Toshiba qosmio x300 Service Manual
Toshiba Personal Computer
Qosmio X300
Maintenance Manual
TOSHIBA CORPORATION
[CONFIDENTIAL]
Copyright
© 2008 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 Qosmio X300 Maintenance Manual
First edition June. 2008
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 TOSHIBA Qosmio X300 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 IBM PC is a trademark of International Business Machines
Corporation.
Intel, Intel SpeedStep, Intel® CoreTM, Celeron and Centrino are trademarks or registered
trademarks of Intel Corporation.
Windows, Microsoft and Windows Vista® are registered trademarks of Microsoft Corporation.
Photo CD is a trademark of Eastman Kodak.
Bluetooth is a trademark or registered trademark owned by its proprietor and used by TOSHIBA
under license.
Memory Stick is a registered trademark and i.LINK is a trademark of Sony Corporation.
DVD MovieFactory is a registered trademarks of Ulead Systems, Inc.
Labelflash is a trademark of YAMAHA CORPORATION.
Manufactured under license from Dolby Laboratories.
Dolby and the double-D symbol are trademarks of Dolby Laboratories.
Dolby Home Theater is a trademark of Dolby Laboratories.
PalmCheck and TouchPad are trademarks of Synaptics Incorporated.
ExpressCard is a trademark of PCMCIA.
ConfigFree is a trademark of Toshiba Corporation.
Wi-Fi is a registered trademark of the Wi-Fi Alliance.
Secure Digital and SD are trademarks of SD Card Association.
MultiMediaCard and MMC are trademarks of MultiMediaCard Association.
xD-Picture Card is a trademark of FUJIFILM Corporation.
Other trademarks and registered trademarks not listed above may be used in this manual.
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Qosmio X300 Maintenance Manual
Preface
This maintenance manual describes how to perform hardware service maintenance for the
Toshiba Personal Computer Qosmio X300, referred to as the Qosmio X300 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.
Qosmio X300 Maintenance Manual
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The manual is divided into the following parts:
Chapter 1 Hardware Overview describes the Qosmio X300 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
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
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Qosmio X300 Maintenance Manual
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
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Table of Contents
Chapter 1 Hardware Overview
1.1 Features .............................................................................Error! Bookmark not defined.
1.2 2.5-inch HDD..................................................................Error! Bookmark not defined.1
1.3 DVD Super Multi (+-R Double Layer)...........................Error! Bookmark not defined.3
1.4 Power Supply ...................................................................................................................vi4
1.5 Batteries............................................................................................................................vi6
1.5.1 Main Battery………………………………………………………………… vi6
1.5.2 Battery Charing Control …………………………………………………… vi6
1.5.3 RTC battery…………………………………………………………………..vi7
Chapter 2 Troubleshooting Procedures
2.1 Troubleshooting Introduction...........................................................................................2-3
2.2 Troubleshooting Flowchart ............................................2-Error! Bookmark not defined.
2.3 Power Supply Troubleshooting........................................................................................2-9
2.4 Display Troubleshooting...................................……….2-Error! Bookmark not defined.
2.5 Keyboard Troubleshooting.............................................................................................2-17
2.6 External USB Devices Troubleshooting ........................................................................2-19
2.7 TV-Out Failure Troubleshooting ...................................................................................2-21
2.8 TouchPad Troubleshooting ............................................................................................2-23
2.9 Speaker Troubleshooting................................................................................................2-25
2.10 Optical drive troubleshooting………………………………………………………….2-27
2.11 Modem Troubleshooting................................................................................................2-30
2.12 Express card Troubleshooting........................................................................................2-32
2.13 IEEE 1394 Troubleshooting...........................................................................................2-34
2.14 Wireless LAN Troubleshooting.....................................................................................2-36
2.15 Camera troubleshooting………………………………………………………………..2-38
2.16 Bluetooth Troubleshooting……………………………………………………………..240
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2.17 4 in 1 card Troubleshooting…………………………………………………….…...…2-42
2.18 HDD Troubleshooting……………………………………………………………....….2-44
2.19 CRT failure Troubleshooting ………………………………………………….……....2-46
2.20 HDMI Troubleshooting …………………………………………………….……….…2-
48
2.21 Robson Troubleshooting ……………………………………………………….……...2-50
2.22 MIC Troubleshooting ……………………………………………………………….....2-52
2.23 Finger Troubleshooting ……………………………………………………………..…2-54
Chapter 3 Tests and Diagnostics
3.1 The Diagnostic Test...........................................................Error! Bookmark not defined.
3.2 Executing the Diagnostic Test.........................................Error! Bookmark not defined.3
3.3 Display Configuration .......................................................Error! Bookmark not defined.
3.4 Beep sound Test.................................................................Error! Bookmark not defined.
3.5 Fan ON/OFF Test ............................................................Error! Bookmark not defined.9
3.6 Main Battery Charge Test..................................................Error! Bookmark not defined.
3.7 FDD Test............................................................................Error! Bookmark not defined.
3.8 ODD Test...........................................................................Error! Bookmark not defined.
3.9 Keyboard Test..................................................................Error! Bookmark not defined.5
3.10 Mouse (Pad) Test.............................................................Error! Bookmark not defined.7
3.11 LCD Pixels Mode Test ...................................................................................................vii8
3.12 Magnetic switch Test.................................................................................................... vii19
3.13 LAN Test ........................................................................................................................vii0
3.14 RTC Test........................................................................................................................3-23
3.15 Read 1394 GUID...........................................................................................................3-24
3.16 Speaker EQ Check…………...………….…….……………..……………....…….......3-25
3.17 Button Test …………..……………………….………….……………….….…….….3-26
3.18 Memory Test ……………………....…………….………………..….….……3-26
3.19 1st HDD Test …………………………….………………...…………...3-27
3.20 2nd HDD Test................................................................................................................3-31
3.21 RDMI Test ………………………….………………………..…………….………..3-33
3.22 WDMI Test ……………….………………………..…………….………...3-39
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3.23 Memory read and Write test …………………………………………………………...3-35
Chapter 4 Replacement Procedures
4.1 General .............................................................................. Error! Bookmark not defined.
4.2 Battery .............................................................................Error! Bookmark not defined.8
4.3 HDD .......................................................................... Error! Bookmark not defined.10
4.4 Memory ..........................................................................Error! Bookmark not defined.3
4.5 Keyboard cover and Keyboard…………….................... Error! Bookmark not defined.6
4.6 Wireless LAN Card and UWB Card............................... Error! Bookmark not defined.9
4.7 ODD ............................................................................ Error! Bookmark not defined.2
4.8 Express Dummy Card .....................................................Error! Bookmark not defined.6
4.9 Optical Memory Card......................................................Error! Bookmark not defined.8
4.10 Top Cover........................................................................ Error! Bookmark not defined.9
4.11 Display Assembly............................................................Error! Bookmark not defined.2
4.12 DC in jack........................................................................Error! Bookmark not defined.5
4.13 Speakers.............................................................................Error! Bookmark not defined.
4.14 Touch pad and fingerprint board.......................................Error! Bookmark not defined.
4.15 Power Switch................................................................. Error! Bookmark not defined.40
4.16 Audio card....................................................................... Error! Bookmark not defined.1
4.17 MDC Moudule & System Board..................................... Error! Bookmark not defined.3
4.18 VGA Board and VGA Cooling Module.......................... Error! Bookmark not defined.5
4.19 CPU Cooling Module and Fan.......................................... Error! Bookmark not defined.
4.20 CPU ............................................................................Error! Bookmark not defined.2
4.21 Sub-speakers and Sub-woofer.........................................Error! Bookmark not defined.5
4.22 Bluetooth, Wi-Fi Switch, and Touch Pad LED Board....Error! Bookmark not defined.6
4.23 Bridge Media and FM Radio Modules..............................Error! Bookmark not defined.
4.24 Display Mask................................................................... Error! Bookmark not defined.8
4.25 FL Inverter Board............................................................ Error! Bookmark not defined.0
4.27 LCD Module....................................................................Error! Bookmark not defined.2
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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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Chapter 1 Hardware Overview
1 Hardware Overview
Qosmio X300 Maintenance Manual 1-ii
1 Hardware Overview
Chapter 1 Contents
1.1 Features .................................................................................................................. 1-1
1.2 2.5-inch HDD....................................................................................................... 1-11
1.3 DVD Super Multi (+-R Double Layer)................................................................ 1-13
1.4 Power Supply ....................................................................................................... 1-14
1.5 Batteries................................................................................................................ 1-16
1.5.1 Main Battery......................................................................................... 1-16
1.5.2 Battery Charging Control .....................................................................1-16
1.5.3 RTC Battery..........................................................................................1-17
Qosmio X300 Maintenance Manual 1-iii
1 Hardware Overview
Figures
Figure 1-1A ID Parts Description Placement Part A..........................................................1-6
Figure 1-2B ID Parts Description Placement Part B..........................................................1-7
Figure 1-3 SATA HDD .................................................................................................1-11
Figure 1-4 DVD Super Multi Drive ..............................................................................1-13
Tables
Table 1-1 HDD Specifications .....................................................................................1-11
Table 1-2 DVD Super Multi Drive Specifications....................................................... 1-13
Table 1-3 Quick/Normal Charging Time ..................................................................... 1-16
Qosmio X300 Maintenance Manual 1-iv
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1.1 Features
The Toshiba Qosmio X300 a full size notebook PC based on the Dual Core and Quad Core
Processor, providing high-speed processing capabilities and advanced features. The computer
employs a Lithium Ion battery that allows it to be battery-operated for a longer period of time.
The display uses 17.1-inch WXGA/WSXGA LCD panel, at a resolution of 1440 by 900 pixels.
The PGA socket supports BTO for the CPU so that the system can be designed to suit your needs.
The computer has the following features:
Processor (BTO)
The computer is equipped with one of the following Intel® processors.
■ Intel® Dual CoreTM 2 Duo Processor
■ Intel® Quad CoreTM 2 Duo Processor
Memory (BTO)
The computer has two SO-DIMMs slot comes standard with 1GB/2GB/4GB, accepting
BTO/CTO for your memory requirements. It can incorporate up to 8 GB of main memory.
It supports DDR3 at 1067/800MHz.
Battery Pack
The computer is powered by one rechargeable and removable 8 Cell Lithium Ion battery
pack.
RTC Battery
The internal RTC battery backs up the Real Time Clock and calendar.
Hard Disk Drive (HDD) (BTO)
The computer accommodates 9.5 mm and 12.5 mm two kinds of height HDD types with
following storage capacities:
y 160/200/250/320 GB (9.5 mm thick) SATA (5,400rpm)
y 160/200/320 GB (9.5 mm thick) SATA (7,200rpm)
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y 300/400/500 GB (12.5 mm thick) SATA (4,200rpm)
y 500 GB (12.5 mm thick) SATA (5,400rpm)
ODD (BTO)
y 12.7mm height DVD Super Multi drive supporting ±R Double Layer
y 12.7mm height DVD Super Multi drive supporting ±R Double Layer w/ Labelflash
Display (BTO)
The LCD displays available come with one of following types:
y 17.1” WXGA CSV 1-Lamp color display, resolution 1440×900
y 17.1” WSXGA CSV 1-Lamp color display, resolution 1680×1050
Graphics (BTO)
Intel PM45 with NB9E-GS/NB9E-GTX (depending on model)
Keyboard
The internal keyboard provides the embedded numeric overlay keys, dedicated cursor
control overlay keys, and so on. The keyboard is compatible with the IBM® enhanced
keyboard.
Pointing Device
The integrated Touch Pad and control buttons in the palm rest allow control of the onscreen pointer and support functions such as the scrolling of windows.
External Monitor Port
The analog VGA port provides support for VESA DDC2B compatible functions.
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Universal Serial Bus (USB) Ports
The computer has four USB 2.0 ports. It is supported to daisy-chain a maximum of 127
USB devices. The serial data transfer rate is 480 Mbps or 12 Mbps and 1.5 Mbps. These
ports support PnP installation and hot plugging. They also support Sleep and Charge
function.
IEEE1394
This port allows high-speed data transfer to take place between the computer and external
devices such as digital video cameras.
Express Card Slot
A PC Card slot is provided to hold PC Card Standard Type II (5.0 mm) card, capable of
using a variety of PC Cards including 16-bit Multiple Function PC Cards and 32-bit Card
Bus Cards.
PC card HDD boot does not be supported.
Bridge Media Slot
This slot allows you to insert SD, MiniSD/ MicroSD (through adapter), Memory
Stick/Memory Stick Duo (through adaptor), Memory Stick Pro/Memory Stick Duo (through
adaptor), XD and MMC memory card. It supports High speed SD, SDHC and SDIO. An
I/O port heel cover is needed. This model does not support CF cards.
Sound system
The integrated sound system provides support for the computer's internal speakers and
microphone, as allowing an external microphone and headphones to be connected via the
appropriate jacks.
Internal Camera
It supports 1.3M pixels with/without auto macro. It comes with blue LED. Camera and
microphone need to work separately.
HDMI Out Port (BTO)
HDMI out port can connect with Type A connector HDMI cable.
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DisplayPort Out Port (BTO)
DisplayPort out port can connect with DisplayPort cable.
Headphones/S/PDIF/Line out Jack
This jack connects digital speakers or a stereo headphone (16 ohm minimum). When
connected to a digital speaker or headphones, the internal speaker is automatically disabled.
This jack can be used also as S/PDIF jack and enables connection of optical digital
correspondence apparatus.
Microphone/ Line-in Jack
A 3.5mm mini microphone jack enables connection of a three-conductor microphone for
monaural input and also enables the connection of a stereo device for audio input.
LAN (BTO)
The computer has built-in support for Ethernet LAN (10 megabits per second, 10BASE-T),
Fast Ethernet LAN (100 megabits per second, 100BASE-TX) and Gigabit Ethernet LAN
(1000 megabits per second, 1000BASE-T). It is pre-installed as a standard device in some
markets.
Wireless LAN (BTO)
Some computers in this series are equipped with a Wireless LAN card that is compatible
with other LAN systems based on Direct Sequence Spread Spectrum/Orthogonal Frequency
Division Multiplexing radio technology that complies with the IEEE 802.11 Standard
(Revision A, B, G or N Draft Ver. 1.0).
Internal Modem (BTO)
Some models are equipped with the integrated modem. The integrated modem provides
capability for data and fax communications that support the V.90 (V.92) standards and
includes a modem jack for connection to the telephone line. Please note that both the V.90
and V.92 standards are only supported in the USA, Canada, United Kingdom, France,
Germany and Australia - only the V.90 standard is supported in other regions. You should
also be aware that the speed of data and fax transfer will depend on the analog telephone
line conditions. The integrated model is only installed as a standard device in some markets.
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Bluetooth (BTO)
Some computers in this series offer Bluetooth wireless communication functionality which
eliminates the need for cables between electronic devices such as computers and printers.
When implemented, Bluetooth provides a fast, reliable and secure means to achieve
wireless communication in a small space.
Finger Print (BTO)
This product has a fingerprint utility installed for the purpose of enrolling and recognizing
fingerprints. By enrolling the ID and password to the fingerprint authentication device, it is
no longer necessary to input the password from the keyboard. Just by swiping the finger
against the fingerprint sensor.
Internal Camera (BTO)
The computer has an internal camera. The camera has 1.3 Mpix resolution support.
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Figures 1-1A/1-1B/1-1C show the computer and its system unit configuration, respectively.
Figure 1-1A ID Parts Description Placement Part A
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Figure 1-2B ID Parts Description Placement Part B
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The system unit of the computer consists of the following components:
Processor (BTO)
The computer is equipped with one of the following Intel® processors.
■ Intel® Dual CoreTM 2 Duo Processor
■ Intel® Quad CoreTM 2 Duo Processor
Memory (BTO)
The computer has two SO-DIMMs slot comes standard with 1GB/2GB/4GB, accepting
BTO/CTO for your memory requirements. It can incorporate up to 8 GB of main memory.
It supports DDR2 at 1067/800MHz.
BIOS ROM
y 2048KB flash BIOS ROM
y ACPI-compliant BIOS
y SMBIOS V2.4
System Controllers
y Advanced Power Management 1.2 support
y ACPI2.0 b and PC2001 compliant
y Support SMBus specification V2.0
y Hot keys for system control
y Audio volume output control
y External LED control
y Battery scope report and control
y Sticky key support
y Power switch control
y Two host interface channels support
y Supports three independent devices
y Internal Keyboard country selection
y Wireless LAN on/off button
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Graphics Controller
y Daughter board with extension graphic card
y For Single:
− NB9E-GTX with 1GB DDR3
− NB9E-GS with 512MB DDR3
y HDMI 1.3a -CEC support
y DVI-D supported by conversion cable from HDMI
y Hybrid-Power/SLi support
Express Card Controller
y Dummy card with ID shape
y Support USB/PCI Express signals
y One Express card slot/54
Audio Controller
y Realtek Azalia ALC272
y Microsoft inbox audio driver support
y Software EQ support
y Synchronize to change sound output to HDMI when display is changed to HDMI out
with audio output capability
y MAXX audio support by SW solution (BTO by image)
Wireless LAN Controller
y Intel 11a/g (Golan), Intel 11bg (Golan), 11a/g/n (Kedron), (TBD)
y Intel 802.11a/g (Echo Peak 1x2 & Shirley Peak 1x2)
y Intel 802.11a/g/n (Echo Peak 3x3 Shirley Peak 3x3)
y Atheros 802.11a/g (XB62L 1x2), b/g (XB63L 1x2), a/b/g/n (XB72 2x3), a/b/g/n (XB92
2x2)
y Realtek 802.11bg (8187B 1X2) (TBD)
y Intel WiMAX 802.16e (Echo Peak 3x3)
y Normal screw for all model
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1.2 2.5-inch HDD
The computer contains an extremely low-profile and lightweight, high-performance HDD. The
HDD incorporates 9.5 mm / 12.5 mm height magnetic disk and mini-Winchester type magnetic
heads. The HDD interface conforms to Serial ATA. Storage capacities supported are 160, 200,
250, 320, 400, and 500 GB.
The HDD is shown in Figure 1-3 and some of its specifications are listed in Table 1-1.
Figure 1-3 SATA HDD
Table 1-1 HDD Specifications
Item
Capacity (GB) 160 GB 200 GB 250 GB
Rotational
Speed (RPM)
Height 12.5 mm 9.5 mm 9.5mm 9.5 mm 9.5 mm 9.5mm 9.5 mm
User Data
Sectors
Bytes / Sector 512 512 512
4200
RPM
5400
RPM
312,581,808 390,721,968 488,397,168
7200
RPM
Specifications
4200
RPM
5400
RPM
7200
RPM
5400 RPM
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Item
Capacity (GB)
Rotational
Speed (RPM)
Height
User Data
Sectors
Bytes / Sector
Specifications
300 GB 320 GB 400 GB 500 GB
4200 RPM 5400 RPM 7200 RPM 4200 RPM 4200 RPM
12.5 mm 9.5 mm 9.5mm 12.5 mm 12.5
576,072,368 625,142,808 781,422,768 976,773,168
512 512 512 512
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1.3 DVD Super Multi (+-R 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, CD-RW at 4x speed, US CD-RW at 24x speed, High Speed CD-RW at 10x speed, DVDR at 8x speed, DVD-RW at 6x speed, DVD+R at 8x speed, DVD+R (Double Layer) at 4x speed,
DVD-R (Double Layer) at 4x speed, DVD+RW at 8x speed and DVD-RAM at 5x speed.
The DVD Super Multi drive is shown in Figure 1-4 and its specifications are listed in Table 1-2.
Figure 1-4 DVD Super Multi Drive
Table 1-2 DVD Super Multi Drive Specifications
Item DVD-ROM Mode CD-ROM Mode
Data Transfer Rate
(Mbytes/s)
Access Time (ms)
Average Random Access 130 130
Data Buffer Size (Mbytes) 2MB
Formats Supported
SATA 1.5G
16.6 (PIO mode 4, Multiword DMA mode 2)
DVD:
DVD-VIDEO, DVD-ROM, DVD-R, DVD-RW, DVD-RAM,
DVD+R, DVD+-R (Double Layer), DVD+RW.
CD:
CD-DA, CD-ROM, CD-R, CD-RW, CD-ROMXA, Photo CD
(Multi-Session), Video CD, CD-Extra (CD+), CD-Text.
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1.4 Power Supply
The power supply unit provides constant voltage 19V for the system board and performs the
following functions:
1. Power input monitor
y Checks whether the AC adapter (DC power supply) is connected to the computer.
y Checks whether the battery pack is connected to the computer.
y Monitors the DC power supply input voltage (AC Adapter output voltage).
2. Power supply's internal control
y Turns on and off the battery pack charging power supply.
y Issues a charging current instruction to the PWM control IC of the battery pack charging
power supply.
y Controls the supply of DC power supply input (AC Adapter output) to the power supply
unit.
y Controls the supply of power to the system block (load/logic circuit side).
y Controls forced shutdown if the power supply malfunctions.
3. Logic circuit control
y Instructs the gate array to enable/disable tuning the power on.
y Controls power-on/off operation.
4. Status display
y Shows DC-IN (Red Color)
y Shows Power (Red/Amber)
y Shows Main Battery charging (Red/Amber Color).
5. External interface
y Performs communication through the I2C bus (via the internal EC/KBC).
y Transfers the power supply operation mode.
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6. Output monitor
y Monitors the voltage output to the system block (load/logic circuit side).
y Monitors the voltage, over voltage, input/output current of the battery pack.
y Monitors the internal temperature of the battery pack.
y Monitors the supply voltage from the AC adapter.
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1.5 Batteries
The computer has the following two types of batteries:
Main Battery Pack
Real Time Clock (RTC) Battery
1.5.1 Main Battery
The main battery pack serves as the computer's main power source when the AC adapter is not
attached. The main battery maintains the state of the computer so that it can resume it.
1.5.2 Battery Charging Control
Battery charging is controlled by EC KB926. When the AC adapter and battery pack are attached
to the computer, the EC KB926 controls the charge on/off state and detects a full charge.
Battery Charge
When the AC adapter is attached, the battery is charged by off-state charge when the system
is powered off or by on-state charge when it is powered on.
Table 1-3 Quick/Normal Charging Time
State Charge Time
Off-State Charge 8 Cell About 4 hours max
On-State Charge 8 Cell About 12 hours max
NOTE: The time required for normal charge depends on the power consumption by the
system. Using the fluorescent lamp and frequently accessing the disk consume much power
and lengthen the charge time.
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Any of the following cases stops battery charge:
1. The battery becomes fully charged.
2. The AC adapter or battery pack is removed.
3. The battery or AC adapter voltage is abnormal.
Detection of full charge
A full charge is detected only when the battery is being charged by quick or normal charge.
A full charge is detected when either of the following conditions is met:
1. The current in the battery charging circuit drops below the predetermined value.
2. The charging time exceeds the fixed limit.
1.5.3 RTC Battery
The RTC battery provides power to keep the current date, time and other system information in
memory while the computer is turned off.
Qosmio X300 Maintenance Manual 1-17
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