Toshiba Tecra A2-S316 User manual

1
Toshiba Personal Computer
Satellite A50/TECRA A2 Series
Maintenance Manual
TOSHIBA CORPORATION
File Number 960-478

ii SatelliteA50/TECRA A2Maintenance Manual (960-478)
Copyright
© 2004by 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 Satellite A50/TECRA A2 Series Maintenance Manual
First edition April 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 Satellite A50/TECRA A2 series at the time of this manual's
production. However, succeedingcomputers 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
Intel,Intel SpeedStep, Pentium and Celeronare trademarks or registered trademarks of Intel
Corporationor its subsidiaries in the United States and other countries/regions.
Windows and Microsoft are registered trademarks of Microsoft Corporation.
i.LINK is a trademark of Sony Corporation.
Other trademarks and registered trademarks not listed above may be used in this manual.

Satellite A50/TECRAA2Maintenance Manual (960-478)iii
Preface
This maintenance manual describes how to perform hardware service maintenance for the
Toshiba Personal Computer Satellite A50/TECRA A2series.
NOTE: This Satellite A50/TECRA A2 series is a BTO-support personal computer. Each
model has a different configuration. For each model’s configuration, refer to the parts list
dedicated to it.
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.
qBe sure to fasten screws securely with the right screwdriver. Be sure to use the PH
Point size “0”and “1”screwdrivers complying with the ISO/DIS 8764-1:1996. 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.
qIf 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.

iv SatelliteA50/TECRA A2Maintenance Manual (960-478)
The manual is divided into the following parts:
Chapter 1 Hardware Overview describesSatellite A50/TECRA A2 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:
qHandling the LCD module
qBoard layout
qPin assignment
qDisplay codes
qKey layout
qWiring diagrams
qBIOS/KBC/EC Update
qReliability

Satellite A50/TECRAA2Maintenance Manual (960-478)v
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 Ctrland 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 this computer that appears on its display is presented in the type face
below:
Format complete
System transferred

vi SatelliteA50/TECRA A2Maintenance Manual (960-478)
Table of Contents
Chapter 1 Hardware Overview
1.1 Features ......................................................................................................................1-1
1.2 System Block Diagram ..............................................................................................1-6
1.3 3.5-inch USB Floppy Disk Drive............................................................................. 1-10
1.4 2.5-inch Hard Disk Drive......................................................................................... 1-11
1.5 CD-ROM Drive........................................................................................................ 1-16
1.6 DVD-ROM Drive .................................................................................................... 1-17
1.7 DVD-ROM & CD-R/RW Drive .............................................................................. 1-18
1.8 DVD-R/-RW Drive.................................................................................................. 1-20
1.9 DVD Super Multi Drive........................................................................................... 1-21
1.10 Keyboard.................................................................................................................. 1-23
1.11 TFT Color Display................................................................................................... 1-24
1.12 Power Supply ........................................................................................................... 1-28
1.13 Batteries ................................................................................................................... 1-30
1.14 AC Adapter .............................................................................................................. 1-34
Chacxpter2 Troubleshooting Procedures
2.1 Troubleshooting.........................................................................................................2-1
2.2 Troubleshooting Flowchart........................................................................................2-2
2.3 Power Supply Troubleshooting..................................................................................2-6
2.4 System Board Troubleshooting................................................................................ 2-17
2.5 3.5”FDD Troubleshooting ...................................................................................... 2-31
2.6 2.5”HDD Troubleshooting...................................................................................... 2-34
2.7 Keyboard Troubleshooting ...................................................................................... 2-39
2.8 Display Troubleshooting.......................................................................................... 2-40
2.9 Touch Pad Troubleshooting..................................................................................... 2-42
2.10 Optical Drive Troubleshooting................................................................................ 2-43
2.11 Modem Troubleshooting.......................................................................................... 2-44

Satellite A50/TECRAA2Maintenance Manual (960-478)vii
2.12 LAN Troubleshooting .............................................................................................. 2-45
2.13 Sound Troubleshooting............................................................................................ 2-46
2.14 Wireless LAN Troubleshooting............................................................................... 2-48
Chapter 3 Tests and Diagnostics
3.1 The Diagnostic Test...................................................................................................3-1
3.2 Executing the Diagnostic Test ...................................................................................3-3
3.3 Setting of the hardware configuration........................................................................3-7
3.4Subtest Names............................................................................................................3-9
3.5System Test.............................................................................................................. 3-11
3.6Memory Test............................................................................................................ 3-15
3.7Keyboard Test.......................................................................................................... 3-17
3.8Display Test ............................................................................................................. 3-20
3.9Floppy Disk Test...................................................................................................... 3-23
3.10 Printer Test ............................................................................................................... 3-25
3.11ASYNC Test............................................................................................................ 3-27
3.12Hard Disk Test......................................................................................................... 3-29
3.13Real Timer Test........................................................................................................ 3-32
3.14NDP Test.................................................................................................................. 3-34
3.15Expansion Test......................................................................................................... 3-35
3.16CD-ROM/DVD-ROM Test ..................................................................................... 3-37
3.17 Sound/LAN/Modem/TV Test.................................................................................. 3-38
3.18 IEEE1394 Test......................................................................................................... 3-42
3.19 Wireless LAN Test (Atheros).................................................................................. 3-43
3.20 Wireless LAN Test (Calexico)................................................................................. 3-47
3.21 Thermal Raditaion Control Test .............................................................................. 3-50
3.22 Error Code and Error Status Names......................................................................... 3-51
3.23 Hard Disk Test Detail Status.................................................................................... 3-54
3.24 FDD Cleaning .......................................................................................................... 3-56
3.25Log Utilities ............................................................................................................. 3-57
3.26Running Test............................................................................................................ 3-59
3.27Floppy Disk Drive Utilities...................................................................................... 3-61

viii SatelliteA50/TECRA A2Maintenance Manual (960-478)
3.28System Configuration .............................................................................................. 3-66
3.29SETUP ..................................................................................................................... 3-68
Chapter 4 Replacement Procedures
4.1Overview....................................................................................................................4-1
4.2Battery Pack/PC Card ................................................................................................4-8
4.3Memory Module ...................................................................................................... 4-11
4.4MDC Modem........................................................................................................... 4-13
4.5 HDD......................................................................................................................... 4-15
4.6Mini PCI Card.......................................................................................................... 4-18
4.7Cooling Fin/CPU ..................................................................................................... 4-20
4.8Keyboard.................................................................................................................. 4-25
4.9Switch Board............................................................................................................ 4-29
4.10 Optical Drive............................................................................................................ 4-31
4.11 Display Assembly .................................................................................................... 4-33
4.12 Sound Board............................................................................................................. 4-37
4.13 Connector Board ...................................................................................................... 4-38
4.14 FAN.......................................................................................................................... 4-40
4.15 System Board/DC-IN Jack/RTC Battery.................................................................4-41
4.16Battery Latch............................................................................................................ 4-44
4.17Battery Lock............................................................................................................. 4-46
4.18 Touch Pad ............................................................................................................... 4-48
4.19 LCD Unit/FL Inverter .............................................................................................. 4-50
4.20 Latch Assembly........................................................................................................ 4-56
4.21 Wireless LAN Antenna/Speaker/Hinge................................................................... 4-57
4.22 Fluorescent Lamp ..................................................................................................... 4-66
Appendices
Appendix A Handling the LCD Module ........................................................................ A-1
Appendix B Board Layout...............................................................................................B-1
Appendix C Pin Assignment.......................................................................................... C-1
Appendix D Keyboard Scan/Character Codes ............................................................... D-1
Appendix E Key Layout..................................................................................................E-1

Satellite A50/TECRAA2Maintenance Manual (960-478)ix
Appendix F Wiring Diagrams.........................................................................................F-1
Appendix G BIOS/KBC/EC Update .............................................................................. G-1
Appendix H Reliability................................................................................................... H-1

xSatelliteA50/TECRA A2Maintenance Manual (960-478)

Chapter 1
Hardware Overview

1Hardware Overview
1-ii SatelliteA50/TECRA A2 Maintenance Manual(960-478)
1HardwareOverview

1Hardware Overview
Satellite A50/TECRA A2Maintenance Manual (960-478)1-iii
Chapter 1 Contents
1.1 Features ......................................................................................................................1-1
1.2 System Block Diagram ..............................................................................................1-6
1.3 3.5-inch USB Floppy Disk Drive............................................................................. 1-10
1.4 2.5-inch Hard Disk Drive......................................................................................... 1-11
1.5 CD-ROM Drive........................................................................................................ 1-16
1.6 DVD-ROM Drive .................................................................................................... 1-17
1.7 DVD-ROM & CD-R/RW Drive .............................................................................. 1-18
1.8 DVD-R/-RW Drive.................................................................................................. 1-20
1.9 DVD Super Multi Drive........................................................................................... 1-21
1.10 Keyboard.................................................................................................................. 1-23
1.11 TFT Color Display................................................................................................... 1-24
1.11.1 LCD Module........................................................................................ 1-24
1.11.2 FL Inverter Board................................................................................ 1-27
1.12 Power Supply ........................................................................................................... 1-28
1.13 Batteries ................................................................................................................... 1-30
1.13.1 Main Battery........................................................................................ 1-30
1.13.2 Battery Charging Control.................................................................... 1-31
1.13.3 RTC Battery......................................................................................... 1-33
1.14 AC Adapter .............................................................................................................. 1-34

1Hardware Overview
1-iv SatelliteA50/TECRA A2 Maintenance Manual(960-478)
Figures
Figure 1-1Front of the computer.....................................................................................1-4
Figure 1-2 System units configuration............................................................................1-5
Figure 1-3System block diagram....................................................................................1-6
Figure 1-43.5-inch USB FDD....................................................................................... 1-10
Figure 1-52.5-inch HDD............................................................................................... 1-11
Figure 1-6CD-ROM Drive............................................................................................ 1-16
Figure 1-7DVD-ROM Drive ........................................................................................ 1-17
Figure 1-8DVD-ROM & CD-R/RW Drive .................................................................. 1-18
Figure 1-9DVD-R/-RW Drive ...................................................................................... 1-20
Figure 1-10 DVD Super Multi Drive............................................................................... 1-21
Figure 1-11 Keyboard ...................................................................................................... 1-23
Figure 1-12 LCD module.................................................................................................1-24
Tables
Table 1-13.5-inch USB FDD specifications................................................................ 1-10
Table 1-22.5-inch HDD dimensions ........................................................................... 1-11
Table 1-32.5-inch HDD specification......................................................................... 1-13
Table 1-4CD-ROM Drive specifications .................................................................... 1-16
Table 1-5DVD-ROM Drive dimensions ..................................................................... 1-17
Table 1-6DVD-ROM & CD-R/RW Drive specifications ........................................... 1-18
Table 1-7DVD-R/-RW Drive specifications ............................................................... 1-20
Table 1-8DVD Super Multi Drive speciifcations........................................................ 1-21
Table 1-9LCD module specifications.......................................................................... 1-25
Table 1-10 FL inverter board specifications .................................................................. 1-27
Table 1-11 Power supply output rating .......................................................................... 1-29
Table 1-12 Battery specifications ................................................................................... 1-30
Table 1-13 Time required for charges of main battery................................................... 1-31
Table 1-14 Battery preservation time ............................................................................. 1-32
Table 1-15 Time required for charges of RTC battery................................................... 1-33
Table 1-16 AC adapter specifications ............................................................................ 1-34

1.1 Features 1Hardware Overview
Satellite A50/TECRAA2Maintenance Manual (960-478)1-1
1Features
1.1 Features
The Satellite A50/TECRA A2 is a high performance all-in-one PC running a Pentium M or
Celeron M processor.
Features are listed below.
qMicroprocessor [CPU Easy Replaceable]
Microprocessor used is different from each model.
Mobile Intel®Pentium®-M model
A 1.50/1.60/1.70GHz Pentium M processor with a 1.50/1.60/1.70GHz internal
clock, 400MHz bus and 1.48/0.88V core operation
Mobile Intel®Celeron ®-Mmodel
A 1.20/1.30/1.40GHz Celeron M processor with a 1.20/1.30/1.40GHz internal
clock, 400MHz bus and 1.356V core operation
qCache memory
Mobile Intel®Pentium®-M model
64KB L1 cache (in CPU) and 1024KB L2 cache
Mobile Intel®Celeron®-M model
64KB L1 cache (in CPU) and 512KB L2 cache
qMemory
Two SO-DIMM slots for DDR333 or DDR266. Memory modules can be installed to
provide a maximum of 1GB or 2GB (It depend on a model.) Memory modules are
available in 256MB, 512MB and 1,024MB sizes.
Montara-GML model can support 1GB in total as its maximum memory.
Montara-GM+ model can support 2GB in total asits maximum memory.
qVRAM
The computer has VGA imbedded in North Bridge and VRAM in 16-64MB.
qHDD
Single 20GB, 30GB, 40GB, 60GB or 80GB internal drive. 2.5 inch x 9.5mm height.

1Hardware Overview 1.1 Features
1-2Satellite A50/TECRA A2 Maintenance Manual(960-478)
qUSB FDD
The two-mode 3.5-inch USB FDD supports 720KB, and 1.44MB formats.
qDisplay
LCD
Built-in 14.1-or 15.0-inch, XGA (1,024 x 768 dots), or 15-inch, SXGA+ (1,400 x
1,050 dots), 262,144 colors, amorphous silicon TFT color display.
CRT
Supported via an RGB connector.
TV-out
The S-Video terminal supports VIDEO-OUT.
qKeyboard
An easy-to-use 85(US)-/86(UK)-key keyboard (101 Key emulation). Windows key is
supported.
The keyboard also supports touchpad as a pointing device.
qOptical devices
A CD-ROM, DVD-ROM, DVD-ROM & CD-R/RW, DVD-R/-RW or DVD Super
Multi Drive is supported.
qBattery
The RTC battery is mounted inside the computer.
The main battery is a detachable lithium ion battery (2,200mAh: Li-Ion, 3 cell /
4,400mAh: Li-Ion, 6cell / 8,800mAh: Li-Ion, 12cell).
qUSB(Universal Serial Bus)
Two or three USB ports are provided. The ports comply with the USB2.0 standard,
which enables data transfer speeds 40 times faster than USB1.1 standard. USB1.1 is
also supported.
qPC card slot
The PC card slot accepts one Type II (5mm thick) card. The slot is equipped with an
ejector and supports ToPIC-100 (3.3V/CardBus).

1.1 Features 1Hardware Overview
Satellite A50/TECRAA2Maintenance Manual (960-478)1-3
qSound system
The computer has an external monaural microphone connector, stereo headphone
connector and internal stereo speakers.
qWireless LAN (Mini PCI slot)
The wireless LAN (802.11b, 802.11g or 802.11a/g) is equipped on the mini PCI slot.
qLAN/MODEM
Connectors for LAN and Modem are separately mounted.
qRGB
The port enables connection of an external monitor.
qIEEE1394
The computer comes with one IEEE1394 port. It enables high-speed transfer directly
from external devices such as digital video cameras.
qDocking interface port
§RJ-45 LAN jack, RJ-11 Modem jack
§External monitor port
§PS/2 mouse and PS/2 keyboard ports
§Parallel port
§Serial port
§DC IN socket
§Audio line-in, line-out jack
§Four USB ports
§IEEE1394 port (The port is not supported by thecomputer.)
§DVI port (The port is not supported by the computer.)

1Hardware Overview 1.1 Features
1-4Satellite A50/TECRA A2 Maintenance Manual(960-478)
Figure 1-1 shows the front of the computer.
Figure 1-1Front of the computer

1.1 Features 1Hardware Overview
Satellite A50/TECRAA2Maintenance Manual (960-478)1-5
Figure 1-2shows the system units configuration.
Figure 1-2System units configuration

1Hardware Overview 1.2 System Block Diagram
1-6Satellite A50/TECRA A2 Maintenance Manual(960-478)
1.2 System Block Diagram
Figure 1-3 shows the system block diagram.
Figure 1-3System Block Diagram