Toshiba M40X Maintenance Manual

Toshiba Personal Computer

Satellite M40X

Maintenance Manual

TOSHIBA CORPORATION

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© 2004 by Toshiba Corporation. All rights reserved. Under the copyright laws, this manual cannot be reproduced in any form without the prior written permission of Toshiba. No patent liability is assumed with respect to the use of the information contained herein.

Toshiba Personal Computer Satellite M40X Maintenance Manual

First edition September 2004

Disclaimer

The information presented in this manual has been reviewed and validated for accuracy. The included set of instructions and descriptions are accurate for the M40X Series at the time of this manual's production. However, succeeding computers and manuals are subject to change without notice. Therefore, Toshiba assumes no liability for damages incurred directly or indirectly from errors, omissions, or discrepancies between any succeeding product and this manual.

Trademarks

IBM is a registered trademark, and OS/2 and PS/2 are trademarks of IBM Corporation. Microsoft, MS-DOS, Windows, DirectSound and DirectMusic are registered trademarks of Microsoft Corporation. Intel and Pentium are registered trademarks, and SpeedStep is a trademark of Intel Corporation. Sound Blaster is a registered trademark of Creative Technology Ltd. Centronics is a registered trademark of Centronics Data Computer Corporation. Photo CD is a trademark of Eastman Kodak. All other properties are trademarks or registered trademarks of their respective holders.

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Satellite M40X Maintenance Manual

Preface

This maintenance manual describes how to perform hardware service maintenance for the Toshiba Personal Computer Satellite SATELLITE M40X, referred to as the M40X Series in this manual.

The procedures described in this manual are intended to help service technicians isolate faulty Field Replaceable Units (FRUs) and replace them in the field.

SAFETY PRECAUTIONS

Four types of messages are used in this manual to bring important information to your attention. Each of these messages will be italicized and identified as shown below.

DANGER: “Danger” indicates the existence of a hazard that could result in death or serious bodily injury if the safety instruction is not observed.

WARNING: “Warning” indicates the existence of a hazard that could result in bodily injury if the safety instruction is not observed.

CAUTION: “Caution” indicates the existence of a hazard that could result in property damage if the safety instruction is not observed.

NOTE: “Note” contains general information that relates to your safe maintenance service.

Improper repair of the computer may result in safety hazards. Toshiba requires service technicians and authorized dealers or service providers to ensure the following safety precautions are adhered to strictly.

 Be sure to fasten screws securely with the right screwdriver. If a screw is not fully

fastened, it could come loose, creating a danger of a short circuit, which could cause overheating, smoke or fire.

 If you replace the battery pack or RTC battery, be sure to use only the same model battery

or an equivalent battery recommended by Toshiba. Installation of the wrong battery can cause the battery to explode.

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The manual is divided into the following parts:

Chapter 1 Hardware Overview describes the M40X Series system unit and each

FRU.

Chapter 2 Troubleshooting Procedures explains how to diagnose and resolve FRU

problems.

Chapter 3 Test and Diagnostics describes how to perform test and diagnostic

operations for maintenance service.

Chapter 4 Replacement Procedures describes the removal and replacement of the

FRUs.

Appendices The appendices describe the following:

 Handling the LCD module  Board layout  Pin assignments  Keyboard scan/character codes  Key layout  Screw torque list  Reliability

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Satellite M40X Maintenance Manual

Conventions

This manual uses the following formats to describe, identify, and highlight terms and operating procedures.

Acronyms

On the first appearance and whenever necessary for clarification acronyms are enclosed in parentheses following their definition. For example:

Read Only Memory (ROM)

Keys

Keys are used in the text to describe many operations. The key top symbol as it appears on the keyboard is printed in boldface type.

Key operation

Some operations require you to simultaneously use two or more keys. We identify such

operations by the key top symbols separated by a plus (+) sign. For example, Ctrl + Pause (Break) means you must hold down Ctrl and at the same time press Pause (Break). If three

keys are used, hold down the first two and at the same time press the third.

User input

Text that you are instructed to type in is shown in the boldface type below:

DISKCOPY A: B:

The display

Text generated by the computer that appears on its display is presented in the type face below:

Format complete System transferred

Satellite M40X Maintenance Manual

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Satellite M40X Maintenance Manual

Chapter 1 Hardware Overview

1.1 Features............................................................................................................................ 1-1

1.2 System Unit...................................................................................................................... 1-5

1.3 2.5-inch Hard Disk Drive................................................................................................. 1-9

1.4 Removable Drives.......................................................................................................... 1-10

1.5 Power Supply ................................................................................................................. 1-16

1.6 Batteries ......................................................................................................................... 1-18

Chapter 2 Troubleshooting Procedures

2.1 Troubleshooting Introduction .......................................................................................... 2-1

2.2 Troubleshooting Flowchart.............................................................................................. 2-2

2.3 Power Supply Troubleshooting ....................................................................................... 2-7

2.4 Display Troubleshooting................................................................................................ 2-12

2.5 Keyboard Troubleshooting ............................................................................................ 2-15

2.6 External USB Devices Troubleshooting........................................................................ 2-17

2.7 TV-Out Failure Troubleshooting ................................................................................... 2-19

2.8 Printer Port Troubleshooting ......................................................................................... 2-21

2.9 TouchPad Troubleshooting............................................................................................ 2-23

2.10 Speaker Troubleshooting ............................................................................................... 2-25

2.11 Optical Drive Troubleshooting ...................................................................................... 2-27

2.12 Modem Troubleshooting................................................................................................ 2-30

2.13 PCMCIA Troubleshooting............................................................................................. 2-32

2.14 IEEE 1394 Troubleshooting .......................................................................................... 2-34

2.15 Wireless LAN Troubleshooting..................................................................................... 2-36

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Chapter 3 Tests and Diagnostics

3.1 The Diagnostic Test .........................................................................................................3-1

3.2 Executing the Diagnostic Test..........................................................................................3-2

3.3 Config Check Test............................................................................................................3-6

3.4 DMI Check Test ...............................................................................................................3-7

3.5 PIO Loopback Test...........................................................................................................3-8

3.6 IEEE 1394 Test ................................................................................................................3-9

3.7 Speaker Audio Test ........................................................................................................3-10

3.8 Fan ON/OFF Test...........................................................................................................3-11

3.9 Main Battery Charge Test ..............................................................................................3-12

3.10 FDD Test ........................................................................................................................3-13

3.11 CD-ROM Test ................................................................................................................3-14

3.12 Keyboard Test ................................................................................................................3-15

3.13 Mouse (Pad) Test ...........................................................................................................3-17

3.14 LCD Pixels Mode Test...................................................................................................3-19

3.15 Lid Switch Test ..............................................................................................................3-20

3.16 HDD R/W Test...............................................................................................................3-21

3.17 LAN Test........................................................................................................................3-23

3.18 RTC Test ........................................................................................................................3-25

3.19 CD Control Button Test .................................................................................................3-26

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Satellite M40X Maintenance Manual

Chapter 4 Replacement Procedures

4.1 General............................................................................................................................. 4-1

4.2 Battery.............................................................................................................................. 4-7

4.3 PC Card............................................................................................................................ 4-9

4.4 HDD............................................................................................................................... 4-11

4.5 Optical Drive Module .................................................................................................... 4-13

4.6 Optical Drive.................................................................................................................. 4-15

4.7 Wireless LAN Unit ........................................................................................................ 4-17

4.8 Expansion Memory........................................................................................................ 4-20

4.9 Keyboard........................................................................................................................4-23

4.10 Modem ........................................................................................................................... 4-26

4.11 Display Assembly .......................................................................................................... 4-28

4.12 Touch Cover................................................................................................................... 4-31

4.13 Touch Pad ...................................................................................................................... 4-34

4.14 Speakers ......................................................................................................................... 4-36

4.15 System Board................................................................................................................. 4-37

4.16 Fan, Heat Sink, & CPU.................................................................................................. 4-39

4.17 Display Mask ................................................................................................................. 4-42

4.18 LCD Module .................................................................................................................. 4-44

4.19 FL Inverter Board .......................................................................................................... 4-47

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Appendices

Appendix A Handling the LCD Module..................................................................................A-1

Appendix B Board Layout ....................................................................................................... B-1

Appendix C Pin Assignments ..................................................................................................C-1

Appendix D Keyboard Scan/Character Codes......................................................................... D-1

Appendix E Key Layout .......................................................................................................... E-1

Appendix F Series Screw Torque List .................................................................................... F-1

Appendix G Reliability ............................................................................................................G-1

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Satellite M40X Maintenance Manual

Chapter 1

Hardware Overview

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1 Hardware Overview

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Satellite M40X Maintenance Manual

1 Hardware Overview

Chapter 1 Contents

1.1 Features...................................................................................................................... 1-5

1.2 System Unit................................................................................................................ 1-9

1.3 2.5-inch Hard Disk Drive......................................................................................... 1-11

1.4 DVD Super Multi..................................................................................................... 1-12

1.5 DVD Super Multi Double Layer.............................................................................. 1-14

1.6 DVD-ROM & CD-RW............................................................................................ 1-12

1.7 Power Supply ........................................................................................................... 1-15

1.8 Batteries ................................................................................................................... 1-17

1.8.1 Main Battery.............................................................................................. 1-18

1.8.2 RTC battery ............................................................................................... 1-19

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1 Hardware Overview

Figures

Figure 1-1 2.5-inch HDD .............................................................................................. 1-11

Table

Table 1-1 2.5-inch HDD specifications ....................................................................... 1-11

Table 1- 2 DVD-ROM & CD-RW drive specifications ............................................... 1-12

Table 1- 3 DVD Super Multi drive specifications........................................................ 1-13

Table 1- 4 DVD Super Multi Double Layer drive specifications................................. 1-14

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Satellite M40X Maintenance Manual

1.1 Features 1 Hardware Overview

1.1 Features

The Satellite EAL30 Series Personal Computer uses extensive Large Scale Integration (LSI), and Complementary Metal-Oxide Semiconductor (CMOS) technology extensively to provide compact size, minimum weight and high reliability. This computer incorporates the following features and benefits:

 CPU

• Intel Pentium-M Dothan 1.6GMHz, 1.73GMHz, 1.86MHz, 2.0GMHz, 2.13GMHz

and 2.26MHz

• Intel Celeron-M Dothan 1.3GMHz, 1.4GMHz, 1.5MHz, 1.6GMHz

• FCPGA CPU

 Chipset

• Intel 915PM/915GM/910GML chipset for system memory controller.

• Intel ICH6-M for PCI to LPC Bridge, PCI IDE controller, Power Management

Logic.

• ENE KB910 for Keyboard Controller, Battery management Unit, and RTC.

• TI PCI7411/PCI4510R for Card Bus PCMCIA, 1394a and 6in1 Card Reader

controller.

• ATI M24P/M22P/M24C for VGA controller.

• ALC250 for AC97 CODEC.

• SMC LPC47N217 for FIR and Parallel Port controller.

• Realtek RTL8100CL LAN controller

 Memory

• No on board memory.

• On board with two 200-pin +2.5V SO-DIMM connector, supporting, DDR

memories card. Maximum upgradeable to 2GB by two 1GB SO-DIMM module.

• 1 M/2MB L2 Cache on Celeron-M Dothan/Pentium-M Dothan.

 BIOS

• MB Flash ROM for system BIOS.

• Suspend to RAM/Disk.

• Password protection (System).

• Windows 98 ready with PnP

• Various hot key for system control.

• Refreshable

• Complete ACPI 1.0B Function

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1 Hardware Overview 1.1 Features

 Power

• 8cells of LI-ION 4300mAH 18650 size, battery Pack with 63.6WH capacity

• 4 Hrs charging time to 100% capacity on 4300mAH LI-ION Battery

(System off or Suspend)

 HDD

• 9.5mm, 2.5" HDD up to 120 GB

• Bus Master IDE

• 9.5m/m, 2.5”HDD Support

• Support Ultra 100 synchronous DMA

 Fixed Device Drivers

• 5.25” 12.7mm height, DVD-ROM & CD-RW combo device

• 5.25” 12.7mm height,DVD Super-multi device

 Optional Devices

• 256/512/1024MB SO-DIMM DDR modules

• Li-ION Battery Pack

• MINI PCI Wireless module

• MDC Modem module

 Keyboard

The computer's keyboard layouts are compatible with a 101/102-key enhanced keyboard. There are five types of keys: typewriter keys, keypad overlay, function keys, soft keys and cursor control keys. The typewriter keys and keypad overlay keys are gray. The other keys are dark gray.

 TouchPad

This pointing control device, located in the center of the keyboard palm-rest, provides convenient control of the cursor without requiring desk space for a mouse. The TouchPad incorporates two mouse buttons.

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Satellite M40X Maintenance Manual

1.1 Features 1 Hardware Overview

 Display

• 15.4” TFT screen with a resolution of 1280 horizontal x 800 vertical pixels WXGA

CSV

• 15.4” TFT screen with a resolution of 1280 horizontal x 800 vertical pixels WXGA

HCSV

• 15.0” TFT screen with a resolution of 1024 horizontal x 768 vertical pixels XGA

 I/O Ports

• One 25 pins Parallel port, EPP/ECP Capability

• One 15 pins CRT port, Support DDC 2B

• One 4 pins TV out port

• One MIC/Mono In port

• One headphone-out

• One DC-in Jack

• One type II PCMCIA Card Bus slots

• Three 4 pins USB ports

• One RJ11/RJ45 Port

• FIR

• One 1394a Port

• One 6 in 1 memory card accessory port. Support xD picture card, SM, MS, MS-Pro,

MMC and SD.

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1 Hardware Overview 1.1 Features

 PCMCIA Card Organization

• One type II card sockets

• 1.8" 10.5mm removable ATA Device

• Card bus card or PC Care with hot insertion and removal

• ACPI 1.1 Compliant.

• Support 5V/3.3V PC Cards and 3.3V Cardbus cards.

• Supports PCMCIA-ATA Specification.

 Multiple Digital Media Card Slot

• TI PCI4510R Card Bus PCMCIA control or TI PCI7411 Card Bus PCMCIA

control

• Support xD, SD, SM, MS, MS Pro and MMC

 Universal Serial Bus (USB)

The computer has three Universal Serial Bus (USB) ports that comply with the USB 2.0 standard, which enable data transfer speeds more than 40 times faster than USB 1.1 (which this computer also supports.) The USB drives may be used to transfer data at Low, Full, and high speeds.

 Parallel port

• Standard Mode IBM PC /XT, PC/AT, and PS/2 Compatible Bidirectional Parallel

Port

• Enhanced Parallel Port (EPP) Compatible- EPP1.7 and EPP1.9 (IEEE1284

Compliant)

 External monitor port

A 15-pin CRT port supporting DDC 2B enables connection of an external monitor, which is recognized automatically by Video Electronics Standards Association (VESA) Display Data Channel (DDC) compatible functions.

 Sound system

Windows® Operating System compatible sound system provides internal speakers as well as jacks for an external microphone and headphone.

 TV-out port

This video-out mini-jack enables transfer of NTSC or PAL data (video and right/left audio) to external devices such as a TV.

 LAN port

The computer comes with an RJ-45 Local Area Network (LAN) port. The LAN port provides connectivity for LAN.

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Satellite M40X Maintenance Manual

1.2 System Unit 1 Hardware Overview

1.2 System Unit

The system unit is composed of the following major components:

 Processor

• Depending on the model you purchased: Mobile Intel® Celeron® M Processor

350J/360J/370/380 or

• Intel® Pentium® M Processor 730/740/750/760/770/780

 System Logic

• Intel 915PM/915GM and 910GML Host Bridge/controller processor host Bus

support

• Integrated DRAM controller

• Integrated VGA controller(915GM and 915GML only)

• Support PCI-Express Graphic 16X x 1(915PM only)

• Intel ICH6-M for PCI to LPC Bridge, PCI IDE controller, Power Management

Logic.

• PCI bus Interface

• Power Management Functions

• Supports DMI

• Support PCI-E 1X x 4 or PCI-E 2X x 2 or PCI-E 4X x 1

•

 Keyboard Controller

• ENE KB910 is use as Keyboard Controller and Battery management unit.

 Memory

• Slot: 1 SO-DIMM up to 1GB can be upgraded through memory expansion slot.

You need to remove existing SO-DIMM if SO-DIMM is installed in memory expansion slot. Maximum upgradable system memory depends on the model.

• L2 Cache: 1MB L2 Cache (Intel® Celeron® M Processor) 2MB L2 Cache (Intel®

Pentium® M Processor) Video RAM: Depending on the model.

• Up to128 MB integrated solution and shared with main memory for Intel® 915GM/

910GML Express External 64/128 MB VGA DDR RAM for ATI MOBILITYTM RADEON® X300/X600/X600SE GPU

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1 Hardware Overview 1.2 System Unit

 Audio subsystem

• Realtek ALC250 for CODEC

− Bulit-in 7 Bands of Digital Hardware Equalizer for Optimizing Speaker

Response

− Single chip with high S/N ratio (>100dB)

− Meets performance requirements for audio on PC99/2001 systems

− Meets Microsoft WHQL/QLP 2.0 Audio requirements

− 20-bit DAC and 18-bit ADC resolution

− Compliant with AC’97 2.3 specifications

− Support of S/PDIF out is fully compliant with AC’97 rev2.3 specifications

− Supports double sampling rate (96 KHz) of DVD audio playback

− Headphone output with 50mW/20Ω amplifier

− 3D Stereo Enhancement

− Multiple CODEC extension capability

− Power management and enhanced power saving features

− Stereo MIC record for AEC/BF application

− Auxiliary power to support Power OFF CD

− Support 32K/44.1K/48K/96KHz of S/PDIF output

− Support 32K/44.1K/48K of S/PDIF input

− Standard 48-Pin LQFP Package

− EAXTM 1.0&2.0 compatible

− Direct Sound 3DTM compatible

− A3DTM compatible

− I3DL2 compatible

− HRTF 3D Positional Audio

− 10 Bands of Software Equalizer

− Voice Cancellation and Key Shifting in Kara OK mode

− AVRACK® Media Player

− Configuration Panel to improve Experience of User

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Satellite M40X Maintenance Manual

1.3 2.5-inch Hard Disk Drive 1 Hardware Overview

1.3 2.5-inch Hard Disk Drive

The internal HDD is a random access non-volatile storage device. It has a non-removable 2.5inch magnetic disk and mini-Winchester type magnetic heads. The computer supports up to100G HDD. 120GB is design ready.

The HDD is shown in Figure 1-1. Specifications are listed in Table 1-1

Figure 1-1 2.5-inch HDD

Items 40GB 60GB 80GB 100GB

Formatted capacity (GB) 37.26 55.89 74.52 93.15

Logical Blocks (LBA) 78,125,000 117,187,500 156,301,488 195,371,568

Rotational speed (rpm) 4,200/5400 4,200/5400 4200/5400 4200/5400

Toshiba HDD Buffer (MB) 8/16 8/16 8/16 8/16

Hitachi HDD Buffer (MB) 2/8 8/8 8/8 NA/8

Bytes per sector 512 512 512 512

Table 1-1 2.5-inch HDD specifications

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1 Hardware Overview 1.4 Optical device Drives

1.4 Optical device Drives

• DVD-ROM & CD-RW drive

• DVD Super Multi drive

1.4.1 DVD-ROM & CD-RW

The specifications of the DVD-ROM & CD-RW drive are listed in Table 1-2.

Item DVD-ROM mode CD-ROM mode

Data transfer rate (Mbytes/s)

Access time (ms)

Average random access

33.3 (U-DMA transfer mode 2)

16.6 (PIO mode 4, Multiword DMA mode 2)

180 150

Data buffer size (Mbytes) 2MB

DVD:

DVD-VIDEO, DVD-ROM, DVD-R (3.9G,4.7G), DVD-RW (Ver.1.1), DVD-RAM, DVD+R, DVD+RW, DVD+R DL.

Formats supported

CD:

CD-DA, CD-ROM, CD-R, CD-RW, CD-ROMXA, PhotoCD (muitiSession), Video CD, CD-Extra (CD+), CD-Text

Table 1- 2 DVD-ROM & CD-RW drive specifications

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Satellite M40X Maintenance Manual

1.4 Optical device Drives 1 Hardware Overview

1.4.2 DVD Super Multi

The DVD Super Multi drive accepts 12-cm (4.72-inch) and 8-cm (3.15-inch) discs. At maximum, the drive can play back a DVD at 8x speed, read CD-ROM at 24x speed, and write CD-R at 24x speed and CD-RW at 4x speed or Ultra and High speed CD-RW at 10x speed and DVD-R at 8x speed and DVD-RW at 4x speed and DVD+R at 8x speed and DVD+RW at 4x speed and DVDRAM at 3x speed.

The specifications of the DVD Super Multi drive are listed in Table 1-3

Item DVD-ROM mode CD-ROM mode

Data transfer rate (Mbytes/s)

Access time (ms)

Average random access

33.3 (U-DMA transfer mode 2)

16.6 (PIO mode 4, Multiword DMA mode 2)

180 150

Data buffer size (Mbytes) 2MB

DVD:

DVD-VIDEO, DVD-ROM, DVD-R (3.9G,4.7G), DVD-RW (Ver.1.1), DVD-RAM, DVD+R, DVD+RW.

Formats supported

CD:

CD-DA, CD-ROM, CD-R, CD-RW, CD-ROMXA, PhotoCD (muitiSession), Video CD, CD-Extra (CD+), CD-Text

Table 1- 3 DVD Super Multi drive specifications

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1 Hardware Overview 1.4 Optical device Drives

1.4.3 DVD Super Multi Double Layer

The specifications of the DVD Super Multi Double Layer drive are listed in Table 1-4

Item DVD-ROM mode CD-ROM mode

Data transfer rate (Mbytes/s)

Access time (ms)

Average random access

33.3 (U-DMA transfer mode 2)

16.6 (PIO mode 4, Multiword DMA mode 2)

180 150

Data buffer size (Mbytes) 2MB

DVD:

DVD-VIDEO, DVD-ROM, DVD-R (3.9G,4.7G), DVD-RW (Ver.1.1), DVD-RAM, DVD+R, DVD+RW, DVD+R DL.

Formats supported

CD:

CD-DA, CD-ROM, CD-R, CD-RW, CD-ROMXA, PhotoCD (muitiSession), Video CD, CD-Extra (CD+), CD-Text

Table 1- 4 DVD Super Multi Double Layer drive specifications

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Satellite M40X Maintenance Manual

1.5 Power Supply 1 Hardware Overview

1.5 Power Supply

This specification defines the performance and characteristic of 65W and 75W AC adapter power supply. It supplies a constant voltage 19V output source for EAL30 series notebook computer.

 A/D conversion

• The EC uses 10-bit sampling for A/D conversion to determine the following values:

– AC adaptor current

– Battery and temperature

 AC adaptor and battery check

• The EC checks the following by A/D converted values:

– Battery installed

• The EC checks the following by GPIO values:

– AC adaptor connected

 Abnormal check

• The EC determines whether the condition is abnormal, and if so, stores an error

code into the error register.

 Input port management

• The EC monitors the following input signal status:

– System power ON/OFF status

– Direct CD power ON/OFF status

 Beep and LED control

• Beep is caused by the low battery status.

• The EC controls the following two kinds of LED

– DC IN LED (one color: green)

• Green = indicates AC adaptor is connected

– Battery LED (two colors: orange and green)

• Green solid = The battery is fully charged.

• Orange = The computer is quick-charging the battery / The battery is low.

 Power ON/OFF sequence

• When power is turned on or off, the EC starts the power on or off sequence.

– SQ0-4 = power ON sequence

– SQ5-B = power OFF sequence

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1 Hardware Overview 1.5 Power Supply

 Battery charging control

• The EC controls the following.

– The quick charging ON/OFF

– The detection of full charge

 Detection of the low battery

• The EC detects the low battery point by the gas gauge.

– LB10M = The system will be driven by the battery for 12 more minutes.

– LB0 = The battery won't be able to drive the system after 3 minutes.

– LB1 = The battery can drive the system only during the suspend process.

– LB2 = The battery cannot drive the system.

 New battery installation

• When a new battery is installed, the EC communicates with the E

PROM in the

battery to read information of the newly installed battery.

 Battery capacity calculation

• The EC reads battery remaining and percentage capacity from the battery through

SMBus.

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Satellite M40X Maintenance Manual

1.6 Batteries 1 Hardware Overview

1.6 Batteries

The computer has two types of battery:

 Main battery pack (18650 size)

 RTC battery

The removable main battery pack is the computer’s main power source when the AC adaptor is not attached.

The battery specifications are listed in the table below.

Battery name Material Output voltage Capacity

Main battery Lithium-Ion 14.8 V 4300mAH

RTC battery Lithium 3.3 V 15 mAh

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1 Hardware Overview 1.6 Batteries

1.6.1 Main Battery

Battery charging is controlled by a power supply microprocessor that is mounted on the system board. The power supply microprocessor controls whether the charge is on or off and detects a full charge when the AC adaptor and battery are attached to the computer. The system charges the battery using quick charge or trickle charge.

 Quick Battery Charge

When the AC adaptor is attached, there are two types of quick charge: quick charge when the system is powered off and normal charge when the system is powered on.

The times required for charges are listed in the table below.

Status Charging time

Normal charge (power on) 12 hours or longer

Quick charge (power off) About 4 hours

NOTES

1. The time required for normal charge is affected by the amount of power the system is consuming. Use of the fluorescent lamp and frequent disk access diverts power and lengthens the charge time.

2. Using quick charge, the power supply microprocessor automatically stops the charge after eight hours regardless of the condition of the battery. Overcharging could cause the battery to explode.

If any of the following occurs, the battery quick charge process stops.

1. The battery becomes fully charged.

2. The AC adaptor or battery is removed.

3. The battery or output voltage is abnormal.

4. The battery temperature is abnormal.

5. The battery SMBus communication fails.

6. The battery cell is bad.

 Detection of full charge

A full charge is detected from the battery pack through SMBus when the battery is charging.

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Satellite M40X Maintenance Manual

1.6 Batteries 1 Hardware Overview

1.6.2 RTC battery

The RTC battery provides power to keep the current date, time and other setup information in memory while the computer is turned off. The table below lists the charging time and data preservation period of the RTC battery. The RTC battery is charged by the adaptor or main battery, while the computer is powered on.

Status Time

Charging Time (power on) About 24 hours

Data preservation period (full charge) 1 month

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Chapter 2

Troubleshooting Procedures

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+ 195 hidden pages

Toshiba M40X Maintenance Manual

Preface

Table of Contents

Chapter 1 Contents

1.3 2.5-inch Hard Disk Drive

1.4 Optical device Drives