

Weight Duo Dock II/ Duo Dock Plus

Height: 4.75 in. (121 mm)
Width: 12.25 in. (311 mm)
Depth: 16.25 in. (413 mm)

Height: 6.22 in. (158 mm)
Width: 12.75 in. (323.8 mm)
Depth: 16.37 in. (415.6 mm)

13.1 lb. (5.95 kg) without hard drive; frame supports up to 60

lb.

15 lb. without hard drive; frame supports up to 85 lb.

Specifications Environmental - 12

Environmental

Operating Temperature Duo Dock

Operating Temperature Duo Dock II/Duo Dock Plus

Storage Temperature

Relative Humidity

50–104° F (10–40° C)

50–95° F (10–35° C)

-40 to 116° F (-40 to 47° C)

20–95% noncondensing

Specifications Environmental - 13

Altitude

0–15,000 ft. (0–4722 m)

Specifications Other - 14

Other

Modem

Docking Motor

Telephone line interface (DAA) circuitry (domestic)
Support for external telephone line interface (DAA) circuitry

(international)
RJ-11 connector (domestic); mini DIN-8 connector

(international)

Motorized injection/ejection mechanism draws the PowerBook

Duo system into the Duo Dock and ejects the system from the

Duo Dock
DC motor operates at 5 rpm and provides 16–30 lb. of pull-in

force

Specifications Other - 15

Security

Key locking device at left front of unit locks PowerBook Duo

computer into the Duo Dock
Each lock is unique (no master key is available); 125 key

combinations
Key codes will be released to locksmiths
Hook at rear of monitor stand can be used with Kensington

mechanism to lock Duo Dock to the desktop

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Service Source

Troubleshooting

PowerBook Duo Dock

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 Hard Drives May Not Spin Up - 2

Hard Drives May Not Spin Up

When inserted into a Duo Dock or Duo Dock II+, your PowerBook
200 Series computer may not start from its internal hard drive.

The conditions that can cause the problem include:

• The PowerBook 200 Series (Duo) computer and Duo Dock hard

drives have been formatted with different versions of HD SC

Setup.

• Enough VRAM is installed to allow the option of thousands of

colors when the PowerBook 200 Series computer is inside the

Dock (unless thousands of colors are selected, the problem does

not occur).

• 32-bit addressing is on.

It can also occur with an external hard drive connected to the
Dock, or if a third party drive is installed inside the Duo Dock or
Duo Dock II+. In this case, reformatting both the PowerBook 200

Troubleshooting Hard Drives May Not Spin Up - 3

Series computer and the Dock drives with the appropriate
formatter is required. Because Apple HD SC Setup does not
recognize third party drives, you need to use a third party
formatter.

To correct the problem, remove one of these conditions:

• Use HD SC Setup 7.2.2 or later to update the drivers on both

hard drives. This is available from authorized dealers or on-

line services.

• Reformat the Powerbook 200 Series computer’s hard drive

with Apple HD SC Setup 7.1, or reformat both the Duo’s

internal hard drive and the Dock’s hard drive with the same

version of HD SC Setup.

• Turn off 32-bit addressing.

• When starting up from the Dock, set the colors to 256 instead

of thousands.

Source: Info Alley, June 1995

Troubleshooting Symptom Charts/Startup - 4

Symptom Charts

Startup

RAM failure occurs
(eight-tone error
chord sequence
sounds after startup
chord)

1 Eject PowerBook Duo. Reboot and troubleshoot computer only.
2 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Startup - 5

Hardware failure
occurs (four-tone
error chord sequence
sounds after startup
chord)

1 Eject PowerBook Duo. Reboot and troubleshoot computer only.
2 Disconnect hard drive data cable, install standard Apple SCSI

terminator, and reboot system. If startup sequence is
normal, reseat cable, remove terminator, and retest. If
failure recurs, replace hard drive.

3 Disconnect floppy drive cable and reboot system. If startup

sequence is normal, reseat cable and retest. If hardware
failure recurs, replace floppy drive.

4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Power - 6

Power

System doesn’t
respond

System
intermittently
crashes or locks up

1 Eject PowerBook Duo. Reboot and troubleshoot computer only.
2 Check all Duo Dock logic board cable connections.
3 Replace Duo Dock power supply.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Make sure system software is 7.1 or higher.
2 Make sure software is known-good.
3 Eject PowerBook Duo. Reboot and troubleshoot computer only.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

5 Replace Duo Dock power supply.

Troubleshooting Symptom Charts/Power - 7

System doesn’t power
up, power supply
makes ticking sound,
and display has no
raster

1 Measure to see if voltages for pins 5 and 7 on the power

supply-to-logic board cable fall between the following
ranges:

• Pin 5 (yellow wire) 5V + or - .5V

• Pin 7 (blue wire) 20V + or - .5V

2 If voltages don’t fall within the above ranges, replace Duo

Dock power supply.

Troubleshooting Symptom Charts/Video - 8

Video

No external display,
but computer
appears to operate
correctly

1 Adjust screen contrast.
2 Reseat video cable.
3 Replace video cable.
4 Replace video interface card (if installed).
5 Replace VRAM SIMM (if installed).
6 Try known-good external display. If now OK, replace and

troubleshoot original display.

7 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Video - 9

Raster or video
display problems at
external monitor

1 Reseat video cable.
2 Replace video cable.
3 Replace video interface card (if installed).
4 Replace VRAM SIMM (if installed).
5 Try known-good external display. If now OK, replace and

troubleshoot original display.
6 Eject PowerBook Duo. Reboot and troubleshoot computer only.
7 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Floppy Drive - 10

Floppy Drive

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

Disk ejects while
booting; display
shows Mac icon with
blinking X

1 Try known-good floppy disk.
2 Check floppy drive cable connection.
3 Replace floppy drive cable.
4 Replace floppy drive.
5 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Try known-good system disk.
2 Verify that mouse button is not stuck.
3 Check floppy drive cable connection.
4 Replace floppy drive cable.
5 Replace floppy drive.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Floppy Drive - 11

Disk does not eject 1 Switch off system. To eject disk, hold mouse button down

while you switch system on.
2 Insert straightened paper clip into hole next to drive opening

and eject disk.
3 Check floppy drive cable connection.
4 Replace floppy drive cable.
5 Replace floppy drive.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Disk initialization
fails

1 Verify that you are using correct media.
2 Try known-good floppy disk.
3 Check floppy drive cable connection.
4 Replace floppy drive cable.
5 Replace floppy drive.

Troubleshooting Symptom Charts/Floppy Drive - 12

Read/write/copy
error

1 Verify that you are using correct media.
2 Try known-good floppy disk.
3 Check floppy drive cable connection.
4 Replace floppy drive cable.
5 Replace floppy drive.

Troubleshooting Symptom Charts/Hard Drive - 13

Hard Drive

Internal PowerBook
hard drive does not
operate

Internal Duo Dock
hard drive does not
operate

Eject PowerBook Duo. Reboot and troubleshoot computer only.

1 Check internal hard drive data cable connection.
2 Replace internal hard drive data cable.
3 Run Macintosh Hard Disk Test.
4 Use HD SC Setup to reinitialize drive.
5 Replace internal hard drive.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Hard Drive - 14

Internal hard drive
works, but external
SCSI device does not

Drive does not appear
on desktop

1 Make sure external devices have unique switch settings

between 2 and 6.
2 Make sure SCSI chain is terminated at last device only.
3 Replace external SCSI terminator.
4 Troubleshoot external SCSI device.

1 Restart system.
2 Verify that SCSI devices have unique addresses.
3 Use HD SC Setup to initialize drive.

Troubleshooting Symptom Charts/Peripherals - 15

Peripherals

Cursor does not
move, or moves
erratically

Cursor moves, but
clicking mouse
button has no effect

1 Simultaneously press <Command> <Control> <Power On> keys

to reset computer.
2 Check ADB connections.
3 Inspect and clean mouse, if necessary.
4 If mouse was connected to keyboard, try in ADB port. If OK,

replace keyboard.
5 Replace mouse.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Replace mouse.
2 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Peripherals - 16

No response to any
key on keyboard

Cannot double-click
to open application,
disk, or server

1 Press <Power On> key or power button.
2 Check keyboard cable connection.
3 Replace keyboard cable.
4 Replace keyboard.
5 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Remove any multiple system files.
2 Inspect and clean mouse, if necessary.
3 Clear parameter RAM and reset mouse controls. To clear

PRAM, start system, listen for boot tone, and immediately

depress <Option> <Command> <P> and <R> keys.
4 If mouse was connected to keyboard, try in ADB port. If OK,

replace keyboard.
5 Replace mouse.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Peripherals - 17

After you connect
external SCSI device,
computer doesn’t boot

Known-good
ImageWriter,
ImageWriter II, or
LQ does not print

1 Switch on external SCSI device before starting computer.
2 Check cable connections.
3 Verify that standard Apple terminator terminates SCSI chain.
4 Verify that SCSI select switch setting on external device is

unique.
5 Verify operation of internal hard drive.
6 Try known-good external SCSI device.
7 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Verify that System is 7.1 or later.
2 Verify that Chooser and Control Panel settings are correct.
3 Check cables.
4 Replace printer interface cable.
5 Try known-good printer.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Peripherals - 18

Known-good
LaserWriter does not
print

Device connected to
external modem port
doesn’t work

1 Verify that System is 7.1 or later.
2 Verify that Chooser and Control Panel settings are correct.
3 Check cables.
4 Replace printer interface cable.
5 Try known-good printer. If printer works, troubleshoot

network. Refer to Networks manual.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Verify that External Modem is selected in PowerBook Control

Panel.
2 Verify that System is 7.1 or later.
3 Check cables.
4 Test device with known-good computer.
5 Eject PowerBook and test device at PowerBook external

modem/printer port.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Peripherals - 19

I/O devices are
unrecognized or
garbage is
transmitted or
received

1 Verify that System is 7.1 or later.
2 Check cables.
3 Verify that SCSI devices are terminated properly.
4 Verify that SCSI select switch setting on external device is

unique between 2 and 6.
5 Test device with known-good computer.
6 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Internal Modem - 20

Internal Modem

Internal modem
options do not appear
in CDEV

1 Verify that System is 7.1 or later.
2 Remove and reseat modem interface board.
3 Eject PowerBook and test internal modem.
4 Replace modem interface board.
5 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Internal Modem - 21

Modem does not
respond properly to
AT command set
instructions

1 Verify that baud rate and data format settings of

communications application are compatible with internal

modem and remote modem.
2 Check phone cord connection and operation.
3 Verify that System is 7.1 or later.
4 Remove and reseat modem interface board.
5 Eject PowerBook and test internal modem.
6 Replace modem interface board.
7 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Internal Modem - 22

Strange mix of
characters appears
on screen

Modem interferes
with system sound

1 Verify that baud rate and data format settings of

communications application are compatible with internal

modem and remote modem.
2 Check phone cord connection and operation.
3 Verify that System is 7.1 or later.
4 Remove and reseat modem interface board.
5 Eject PowerBook and test internal modem.
6 Replace modem interface board.
7 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Remove and reseat modem interface board.
2 Eject PowerBook and test internal modem.
3 Replace modem interface board.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Internal Modem - 23

Modem does not
respond to incoming
call

Modem has no sound
output

Modem connects but
does not communicate
with remote modem

1 If computer is in sleep mode, verify that “Answer calls” is

selected in Remote Access Setup control panel.
2 Check phone cord connection and operation.
3 Eject PowerBook and test internal modem.
4 Replace modem interface board.
5 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Verify that Control Panel volume setting is 1 or higher.
2 Eject PowerBook and test internal modem.
3 Replace modem interface board.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Verify that remote modem needs error correction (error

correction is internal modem default).
2 Type AT &Q0 to disable error correction.

Troubleshooting Symptom Charts/Miscellaneous - 24

Miscellaneous

Can’t insert
computer into dock

Can’t eject computer
from dock

1 Unlock dock and insert computer.
2 Open I/O door on computer and insert computer.
3 Replace ejector assembly.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

1 Unlock dock and press eject button again.
2 If no power to dock, insert dock’s key or small screwdriver

into square hole on side of dock and press to manually eject

computer.
3 Replace ejector assembly.
4 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Troubleshooting Symptom Charts/Miscellaneous - 25

No sound from
speaker

Ejects computer
when you attempt to
start up from
keyboard

1 Verify that volume setting in Control Panel is 1 or above.
2 Check speaker-to-logic board cable connection.
3 Replace Duo Dock logic board. Retain VRAM SIMM, math

coprocessor, and SCSI terminator.

Shut down PowerBook and insert again.

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Service Source

T ak e Apart

PowerBook Duo Dock

Take Apart Cover - 1

Cover

Before you begin,

• Shut down unit

• Eject PowerBook Duo

• Disconnect cables

1 Pinch the cover at the

horizontal grooves

Cover

inside the front of the
cover and raise the cover
to a 45-degree angle.

Take Apart Cover - 2

2 Lift the cover straight

up and remove it from
the base.

Cover

Base

Take Apart Cover - 3

Replacement Note:

When replacing the
cover, first place the
notches at the back
corners of the cover
into notches at the raised
corners of the base.

Take Apart Release Mechanism - 4

Release Mechanism

Release Mechanism

Before you begin, remove
the cover.

Note:

The following tools
are required to disassemble
the PowerBook Duo Dock:

• Small flat-blade

screwdriver

• #2 crosstip screwdriver

Take Apart Release Mechanism - 5

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Release Mechanism - 6

1 Using a small, flat-blade

screwdriver, release the
latch and disconnect the
two-wire motor cable
from connector J18.

J18 Connector

Latch

2 Remove the four long

screws that secure the
release mechanism to the
logic board.

Take Apart Release Mechanism - 7

3 Raise the motor end of

Release Mechanism

the release mechanism
and pull the mechanism
out of the subassembly.

Subassembly

Take Apart Subassembly - 8

Subassembly

Latch

J11 Connector

Subassembly

Before you begin, remove
the following:

• Cover

• Release mechanism

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

1 Release the latch and

The PowerBook

disconnect the power
supply cable from
connector J11.

Take Apart Subassembly - 9

Subassembly

Base

2 Using a small flat-blade

screwdriver, loosen the
two captive screws that
secure the subassembly
to the base.

3

Note:

If you can’t pull
back the subassembly,
further loosen the two
captive screws that
secure the subassembly
to the base.

Pull the subassembly
back slightly until it
stops.

Take Apart Subassembly - 10

Base

Subassembly

4 Clear room on the

workbench pad beside
the base.

5 Lift the subassembly

straight up and remove
it from the base. Place
the subassembly beside
the base.

Take Apart Subassembly - 11

Note:

If you are
replacing a damaged
subassembly, first
remove the logic board,
floppy drive, hard drive
(if installed), ejector,
and speaker from the
subassembly. Refer to
the take-apart
procedures that follow.

Take Apart Logic Board - 12

Logic Board

Logic Board

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

• Modem interface card (if
installed)

Take Apart Logic Board - 13

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Logic Board - 14

1 If installed, disconnect

these cable connectors
from the logic board:

• Power supply cable
from J11

J8

• Floppy drive cable
from J13

• Speaker cable from
J15

J11

• Hard drive power
cable from J14

J13

• Eject mechanism
cable from J17

J17

J15

J14

• Hard drive data cable
from J8

Take Apart Logic Board - 15

Note:

You must first
release latches on the
power supply, speaker,
and eject mechanism
cables to disconnect them
from the logic board
connectors.

Take Apart Logic Board - 16

2 Remove the two

remaining logic board
mounting screws.

Logic Board

3 Raise the rear of the

logic board and pull it
out until the PDS
connector clears the
subassembly. Carefully
lift the logic board with
connected NuBus adapter
straight out of the
subassembly.

PDS Connector

Subassembly

Take Apart Logic Board - 17

Note:

If you are returning a
defective logic board to
Apple, be sure to disconnect
the NuBus adapter card (see
the next topic). Also remove
the internal SCSI
terminator, VRAM SIMM,

Extraction
Tool

math coprocessor, and
modem interface card (if

Math

Coprocessor

(Optional)

SCSI
Terminator

installed). Install these
parts on the replacement
logic board.

Take Apart Logic Board - 18

Note:

To remove the
optional math coprocessor
from the original Duo Dock,
use the VGC IC extraction
tool (P/N 076-0264).
Insert the tongs of the
extraction tool into the
slotted corners of the chip,
and gently squeeze the
handle.

Take Apart Logic Board - 19

J12 Connector

EMI Shield

Mounting Channel

Adapter Card

Replacement Note:

When
replacing the logic board,
make sure the NuBus
adapter card is properly
connected to connector J12
and the bottom edge of the
adapter card is in the
mounting channel beneath
the chassis.

Replacement Note:

All Duo
Dock logic boards should
include an EMI shield over
the video port. If necessary,
install the EMI shield on the
logic board. Extra EMI
shields can be ordered from
the Price Pages.

Take Apart NuBus Adapter Card - 20

NuBus Adapter Card

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

• Modem interface card (if

installed)

• Logic board

NuBus Adapter Card

Take Apart NuBus Adapter Card - 21

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart NuBus Adapter Card - 22

Gently rock the NuBus
adapter card from side to
side and disconnect it from
logic board connector J12.

J12 Connector

NuBus Adapter Card

Take Apart Floppy Drive - 23

Floppy Drive

Floppy Drive

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Floppy Drive - 24

1 Turn over the

subassembly and place
it on the workbench pad

NuBus Card Guide

Floppy Drive Cable

with the floppy drive up.

2 Pull out the plastic

NuBus adapter card
guide.

3 Disconnect the floppy

drive cable connector.

Subassembly

Take Apart Floppy Drive - 25

4 Pull out the two rear

mounting latches and
slightly lift the rear of

Floppy Drive

the floppy drive.

5 Pull out the two front

latches and remove the
floppy drive from the
subassembly.

Floppy Disk Slot

Replacement Note:

When replacing the
floppy drive in the
subassembly mount,
first lower the inject/
eject mechanism into the
floppy disk slot and then
push the drive down
until it latches.

Take Apart Floppy Drive - 26

Note:

If you need to replace

a defective floppy drive

Floppy Drive Cable

cable, be sure to note how
the cable is routed in the
subassembly before
removing the cable from the
cable clamp.

Clamp

Take Apart Ejector - 27

Ejector

Before you begin, remove
the following:

• Cover

Ejector

• Release mechanism

• Subassembly

• Floppy drive

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Ejector - 28

1 Release the latch and

disconnect the ejector
cable from connector
J17.

2 Pry open the cable clamp

and remove the ejector
cable.

J17 Connector

Ejector Cable

Cable Clamp

Take Apart Ejector - 29

3 Push down on the flat

surface of the ferrite
bead and pull open the
two halves of the bead.
Remove the ferrite bead
from the ejector cable.

Ferrite Bead

Take Apart Ejector - 30

4 Turn over the

subassembly and place
it on the workbench pad.

5 Unlace the ejector cable

from the subassembly.
Remove the ejector
from the mounting
bracket on the outside

Ejector

Cable

Mounting
Bracket

Subassembly

Ejector

edge of the subassembly.

Take Apart Speaker - 31

Speaker

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

• Floppy drive

Speaker

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Speaker - 32

1 Release the latch and

disconnect the speaker
cable from connector
J15.

2 Pry open the cable clamp

and remove the speaker
cable.

J15 Connector

Speaker Cable

Cable Clamp

Take Apart Speaker - 33

Cable Clamp

Speaker

3 Turn over the

subassembly and place
it on the workbench pad.

4 Remove the speaker

cable from the
subassembly cable
clamps.

5 Using a small flat-blade

screwdriver, pry the
speaker off the outside
edge of the subassembly.

Take Apart Power Supply - 34

Power Supply

Power Supply

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Take Apart Power Supply - 35

1 Depress the two plastic

latches and push in the
power supply at the
receptacle.

2 Remove the power

supply from the base.

Power Supply

Base

Take Apart Power Supply - 36

Mounting Tabs

Rear

Panel

Power Supply Cutouts

Replacement Note:

When
replacing the power supply,
you must first hook the
cutouts in the bottom of the
power supply over the
three mounting tabs in the
base. Then firmly push the
power supply toward the
rear panel until the power
supply latches into place.

Take Apart Lock Plug Assembly - 37

Lock Plug

Lock Plug Assembly

Locking Clip

Lock Plug
Assembly

Before you begin, remove
the following:

• Cover

• Release mechanism

• Subassembly

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

1 Pull the locking clip off

The PowerBook

the end of the lock plug.

Take Apart Lock Plug Assembly - 38

2 Push the lock plug out of

the base.

Take Apart Base - 39

Base

Base

To access the base, remove
the following:

• Cover

• Release mechanism

• Subassembly

• Power supply

K

Service Source

Upgrades

PowerBook Duo Dock

Upgrades VRAM Upgrade - 1

VRAM Upgrade

VRAM SIMM

Duo Dock (only)

Before you begin, remove
the cover.

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Upgrades VRAM Upgrade - 2

Note:

The PowerBook Duo
Dock has 512K of video RAM
soldered on the logic board.
You can increase the amount
of VRAM to 1 MB by
installing a 512K VRAM
SIMM in the SIMM slot
(connector J9). Use only
100 ns or faster VRAM
SIMMs.

Note:

You cannot increase
the amount of video RAM on
the Duo Dock II, which
comes with 1 MB VRAM.

Upgrades VRAM Upgrade - 3

1 Grasp the VRAM SIMM

by its edges with the

VRAM SIMM

contacts pointing down.
Insert the SIMM at an
angle into SIMM slot J9.

2 Push back on the SIMM

until it snaps into place.

J9 SIMM Slot

Upgrades Math Coprocessor - 4

Math Coprocessor

Before you begin, remove

Duo Dock (only)

Math Coprocessor

the cover.

Caution:

Duo Dock contains CMOS
devices that are very
susceptible to ESD damage.
Review the ESD precautions
in Bulletins/Safety.

The PowerBook

Upgrades Math Coprocessor - 5

Note:

You can add a Motorola
68882 math coprocessor to
the logic board of the
original Duo Dock, thereby
increasing the overall
performance of the
Macintosh Duo System.

Note:

The Duo Dock II
includes a math coprocessor
and therefore does not need
this upgrade.