IBM thinkpad 390u schematic

Note: Before using this information and the product it supports, be sure to read the general information under

“Safety Information” on page viii, “Ergonomics Information” on page 38, and “Notices” on page 143.

First Edition (November 1998)

The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law:

INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE LIMITED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimers or express or implied warranties in certain transactions; therefore, this statement may not apply to you.

This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. IBM may make improvements or changes in the products or the programs described in this publication at any time.

Requests for technical information about IBM products should be made to your IBM Authorized Dealer or your IBM Marketing Representative.

 Copyright International Business Machines Corporation 1998. All rights reserved. Note to US Government Users — Documentation related to restricted rights — Use, duplication, or disclosure is subject to restrictions set forth in GSA ADP Schedule Contract with IBM Corp.

Thank You for Selecting an IBM ThinkPad 390 Computer

We at IBM have developed this ThinkPad computer to meet both your technical requirements and your high expec-

tations. To help us continue to build products that address your mobile computing needs, please take a moment to

complete the ThinkPad Registration.

 Copyright IBM Corporation 1998 iii

Functional Highlights

All-in-one design with core technology The well-balanced,

all-in-one design of the ThinkPad 390 brings ease-of-use to your computing needs.

High-speed processor The Intel high-speed processor enables

high-speed data processing and provides advanced performance.

Large-capacity hard disk drive The large-capacity hard disk drive

can respond to a wide variety of your business demands.

Large color LCD The large TFT (thin-film transistor) display provides

clear and brilliant text and graphics.

Nickel metal hydride or lithium-ion battery pack The large-

capacity battery pack extends the operating time of your computer, further enhancing its portability.

Audio with 3D Stereo Sound Your computer is equipped with

internal audio record and playback capabilities including 3D audio from just two speakers. When you enable the 3D stereo feature, sounds will appear to be generated all around you, even though only two speakers are used.

The audio feature supports the following:

 Wave audio recording and playback of up to 16 bits,

stereo, and 48 KHz sampling.

 DOS games using the Sound Blaster Pro** interface.

For more information on using the audio function Online User's Guide.

ThinkPad Modem The ThinkPad modem enables you to send or

receive data and faxes over a telephone line. For more information on using the ThinkPad modem

Online User's Guide.

TrackPoint with Enhanced Controls Your computer has an

enhanced TrackPoint function that enables you to make selections merely by pressing on the TrackPoint. A new

Functional Highlights

center button converts the TrackPoint into a scroll controlling device or a magnifying glass on the screen.

For more information on using the TrackPoint “TrackPoint” on page 9.

PC Card Support Your computer provides two PC Card slots that

accept a 16–bit PC Card, CardBus Card, and Zoomed Video Card.

For more information on installing PC Cards “Inserting a PC Card” on page 69.

About This Book

This book contains information that will help you operate the IBM ThinkPad 390 computer. Be sure to read the

Guide

and Chapter 1 of this book before using the computer.

ThinkPad 390 Setup

Appendix A, Features and Specifications describes the features and specifications associated with your computer, including information on power cords.

Appendix B, Product Warranties and Notices contains the warranty statements for your computer and notices for this book.

About This Book

The glossary defines terms appearing in this book. The book concludes with an index.

Icons Used in This Book

For procedures or information unique to the operating system installed in your computer:

Information for Microsoft Windows 98 users.

Information for Microsoft Windows NT users.

Information for Microsoft Windows 95 users.

Information for Microsoft Windows

3.11 users. Information for IBM DOS users.

Information for IBM Operating System/2 (OS/2) users.

vii

Safety Information

Electrical Safety Notice

Note: In the U.K., by law:

 The telephone line cable must be connected after the

power cord.

 The power cord must be disconnected after the telephone

line cable.

DANGER

Electrical current from power, telephone, and communication cables is hazardous. To avoid shock hazard, connect and disconnect cables as shown below when installing, moving, or opening the covers of this product or attached devices. The 3–pin power cord must be used with a properly grounded outlet.

viii

Safety Information

DANGER

Do not disassemble, incinerate, or short-circuit the rechargeable battery pack. Do not put it in trash that is disposed of in landfills. Dispose of it as required by local ordinances or regulations. In the United States, call IBM at 1-800-IBM-4333 for information on disposal.

Safety Information

CAUTION: The lithium battery (IBM P/N 02K6502 UL-recognized component—File No. MH12210) can be replaced only by your dealer or an IBM service representative. It contains lithium and can explode if not properly used, handled, or disposed of. Do not: (1) throw or immerse into water, (2) heat to more than 100°C (212°F), or (3) attempt to repair or disassemble. Dispose of it as required by local ordinances or regulations.

CAUTION: The fluorescent lamp in the liquid crystal display (LCD) contains mercury. Do not put it in trash that is disposed of in landfills. Dispose of it as required by local ordinances or regulations.

The LCD is made of glass, and rough handling or dropping the computer can cause the LCD to break. If the LCD breaks and the internal fluid gets into your eyes or on your hands, immediately wash the affected areas with water for at least 15 minutes; then get medical care if any symptoms are present after washing.

Laser Compliance Statement

The CD-ROM drive of the ThinkPad 390 computer is a laser product. The CD-ROM drive's classification label (shown below) is located on the top of the drive.

CLASS 1 LASER PRODUCT LASER KLASSE 1 LUOKAN 1 LASERLAITE APPAREIL A LASER DE CLASSE 1 KLASS 1 LASER APPARAT

The CD-ROM drive is certified in the U.S. to conform to the requirements of the Department of Health and Human Services 21 Code of Federal Regulations (DHHS 21 CFR) Subchapter J for Class 1 laser products.

In other countries, the drive is certified to conform to the requirements of EN60825.

Safety Information

CAUTION: Do not open the CD-ROM drive; no user adjustments or serviceable parts are inside.

Use of controls, adjustments, or the performance of procedures other than those specified may result in hazardous radiation exposure.

Class 1 laser products are not considered to be hazardous. The CD-ROM drive has an internal, Class 1, 0.5-milliwatt, aluminum gallium-arsenide laser that operates at a wavelength of 760 to 810 nanometers. The design of the laser system and the CD-ROM drive ensures that there is no exposure to laser radiation above a Class 1 level during normal operation, user maintenance, or servicing conditions.

xii

Contents

Thank You for Selecting an IBM ThinkPad 390 Computer . iii

Functional Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . iv

About This Book ............................ vi

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Electrical Safety Notice ...................... viii

Laser Compliance Statement ................... x

Chapter 1. Getting Familiar with Your Computer ....... 1

Identifying the Hardware Features .................. 2

Front View of the Computer .................... 2

Rear View of the Computer .................... 4

Bottom View of the Computer ................... 6

System Status Indicators ....................... 7

Distinctive Functions of Your Computer ............... 9

Keyboard Functions . . . . . . . . . . . . . . . . . . . . . . . . . 9

UltraBay FX . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

ThinkPad Utility Programs .................... 17

Online User's Guide ........................ 28

Backing Up Your System ...................... 30

ThinkPad Customization CD ................... 30

Recovery CD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Diskette Factory . . . . . . . . . . . . . . . . . . . . . . . . . . 30

ConfigSafe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

ThinkPad Web Site or Bulletin Board .............. 31

Replacing the Battery Pack ..................... 32

Handling Your Computer ...................... 33

ThinkPad Don'ts . . . . . . . . . . . . . . . . . . . . . . . . . . 33

ThinkPad Do's . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Cleaning Your Computer ..................... 35

Carrying the Computer ...................... 35

Preserving Battery Pack Life ................... 36

Maximizing Battery-Powered Operation ............ 36

Ruggedized Mobile Computers ................. 37

Ergonomics Information . . . . . . . . . . . . . . . . . . . . . 38

For More Information ....................... 40

 Copyright IBM Corporation 1998 xiii

Chapter 2. Extending the Features of Your Computer ... 41

Customizing the TrackPoint ..................... 42

Using the Press-to-Select Page ................. 43

Using the Sensitivity Page .................... 45

Using the Scrolling Page ..................... 46

Increasing Memory . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Upgrading the Hard Disk Drive ................... 52

Replacing the UltraBay FX Device ................. 54

Attaching an External Mouse, Keypad or Keyboard ....... 58

Attaching an External Mouse or Numeric Keypad ...... 58

Attaching an External Keyboard and Mouse .......... 61

Disabling the TrackPoint ..................... 62

Attaching an External Monitor ................... 63

Display Output Location ..................... 64

Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Attaching a Printer .......................... 68

Inserting a PC Card ......................... 69

Removing the PC Card ...................... 70

Using a Port Replicator ....................... 72

Enabling the CardBus Sockets (for Windows 98) ....... 73

xiv

Chapter 3. Protecting Your Computer ............. 75

Using Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Entering a Password ....................... 77

Setting a Password ........................ 78

Changing or Removing a Password .............. 79

Using Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Using the Security Screw ...................... 82

Chapter 4. Solving Computer Problems ............ 83

Frequently Asked Questions .................... 84

Hints, Tips and Limitations ..................... 91

Using a PC Card with the Port Replicator ........... 92

USB Connector Considerations ................. 92

Using a Second CardBus Card ................. 92

Using an External Condenser Microphone ........... 93

Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . 94

Troubleshooting Charts . . . . . . . . . . . . . . . . . . . . . . . 95

Error Codes or Messages .................... 96

No Error Codes or Messages .................. 97

Input Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Suspend or Hibernation Problems ............... 100

LCD Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Indicator Problems . . . . . . . . . . . . . . . . . . . . . . . . 103

Battery Problems . . . . . . . . . . . . . . . . . . . . . . . . . 103

CD-ROM Problems . . . . . . . . . . . . . . . . . . . . . . . . 104

Infrared Communication Problems ............... 105

Audio Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Universal Serial Bus (USB) Problems ............. 106

Modem Problems . . . . . . . . . . . . . . . . . . . . . . . . . 107

PC Card Problems ........................ 109

Printer Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 110

External Monitor Problems .................... 111

Port Replicator Problems ..................... 113

Other Option Problems ...................... 114

Software Problems . . . . . . . . . . . . . . . . . . . . . . . . 115

Other Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Recovering Lost or Damaged Software .............. 117

Using the Diskette Factory .................... 118

Using the ThinkPad Customization CD ............. 118

Using the Recovery CD ..................... 119

Chapter 5. Getting Service . . . . . . . . . . . . . . . . . . . . 121

Information on Your Computer ................... 122

Option List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Identification Numbers . . . . . . . . . . . . . . . . . . . . . . 122

Problem Recording Sheet .................... 123

Customer Support and Service ................... 124

Help by Telephone ........................ 124

ThinkPad EasyServ . . . . . . . . . . . . . . . . . . . . . . . . 125

Getting Help Around the World ................. 125

Fax Information . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Electronic Support Services ................... 126

Purchasing Additional Services ................... 128

Enhanced PC Support Line ................... 128

Client Support Line ........................ 129

Network and Server Support Line ................ 129

Ordering Support Line Services ................. 129

Warranty and Repair Services .................. 130

Obtaining IBM Operating System Updates ............ 131

Getting Update Diskettes ..................... 131

Ordering Publications . . . . . . . . . . . . . . . . . . . . . . . 131

Appendix A. Features and Specifications ........... 133

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

IBM Power Cords ........................... 138

Appendix B. Product Warranties and Notices ........ 139

Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Electronic Emission Notices ................... 144

Telecommunication Notice . . . . . . . . . . . . . . . . . . . . 145

Industry Canada Requirements ................. 147

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

xvi

Chapter 1. Getting Familiar with Your Computer

Identifying the Hardware Features .................. 2

Front View of the Computer .................... 2

Rear View of the Computer .................... 4

Bottom View of the Computer ................... 6

System Status Indicators ....................... 7

Distinctive Functions of Your Computer ............... 9

Keyboard Functions . . . . . . . . . . . . . . . . . . . . . . . . . 9

TrackPoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Fn Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Numeric Keypad . . . . . . . . . . . . . . . . . . . . . . . . 14

UltraBay FX . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

CD-ROM Drive . . . . . . . . . . . . . . . . . . . . . . . . . 15

ThinkPad Utility Programs .................... 17

BIOS Setup Utility ....................... 18

ThinkPad Configuration . . . . . . . . . . . . . . . . . . . . 26

Online User's Guide ........................ 28

Backing Up Your System ...................... 30

ThinkPad Customization CD ................... 30

Recovery CD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Diskette Factory . . . . . . . . . . . . . . . . . . . . . . . . . . 30

ConfigSafe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

ThinkPad Web Site or Bulletin Board .............. 31

Replacing the Battery Pack ..................... 32

Handling Your Computer ...................... 33

ThinkPad Don'ts . . . . . . . . . . . . . . . . . . . . . . . . . . 33

ThinkPad Do's . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Cleaning Your Computer ..................... 35

Carrying the Computer ...................... 35

Preserving Battery Pack Life ................... 36

Maximizing Battery-Powered Operation ............ 36

Creating the Hibernation Function .............. 37

Ruggedized Mobile Computers ................. 37

Ergonomics Information . . . . . . . . . . . . . . . . . . . . . 38

For More Information ....................... 40

 Copyright IBM Corporation 1998 1

Identifying the Hardware Features

Front View of the Computer

2 ThinkPad 390 User's Reference

Identifying the Hardware Features

(1) The LCD latches release the LCD when pressed and allow it to

be opened. (2) The color LCD screen displays computer output. (3) The built-in microphone captures sound and voice when it is

used with an application program capable of handling audio. (4) The brightness control adjusts the brightness of the display. (5)

(6)

(7)

(8)

(9) The PC Card slots accept PC Cards. (10) The PC Card eject buttons eject the PC Card from the PC Card

(11)

(12) The diskette drive (shown installed in the UltraBay FX). (13) The diskette-drive-activity indicator lights up when the computer

(14) The diskette-eject button ejects the diskette from the diskette

(15) The CD-ROM drive (shown installed in the UltraBay FX). (16) The CD-ROM access indicator is on when data is read from a

(17) The CD-ROM eject button ejects the CD-ROM tray . (18) The manual-eject hole is used to eject the CD-ROM tray when it

(19) The TrackPoint buttons work with the TrackPoint (20) and func-

(20) The TrackPoint is a built-in pointing device that provides a func-

(21) The Fn key is used with the function keys to activate the Fn key

(22) The indicator panel consists of the system-status indicators and

(23) The left and right internal speakers generate stereo sound.

The internal modem port is used for connecting your com-

puter to an analog telephone line.

The headphone jack, a ⅛inch (3.5mm) diameter jack, is where

you connect stereo headphones or external speakers.

The line-in jack, a ⅛inch (3.5mm) diameter jack, is where

you connect an external audio device.

The microphone jack, a ⅛inch (3.5mm) diameter jack, is

where you connect a self-powered stereo microphone.

Note: Do not plug any device into the microphone jack except a

microphone.

slot.

The audio volume control adjusts the volume of the

speakers.

is accessing the diskette drive.

drive.

CD-ROM in the CD-ROM drive.

does not open with the eject button.

tion similar to the buttons on a mouse.

tion similar to that of a mouse.

functions.

their associated symbols.

Chapter 1. Getting Familiar with Your Computer 3

Identifying the Hardware Features

Rear View of the Computer

(1) The battery pack is a built-in power source for the computer. (2)

(3) (4)

(5) (6)

(7)

(8) (9) To remove the hard disk (10), loosen this hard disk screw.

(10) The hard disk drive is the built-in mass storage device for the

(11)

The infrared port allows the computer to communicate with

other devices that have infrared data-transfer capability.

The power switch turns the computer on and off.

The universal serial bus (USB) allows you to connect any

device that conforms to the USB standard.

The power jack is where the AC Adapter cable is con-

nected.

The external-monitor connector is where you attach the

external monitor.

The serial connector is where you connect a 9–pin, serial-

device cable.

The security keyhole is used with a mechanical lock.

computer.

The parallel connector is where you connect a parallel-

printer signal cable.

4 ThinkPad 390 User's Reference

Identifying the Hardware Features

(12)

(13)

The external-input-device connector is used to attach a mouse, external keyboard, or external numeric keypad to the computer.

The battery status lamp shows the status of the battery

pack.

The suspend lamp lights when the computer is in suspend

mode.

Chapter 1. Getting Familiar with Your Computer 5

Identifying the Hardware Features

Bottom View of the Computer

(1) Flip out the tilt feet to tilt the computer to an angle for more com-

fortable use of your computer, especially when typing.

(2) The memory-slot cover covers the memory slot.

The two memory slots accepts dual inline memory module (DIMM) options.

Note: Base memory (32 MB or 64 MB) occupies one memory

slot. (3) The battery-pack latch locks or releases the battery pack. (4) When the bay LED is on, you should not remove the UltraBay FX

device.

(5) The UltraBay FX device lock locks or releases the UltraBay FX

device.

(6)

The system-expansion connector (240-pin) allows you to

connect the port replicator.

6 ThinkPad 390 User's Reference

System Status Indicators

The system-status indicators on the computer show the current status of your computer by their on or off states and colors (green and orange). Each indicator is identified with a symbol. The following shows the location and the meaning of each icon:

System Status Indicators

Chapter 1. Getting Familiar with Your Computer 7

System Status Indicators

Symbol Color Meaning

(1) Battery status Green Enough battery power remains for operation.

Blinking orange The battery pack needs to be charged Orange The battery pack is being charged.

(2) Suspend mode Green The computer is in suspend mode

Blinking green The computer is entering suspend mode.

(3) Drive in use Orange Data is being read from or written to the hard

disk, floppy drive, or data is being read from the CD-ROM drive. Do not enter suspend mode or power off the computer when this indicator is on.

(4) Numeric lock Green The numeric keypad on the keyboard is

enabled. You enable or disable the keypad by pressing and holding the Shift key, and pressing the NumLk key. For details, see “Numeric Keypad” on page 14.

(5) Caps lock Green Caps Lock mode is enabled. All alphabetic

characters without the Shift key being pressed. You enable or disable the Caps Lock mode by pressing the Caps Lock key.

(6) Scroll lock Green Scroll Lock mode is enabled. The Arrow keys

can be used as screen-scroll function keys. The cursor cannot be moved with the Arrow keys.

Not all application programs support this function.

pressing the ScrLk key.

(7) Power on Green The computer is operational. This indicator is on

when the computer is on and not in suspend mode.

(A-Z)

are entered in capital letters

You enable or disable Scroll Lock mode by

8 ThinkPad 390 User's Reference

Distinctive Functions of Your Computer

Your computer has unique keyboard functions and utility programs for easy configuration. This section includes the following topics:

 Keyboard functions  UltraBay FX  ThinkPad utilities

 Online User's Guide

Keyboard Functions

Your computer's keyboard has the following functions:  TrackPoint  Fn key  Numeric keypad

TrackPoint

The keyboard contains a unique cursor-pointing device called the

TrackPoint

single process you can perform without moving your fingers from their typing position.

The TrackPoint consists of a stick on the keyboard and three click buttons below the keyboard. Movement of the pointer on the screen is controlled by the amount of pressure you apply to the nonslip cap on the stick in any direction parallel to the keyboard; the stick itself does not move. The speed at which the pointer moves corresponds to the pressure you apply to the stick. The function of the click buttons depends on the software you are using.

. Pointing, selecting, and dragging all become part of a

Chapter 1. Getting Familiar with Your Computer 9

Distinctive Functions of Your Computer

If you are not familiar with using the TrackPoint, these instructions will help you get started:

1. Place your hands in the typing position and press gently with either index finger on the stick in the direction you want the cursor to move.

Pressing the stick away from you moves the cursor up the screen; pressing it toward you moves the cursor down the screen. You can also move the cursor side to side by pressing sideways.

Note: The cursor may drift. This is not a defect. Do not use the

TrackPoint until the cursor stops moving.

ThinkPad 390 User's Reference

Distinctive Functions of Your Computer

2. Press the click buttons with either thumb to select and drag as

required by your software.

Changing the Cap

The cap (1) on the end of the TrackPoint is removable. You can replace it with one of the spares shipped with your computer.

Chapter 1. Getting Familiar with Your Computer 11

Distinctive Functions of Your Computer

Fn Key

For more information on customizing the TrackPoint izing the TrackPoint” on page 42.

The Fn key function allows you to change operational features instantly. When you use the following functions, press and hold the

Fn key (1); then press the appropriate function key (2) (F1 to F12).

The Fn Key Lock Function

The following setup give you the same effect as when you press and hold the Fn key and then press an appropriate function key:

Start the ThinkPad Configuration program, (See “ThinkPad

“Custom-

Configuration” on page 26.) click on the Accessibility ( button, and click on Enable for Fn key lock.

once

After you enable the Fn key lock and press Fn of the function keys. The computer works the same as when you press Fn + the function key.

twice

If you press Fn key alone is recognized as a combination of Fn + that function key. To stop this function, press Fn again.

12 ThinkPad 390 User's Reference

after enabling the lock, pressing a function

, press one

)

The following table shows the function of the Fn key combined with keys:

Feature and Icon Key Combination Meaning

Power Mode Functions Fuel-Gauge

display on or off

Power mode switching

Fn+F2 (Only for Windows users)

Fn+F11 During battery power operation, the power mode changes

If you press this key combination, the window for the battery status appears or disappears. You can set parameters for battery status in the window.

Note: The Fuel-Gauge program must be activated before

as follows:

Distinctive Functions of Your Computer

you can use this key combination. To activate the Fuel-Gauge program, do the

following:

1. Click on Start.

2. Move the cursor to Programs, ThinkPad, and then click on Fuel-Gauge.

Power Conservation Functions for Battery Power Standby mode Fn+F3 The computer enters standby mode. For more information

about this mode

Suspend mode Fn+F4 The computer enters suspend mode. For more information

about this mode

Hibernation mode

Other Functions Switching

between the LCD and the external monitor

Chapter 1. Getting Familiar with Your Computer 13

Fn+F12 The computer enters hibernation mode. For more informa-

tion about this mode

Fn+F7 Computer output is displayed in the following order when

an external monitor

Online User's Guide

Distinctive Functions of Your Computer

Numeric Keypad

The keyboard has some keys that, when enabled, work as if they were on a 10-key numeric keypad. (The numeric keypad on the keyboard is not active when the external keyboard or the external numeric keypad is attached to the computer.)

To enable or disable the numeric keypad, press and hold Shift and then press NumLk.

If the numeric keypad is enabled, press and hold Shift to temporarily use the cursor- and screen-control keys.

Note: The functions of the cursor- and screen-control keys are not

printed on the keys.

14 ThinkPad 390 User's Reference

+ 146 hidden pages