Toshiba tecra a5 Service Manual

Toshiba Personal Computer

Tecra A5

Maintenance Manual

TOSHIBA CORPORATION

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© 2005 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 Tecra A5 Maintenance Manual First edition May 2005

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 A5 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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Tecra A5 Maintenance Manual

Preface

This maintenance manual describes how to perform hardware service maintenance for the Toshiba Personal Computer Tecra A5, referred to as the A5 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 A5 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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Tecra A5 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 typeface below:

Format complete System transferred

Tecra A5 Maintenance Manual

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Tecra A5 Maintenance Manual

Chapter 1 Hardware Overview

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

1.2 System Unit......................................................................................................................1-6

1.3 2.5-inch Hard Disk Drive.................................................................................................1-8

1.4 Optical device Drives.......................................................................................................1-9

1.5 Power Supply.................................................................................................................1-12

1.6 Batteries .........................................................................................................................1-14

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 TouchPad Troubleshooting............................................................................................2-21

2.9 Speaker Troubleshooting............................................................................................... 2-23

2.10 Optical Drive Troubleshooting...................................................................................... 2-25

2.11 Modem Troubleshooting................................................................................................2-28

2.12 PCMCIA Troubleshooting............................................................................................. 2-30

2.13 IEEE 1394 Troubleshooting ..........................................................................................2-32

2.14 Wireless LAN Troubleshooting..................................................................................... 2-34

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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...............................................................................................................3-8

3.5 Speaker Audio Test.........................................................................................................3=9

3.6 Fan ON/OFF Test...........................................................................................................3-10

3.7 Main Battery Charge Test ..............................................................................................3-11

3.8 FDD Test........................................................................................................................3-12

3.9 CD-ROM Test................................................................................................................3-13

3.10 Keyboard Test................................................................................................................3-14

3.11 Mouse (Pad) Test ...........................................................................................................3-16

3.12 LCD Pixels Mode Test...................................................................................................3-18

3.13 Magnetic Switch Test.....................................................................................................3-19

3.14 HDD R/W Test...............................................................................................................3-20

3.15 LAN Test........................................................................................................................3-22

3.16 RTC Test........................................................................................................................3-14

3.17 Read 1394 GUID.............................................................................................................3-25

3.18 CD Control Button Test ..................................................................................................3-16

3.19 Speaker EQ Type Check&Re-Write ................................................................................3-18

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Tecra A5 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 Expansion Memory.................................................................................................... 4-13

4.6 Optical Drive Module................................................................................................. 4-16

4.7 Optical Drive.............................................................................................................. 4-18

4.8 Keyboard.................................................................................................................... 4-20

4.9 Bluetooth module....................................................................................................... 4-23

4.10 Wireless LAN Unit..................................................................................................... 4-27

4.11 Modem ....................................................................................................................... 4-31

4.12 Display Assembly ...................................................................................................... 4-34

4.13 Top Cover................................................................................................................... 4-37

4.14 Touch Pad................................................................................................................... 4-40

4.15 Direct Play Button Module ........................................................................................ 4-42

4.16 Memory...................................................................................................................... 4-44

4.17 System Board ............................................................................................................. 4-48

4.18 Fan & CPU................................................................................................................. 4-51

4.19 USB Module............................................................................................................... 4-56

4.20 VGA Module.............................................................................................................. 4-58

4.21 Display Mask.............................................................................................................. 4-60

4.22 Speakers ..................................................................................................................... 4-62

4.23 FL Inverter Board....................................................................................................... 4-64

4.24 LCD Module .............................................................................................................. 4-66

Tecra A5 Maintenance Manual

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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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Tecra A5 Maintenance Manual

Chapter 1 Hardware Overview

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1 Hardware Overview

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Tecra A5 Maintenance Manual

1 Hardware Overview

Chapter 1 Contents

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

1.2 System Unit................................................................................................................1-6

1.3 2.5-inch Hard Disk Drive...........................................................................................1-8

1.4 Optical device Drives.................................................................................................1-9

1.4.1 DVD-ROM & CD-RW ............................................................................... 1-9

1.4.2 DVD-ROM................................................................................................1-10

1.4.3 DVD Super Multi Double Layer...............................................................1-11

1.5 Power Supply...........................................................................................................1-12

1.6 Batteries ...................................................................................................................1-14

1.6.1 Main Battery.............................................................................................. 1-15

1.6.2 RTC battery...............................................................................................1-16

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1 Hardware Overview

Figures

Figure 1-1 2.5-inch HDD ................................................................................................ 1-8

Figures

Table 1-1 2.5-inch HDD specifications ......................................................................... 1-8

Table 1-2 DVD-ROM & CD-RW drive specifications ................................................. 1-9

Table 1-3 DVD-ROM drive specifications.................................................................. 1-10

Table 1-4 DVD Super Multi Double Layer drive specifications................................. 1-11

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Tecra A5 Maintenance Manual

1.1 Features 1 Hardware Overview

1.1 Features

The Tecra A5 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 1.6GHz, 1.73GHz, 1.86GHz, 2.0GHz, and 2.13GHz

• Intel Celeron-M Dothan 1.3GHz, 1.4GHz, and 1.5GHz

• FCPGA CPU

 Chipset

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

• ATI MOBILITY RADEON X600SE GPU with HyperMemory

• NVIDIA GeForce Go 6200 GPU with TurboCache technology

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

• ENE KB910Q B4 for keyboard controller, Battery Management Unit, and RTC

• Marvell 88E8053 GIGA LAN controller

• Marvell 88E8036 10/100 LAN controller

• Marvell 88SA8040 for SATA to PATA bridge

• LPC47N217/LPC47N207 Super IO IC for FIR

• LPC47N217 Super IO IC for Printer port

• ALC250_D for AC97 Codec

• TI PCI7411/PCI6411/PCI14510RGVF/PCI1510RGVF for PCMCIA controller

• TI PCI7411/PCI14510RGVF for 1394 controller

• TI PCI7411 for 5-in-1 card reader controller

 Display

• 14” (15:9) TFT screen with a resolution of 1280 horizontal x 768 vertical pixels,

Logic

non-CSV normal brightness, WXGA

CSV normal brightness, WXGA

• 14” (15:9) TFT screen with a resolution of 1280 horizontal x 768 vertical pixels,

CSV high brightness, WXGA

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1 Hardware Overview 1.1 Features

 Memory

• DDR-I 333MHz specification compliant

• Two 200-pin (Jedec Standard) +2.5V SO-DIMM DDR sockets with

256MB/512MB/1GB DDR module

• Maximum upgradeable to 2GB by two 1GB SO-DIMM modules

 BIOS

• 1MB Flash ROM for system and keyboard BIOS

• Suspend to RAM/Disk

• Password protection (System)

• Windows 98 ready with PnP

• Various hot keys for system control

• Refreshable

• Complete ACPI 1.0B function

 Power

• 6 cells of Li-Ion 18650 size, smart battery pack with 4300mAH x 10.8V

• 12 cells of Li-Ion 18650 size smart battery pack with 8600mAH x 10.8V

• 4 hours charging time to 100% capacity on 4300mAH Li-Ion battery

(System off or Suspend)

• 4 hours charging time to 100% capacity on 8600mAH 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-ROM device

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

 Optional Devices

• 128MB/256MB/512MB/1024MB SO-DIMM DDR modules

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Tecra A5 Maintenance Manual

1.1 Features 1 Hardware Overview

• VGA controller NV44MV with 32MB/64MB VRAM or M24C with 64MB/128MB

VRAM

• MINI PCI wireless module (802.11g: Atheros MB43/MB51, Intel Calexico2;

802.11a/g: Atheros MB44, Intel Calexico2)

• Dual-band built-in antenna for wireless LAN communication

• MDC Modem

• Mini PCI module (Analog TV tuner)

• External USB remote control devices

 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.

 Touch Pad

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 Touch Pad incorporates two mouse (left and right) buttons for universal usage.

 I/O Ports

• Four USB (V2.) ports

• One DDC2b compliant 15-pin VGA port

• One S-Video port

• One microphone/mono-in port

• One headphone-out jack

• VR volume control

• Wireless communication switch

• FIR

• One DC-in jack

• One RJ-11 jack for 56kbps V.92 modem

• One RJ-45 jack with LED indicator

• Kensington lock

• One IEEE 1394 port

• One 5-in-1 push-push type flash card connector

• One type II PCMCIA slot with shutter door

• One infrared (IrDA 1.1) port

• One TV outs-video port (4-pin), compatible with PAL or NTSC TV standard

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1 Hardware Overview 1.1 Features

 PCMCIA Card Organization

• One type II card socket

• SRAM, OTPROM, FLASH ROM, mask ROM memory card up to 64MB

• Modem/LAN card

• CardBus card

• ACPI 1.0B compliant

• Supports SD/MMC/MS/MS Pro/xD formats

• High speed SD support

• SD-IO supported

• 1.8" 10.5mm removable ATA device

• CardBus card or PC card with hot insertion and removal

• 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

• Supports xD, SD, MS, MS Pro and MMC

 Universal Serial Bus (USB)

The computer has four 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.

 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

compatible sound system provides internal speakers as well as jacks for an

external microphone and headphone.

 LAN port

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

 Switches

• Power button

• Presto or Vivace from power off, WMP9 (programmable) on Windows

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Tecra A5 Maintenance Manual

1.1 Features 1 Hardware Overview

• Internet Exp lorer (programmable)

• Play/Pause

• Stop

• Fast forward

• Fast rewind

 Excellent power management function

• Standby mode, Suspend to RAM or Suspend to disk mode, using time out or hot

key

• HDD local standby mode by time out

• LCD local standby mode by time out

• Low battery alarm by beep

• Auto-backlight off when LCD cover closed

• Full ACPI 1.0B supported

• LCD auto-dim mode by time out

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1 Hardware Overview 1.2 System Unit

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 or

• Intel® Pentium® M Processor 725A/730/740/750/760/770

 System Logic

• Mobile Intel 915PM/915GM and 910GML Express Chipset host bridge/controller

processor with host bus support

• Integrated DRAM controller

• Integrated VGA controller

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

Logic.

• PCI bus interface

• Power management functions

• Supports DMI

 Keyboard Controller

• ENE KB910 B4 is used for keyboard controller, battery management unit, and RTC.

 Memory

• System DRAM

• Two JEDEC standard 200-pin, 2.5V DDR I SO-DIMM memory support for

256MB/512MB/1024MB/2048MB.

• ROM BIOS for system and keyboard

• 1MB Flash ROM

• Slot: 2 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 upgradeable 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 64/128MB VGA DDR RAM for ATI MOBILITY™ RADEON® X600SE GPU; 32/64MB VGA DDR RAM for nVIDIA GeForce Go 6200

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Tecra A5 Maintenance Manual

1.2 System Unit 1 Hardware Overview

 Audio subsystem

• Realtek ALC250D for AC97 codec

− AC 97 2.2 compatible

− Leading mixed-digital technology

− 20-bit stereo digital-to-analog converters

− 18-bit stereo analog-to-digital converters

− Sample rate converters.

− Four analog line-level stereo inputs for LIN_IN, CD, VIDEO, and AUX

− Two analog line-level mono inputs for modem and internal PC beep

− Dual stereo line-level outputs for LINE_OUT and ALT_LINE _OUT

− Dual microphone inputs

− High quality differential CD input

− Extensive power management support

− Meets or exceeds the Microsoft® PC 99/2001 Audio & WHQL/QLP 2.0

audio

− Built-in 7-band digital hardware equalizer for optimizing speaker response

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

− Support of S/PDIF digital audio output is fully compliant with AC 97 2.2

specifications

− 3D stereo enhancement

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

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1 Hardware Overview 1.3 2.5-inch Hard Disk Drive

1.3 2.5-inch Hard Disk Drive

The internal HDD is a random access non-volatile storage device. It has a non-removable

2.5-inch 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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Tecra A5 Maintenance Manual

1.4 Optical device Drives 1 Hardware Overview

1.4 Optical device Drives

1.4.1 DVD-ROM & CD-RW

The DVD-ROM and CD-RW 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 High speed CD-RW at 10X or Ultra speed CDRW at 24X speed.

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 (multi-session), Video CD, CD-Extra (CD+), CD-Text

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

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1 Hardware Overview 1.4 Optical device Drives

1.4.2 DVD-ROM

The DVD-ROM 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, and read CD-ROM at 24x speed.

The specifications of the DVD-ROM 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) 256 KB

DVD:

DVD-VIDEO, DVD-ROM, DVD-R (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 (multi-session), Video CD, CD-Extra (CD+), CD-Text

Table 1-3 DVD-ROM drive specifications

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Tecra A5 Maintenance Manual

1.4 Optical device Drives 1 Hardware Overview

1.4.3 DVD Super Multi Double Layer

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 5x speed and DVD+R DL at 2.4x speed.

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 (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 (multi-session), Video CD, CD-Extra (CD+), CD-Text

Table 1-4 DVD Super Multi Double Layer drive specifications

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1 Hardware Overview 1.5 Power Supply

1.5 Power Supply

This specification defines the performance and characteristics of the 75W AC adapter power supply. It supplies a constant voltage 15V output source for Tecra A5 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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1.5 Power Supply 1 Hardware Overview

 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 E2PROM 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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1 Hardware Overview 1.6 Batteries

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 (6 cell) Lithium-Ion 10.8V 4300 mAh Main battery (12 cell) Lithium-Ion 10.8V 8600 mAh RTC battery Lithium 3.0V 15 mAh

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Tecra A5 Maintenance Manual

1.6 Batteries 1 Hardware Overview

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 charges: 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.

Tecra A5 Series Maintenance Manual

[CONFIDENTIAL]

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1 Hardware Overview 1.6 Batteries

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 hou rs Data preservation period (full charge) 1 month

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[CONFIDENTIAL]

Tecra A5 Maintenance Manual

+ 225 hidden pages

Toshiba tecra a5 Service Manual

SAFETY PRECAUTIONS

Table of Contents

Chapter 1 Hardware Overview

Chapter 2 Troubleshooting Procedures

Chapter 3 Tests and Diagnostics

Chapter 4 Replacement Procedures

Appendices

1.1 Features

1.2 System Unit

1 Hardware Overview 1.3 2.5-inch Hard Disk Drive

1.4 Optical device Drives 1 Hardware Overview

1.4.1 DVD-ROM & CD-RW

1.4.2 DVD-ROM

1.4.3 DVD Super Multi Double Layer

1.5 Power Supply

1.6 Batteries

1.6.1 Main Battery

1.6.2 RTC battery