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File No. 960-140
1 Toshiba Personal Computer
Copyright
©
1998 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 Libretto 100CT Maintenance Manual First edition February 1998 Disclaimer The information contained in this manual is subject to change without notice. Toshiba Corporation and Toshiba America Information Systems, Inc., assume no liability for damages incurred directly or indirectly from errors, omissions, or discrepancies in connection with the furnishing, performance, or use of this material. Trademarks IBM is a registered trademark, and PC/AT, PS/2 and OS/2 are trademarks of IBM Corporation. MS-DOS and Windows are registered trademarks of Microsoft Corporation. Intel and Pentium are registered trademarks, and MMX is a trademark of Intel Corporation. Lotus is a registered trademark of Lotus Development Corporation. Novell and NetWare are registered trademarks of Novell, Inc. UNIX is a registered trademark of X/Open Company Ltd. Sound Blaster and Pro are trademarks of Creative Technology Ltd. Centronics is a registered trademark of Centronics Data Computer Corporation. All other properties are trademarks or registered trademarks of their respective holders.
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Preface
This maintenance manual describes how to perform hardware service maintenance for the Toshiba Personal Computer Libretto 100CT. 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 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: A Note contains general information that relates to your safe maintenance services. 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 loosen and create a short circuit, which could cause overheating, smoke, or fire. If you replace the battery pack, RTC battery, or backup 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 Chapter 2 Chapter 3 Chapter 4 Appendices Hardware Overview describes the system unit and each FRU. Troubleshooting Procedures explains how to diagnose and resolve FRU problems. Tests and Diagnostics describes how to perform test and diagnostic operations for maintenance service. Replacement Procedures describes the removal and replacement of the FRUs. The eight appendices describe the following: Handling the LCD module Board layout Pin assignments Keyboard scan/character codes Key layout Wiring diagrams BIOS Rewrite Procedures Reliability
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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 keytop 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 keytop 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 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Hardware Overview
Features..................................................................................................................1-1 System Unit Block Diagram....................................................................................1-5 3.5-inch External FDD............................................................................................1-9 2.5-inch Hard Disk Drive......................................................................................1-10 Keyboard..............................................................................................................1-11 TFT Color LCD....................................................................................................1-12 Power Supply .......................................................................................................1-14 Batteries ...............................................................................................................1-16 Troubleshooting Procedures
Chapter 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
Troubleshooting......................................................................................................2-1 Troubleshooting Flowchart.....................................................................................2-2 Power Supply Troubleshooting...............................................................................2-6 System Board Troubleshooting.............................................................................2-14 FDD Troubleshooting...........................................................................................2-25 HDD Troubleshooting ..........................................................................................2-28 Keyboard Troubleshooting....................................................................................2-34 Pointing Device Troubleshooting..........................................................................2-36 Display Troubleshooting.......................................................................................2-37 Tests and Diagnostics
Chapter 3 3.1 3.2 3.3 3.4 3.5 3.6
The Diagnostic Test................................................................................................3-1 Executing the Diagnostic Test.................................................................................3-3 Subtest Names........................................................................................................3-7 System Test............................................................................................................3-9 Memory Test ........................................................................................................3-10 Keyboard Test ......................................................................................................3-12
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File No. 960-140 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 Display Test..........................................................................................................3-16 Floppy Disk Test ..................................................................................................3-20 Printer Test...........................................................................................................3-22 Async Test............................................................................................................3-24 Hard Disk Test .....................................................................................................3-26 Real Timer Test....................................................................................................3-30 NDP Test .............................................................................................................3-32 Expansion Test .....................................................................................................3-33 Sound Test ...........................................................................................................3-35 Error Code and Error Status Names......................................................................3-36 Hard Disk Test Detail Status.................................................................................3-39 Hard Disk Format.................................................................................................3-41 Head Cleaning ......................................................................................................3-46 Log Utilities..........................................................................................................3-47 Running Test ........................................................................................................3-49 Floppy Disk Drive Utilities....................................................................................3-51 System Configuration............................................................................................3-56 SETUP.................................................................................................................3-58 Replacement Procedures
Chapter 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12
Overview................................................................................................................4-1 HDD.......................................................................................................................4-8 Optional Memory Module.....................................................................................4-10 Keyboard..............................................................................................................4-12 Display Assembly..................................................................................................4-13 RTC Battery.........................................................................................................4-17 System Board, Heat Sink and PC Card Slot..........................................................4-18 Display Mask........................................................................................................4-20 FL Inverter Board.................................................................................................4-22 LCD Module ........................................................................................................4-24 Speaker, Power Switch Board and AccuPoint Board.............................................4-27 LCD Flexible Cable and Microphone.....................................................................4-30
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File No. 960-140 4.13 I/O Adapter Board................................................................................................4-35
Appendices Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G Appendix H Handling the LCD Module ......................................................................... A-1 Board Layout.............................................................................................B-1 Pin Assignments......................................................................................... C-1 Keyboard Scan/Character Codes ................................................................D-1 Key Layout ................................................................................................ E-1 Wiring Diagrams .........................................................................................F-1 BIOS Rewrite Procedures ..........................................................................G-1 Reliability...................................................................................................H-1
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Chapter 1 Hardware Overview
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Chapter 1
1.1 1.2 1.3 1.4 1.5 1.6
Contents
Features..................................................................................................................1-1 System Unit Block Diagram....................................................................................1-5 3.5-inch External FDD............................................................................................1-9 2.5-inch Hard Disk Drive......................................................................................1-10 Keyboard..............................................................................................................1-11 TFT Color LCD....................................................................................................1-12 1.6.1 1.6.2 TFT Color LCD Module..................................................................1-12 FL Inverter Board ............................................................................1-13
1.7 1.8
Power Supply .......................................................................................................1-14 Batteries ...............................................................................................................1-16 1.8.1 1.8.2 1.8.3 1.8.4 Main Battery....................................................................................1-16 Battery Icon.....................................................................................1-16 Battery Charging Control.................................................................1-17 RTC Battery ....................................................................................1-17
Figures Figure 1-1 Front of the computer........................................................................................1-4 Figure 1-2 System unit configuration..................................................................................1-4 Figure 1-3 System unit block diagram.................................................................................1-5 Figure 1-4 3.5-inch FDD ...................................................................................................1-9 Figure 1-5 2.5-inch HDD.................................................................................................1-10 Figure 1-6 Keyboard .......................................................................................................1-11 Figure 1-7 TFT color LCD..............................................................................................1-12
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Tables Table 1-1 3.5-inch FDD specifications...............................................................................1-9 Table 1-2 2.5-inch HDD specifications..............................................................................1-9 Table 1-3 LCD specifications...........................................................................................1-12 Table 1-4 FL inverter board specifications.......................................................................1-13 Table 1-5 Power supply board output rating....................................................................1-15 Table 1-6 Battery specifications........................................................................................1-16 Table 1-7 Time required for quick charges........................................................................1-17 Table 1-8 RTC battery charging/data preservation time...................................................1-17
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1 Features
1.1
Features
The computer uses Toshiba's advanced Large Scale Integration (LSI and Complementary ), Metal-Oxide Semiconductor (CMOS) technology extensively to provide compact size, minimum weight, low power usage and high reliability. This computer incorporates the following features and benefits: Microprocessor The computer is equipped with an Intel® Pentium® processor with MMXTM Technology that operates at 166MHz and 1.8/2.5 volts. Memory The computer comes with 32MB of Extend Data Out (EDO) DRAM. HDD The computer has a 2.5-inch HDD with a capacity of 2.1GB HDD or 3.2GB HDD. Display The computer has a 7.1-inch color, Thin Film Transistor (TFT) Liquid Crystal Display (LCD), that enables display up to 256K colors at a resolution 800 x 480 pixels. A video controller and 2MB of VRAM enable an external monitor to display 16M colors at a resolution of 800 x 600 pixels or 64K colors at a resolution of 1024 x 768 pixels. Keyboard An-easy-to-use 80/82-key keyboard provides a numeric keypad overlay for fast numeric data entry or for cursor and page control. The keyboard also includes two keys that have special functions in Microsoft® Windows® 95. It supports software that uses a 101- or 102-key enhanced keyboard. Batteries The computer has two batteries a Lithium-Ion main battery pack and RTC battery that backs up the Real Time Clock and CMOS memory. Expansion memory slot An optional 32MB memory module can be installed in the memory slot.
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File No. 960-140 Universal Serial Bus (USB) The USB enables daisy-chain connection of up to 127 USB-equipped devices and 12Mbps serial data transfer. It is designed for easy configuration by a PnP operating system and provides hot insertion/ejection capability. The USB port is only on the Enhanced Port Replicator. External monitor port The port is available only on the I/O adapter and enables connection of an external SVGA compatible monitor. PC card slot A PC card slot accommodates two 5mm cards (Type II) or one 10.5mm (Type III) card, which support the PC card Standard. These slots support an external FDD, 16-bit PC cards and CardBus PC cards (32 bit) as well as the Zoomed Video (ZV) port cards, which are dedicated to high-performance video data transfer such as MPEG video play back. AccuPoint This pointer control stick, located in the right of the display panel, provides convenient control of the cursor without requiring desk space for a mouse. Docking interface A 140-pin, docking interface port enables connection of the I/O adapter or an optional Enhanced Port Replicator. The Enhanced Port Replicator has two additional PC card slots that one accommodates a 10.5mm card (Type III) and one accommodates a 5mm card (Type II). These slots support CardBus PC card. The Enhanced Port Replicator also has PS/2TM mouse, PS/2 compatible keyboard, USB, parallel, serial and external monitor ports. Infrared port The infrared port is compatible with Fast InfraRed (FIR) standards enabling wireless 4Mbps data transfer with Infrared Data Association (IrDA) 1.1 compatible devices. Sound system A Sound BlasterTM ProTM and Windows Sound System compatible sound system gives the computer multimedia capability. The sound system is equipped with speaker, microphone and stereo headphone jack.
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File No. 960-140 External FDD A 3.5-inch external FDD is connected to the PC card slot and accommodates both 2HD (1.44MB) and 2DD (720KB) disks.
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File No. 960-140 The computer is shown in Figure 1-1. The system unit configuration is shown in Figure 12.
Figure 1-1 Front of the computer
Figure 1-2 System unit configuration
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1.2
System Unit Block Diagram
Figure 1-3 is a block diagram of the system unit.
Figure 1-3 System unit block diagram
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File No. 960-140 The system unit is composed of the following major components: Intel Pentium processor Intel 166MHz Pentium processor with MMX Technology. The math co-processor and 32KB cache memory are integrated into the Pentium. Standard RAM · · · · · 32 MB, four 4M x 16-bit EDO DRAM chips 3.3 volt operation No parity bit Access time 60 ns Data transfer is 64-bit width
BIOS ROM (Flash EEPROM) · 512 KB, one 512K x 8-bit chip - 256 KB are used for system BIOS - 64 KB are used for VGA-BIOS - 8 KB are used for plug and play data area - 8 KB are used for password security - 16 KB are used for boot strap - 288 KB are reserved 5 volt operation Access time 120 ns Data transfer is 8-bit width
· · ·
Optional memory One expansion memory slot is available for 32MB memory modules. The 32MB memory modules consist of four 4M x 16-bit EDO DRAM chips. · · · · 3.3 volt operation No parity bit Access time 60 ns Data transfer is 64-bit width
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File No. 960-140 System Controller Gate Array · This gate array has the following functions: - CPU interface/control - DRAM control - PCI master/slave interface - Write buffer (CPU-DRAM, CPU-PCI, PCI-DRAM) - Prefetch buffer (CPU-PCI, PCI-DRAM) - Mobile-PC/PCI support DMA function - Serial interrupt function - Power management control - Suspend/resume control - CPU stop clock function - PCI clock stop function - ACPI support function
I/O & PC Card Controller Gate Array · This gate array has the following functions: - One UARTs 16550A equivalent (One SIO is used for SIR.) - One parallel port control supported ECP - mini ISA bus control - PCI bus front end control - PC card control - ZV-port support - CardBus control - FIR function - Universal I/O port - Beep volume - Speaker control - RTC One T9934 chip is used
Video Controller · The NeoMagic NM2160 chip is used. The Video controller incorporates 2MB of video memory using a 128-bit data path.
Keyboard Controller (KBC) · One M38813S chip is used. This KBC includes the keyboard scan controller and keyboard interface controller. The KBC controls the internal keyboard, external keyboard, AccuPoint and PS/2 mouse.
AccuPoint Controller (IPSC) · · One EMEP 010B chip is used. This controller provides simultaneous control of the Pointing Device.
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File No. 960-140 Sound Controller · · One OPL3-SA3 is used. The OPL3-SA3 incorporates OPL3 FM synthesizer, Digital Analog Converter (DAC) and MPU401 MIDI interface.
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1.3
3.5-inch External FDD
The 3.5inch external FDD is a thin, high performance reliable drive that supports 720KB (formatted) 2DD and 1.44MB (formatted) 2HD disks. The FDD can be connected to the PC card slot.
The FDD is shown in Figure 1-4. The specifications for the FDD are listed in Table 1-1.
Figure 1-4 3.5-inch FDD Table 1-1 3.5-inch FDD specifications
Item Storage capacity (KB) Unformatted Formatted Number of heads Number of cylinders Access time (ms) Track to track Average Head settling time Recording track density (tpi) Data transfer rate (Kbps) Rotation speed (rpm) Recording method 2-MB mode 2,000 1,440 2 80 3 181 15 135 500 300 1-MB mode 1,000 720 2 80 3 181 15 135 250 300
Modified Frequency Modulation (MFM)
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1.4
2.5-inch Hard Disk Drive
The removable HDD is a random access non-volatile storage device. It has a nonremovable 2.5-inch magnetic disk and mini-Winchester type magnetic heads. The computer supports 2.1GB HDD or 3.2GB HDD. The HDD is shown in Figure 1-5. Specifications are listed in Table 1-2.
Figure 1-5 2.5-inch HDD Table 1-2 2.5-inch HDD specifications
Items Formatted capacity (bytes) Logical cylinders Logical heads Logical sectors Bytes per sector Rotation speed (rpm) Recording method IBM DYKA-22160 2,167,603,200 4,200 16 63 512 4,200 8-9 RLL IBM DYKA-23240 3,253,469,184 6,304 16 63 512 4,200 8-9 RLL
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1.5
Keyboard
The 84-(USA) or 86-(European) key keyboard is mounted on the system unit. The keyboard is connected to the keyboard controller on the system board through a 24-pin flat cable. The keyboard is shown in Figure 1-6. See Appendix E for optional keyboard configurations.
Figure 1-6 Keyboard
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1.6
TFT Color LCD
The display panel contains a TFT color LCD module, a fluorescent lamp (FL) andan FL inverter board. 1.6.1 TFT Color LCD Module The LCD enables display of up to 256K colors at a resolution 800 x 480 pixels. The LCD is shown in Figure 1-7. Specifications are listed in Table 1-3.
Figure 1-7 TFT color LCD Table 1-3 LCD specifications
Items Number of Pixels Dot pitch (mm) (mm) (pixels) Specifications 800x480 0.192x0.192 153.6(H)x92.16(V) 1:150 (Typ)
Display area Contrast
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1.6.2 FL Inverter Board The FL inverter board supplies high frequency current to light the LCD's Fluorescent Lamp. Specifications for the FL inverter are listed in Table 1-4. Table 1-4 FL inverter board specifications
Item Input Output Voltage Power Voltage Current Specifications (V) (W) (Vrms) (mA) 5 2.3 800 2.0 to 3.5*
*NOTE: The FL currents at power on are: Level 3 : 3.5mA Level 2 : 2.9mA
Level 1 : 2.6mA
Level 0 : 2.0mA
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1.7
Power Supply
The power supply supplies ten kinds of voltages to the system board, has one microprocessor and it operates at 4MHz. It performs the following functions: 1. Determines if the AC adapter or battery is connected to the computer. 2. Detects DC output and circuit malfunctions. 3. Controls the battery icon, and DC IN icon. 4. Turns the battery charging system on and off and detects a fully charged battery. 5. Determines if the power can be turned on and off. 6. Provides more accurate detection of a low battery. 7. Calculates the remaining battery capacity. The embedded controller operates at 2MHz and has the following functions: 1. Controls ACPI in Windows 98. 2. Monitors the computer's temperature. 3. Controls power supply to the docking port. 4. General purpose port.
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File No. 960-140 The power supply output rating is specified in Table 1-5. Table 1-5 Power supply board output rating
Power supplied Yes/No Use CPU CPU, CLKGEN, System Controller GA CLKGEN System Controller GA, PC Card Slot, VGA Controller, I/O & PC Card Controller GA, DRAM VGA Controller, PC Card Slot Flash Memory, KBC, IPSC, LCD Panel, HDD, LEDs, Sound, E2PROM,GA KB/Mouse Port PSC Embedded Controller RTC Name +1.8V +2.5V +3.3V B3V Voltage(V) 1.8 2.5 3.3 3.3 Suspend NO NO NO YES Power off NO NO NO NO No battery NO NO NO NO
B5V VCC
5.0 5.0
YES NO
NO NO
NO NO
IFVCC MCV S5V RTCV
5.0 5.0 5.0 5.0
NO YES YES YES
NO YES YES YES
NO NO NO YES
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1.8
Batteries
The computer has tow types of batteries: Main battery pack RTC battery The battery specifications are listed in Table 1-6. Table 1-6 Battery specifications
Battery name Main battery Material Lithium-Ion Output voltage 10.8 V Capacity 1,200 mAh 2,400 mAh (High capacity) RTC battery Nickel Metal Hydride 2.4 V 11 mAh
1.8.1 Main Battery
The removable main battery pack is the computer's main power source when the Universal AC Adapter is not connected. The main battery pack maintains the state of the computer when the computer enters in resume mode. 1.8.2 Battery Icon The icon shows the status of the removable battery pack. The status of each can be determined by color: Orange Green Blinking orange No light The battery is being charged. (Universal AC Adapter connected) The battery is full charged. (Universal AC Adapter connected) The battery is low when the power is on. Under any other conditions, the LED does not light.
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1.8.3 Battery Charging Control Battery charging is controlled by a power supply microprocessor that is mounted on the system board. The microprocessor controls whether the charge is on or off and detects a full charge when the Universal AC Adapter and battery are connected to the computer. The system charges the battery using quick charge or trickle charge. Quick Battery Charge The battery quick charges when the Universal AC Adapter is connected and the system is powered off or in suspend mode. Table 1-7 Time required for quick charges
Status Quick charge 1(power off) Quick charge 2(power on) Charging time 2 to 3 hours 5 to 6 hours
If any of the following occurs, the Main Battery quick charge process stops. 1. The Main Battery becomes fully charged. 2. The AC adapter or Main Battery is removed. 3. The Main Battery or output voltage is abnormal. Trickle Battery Charge When the main battery is fully charged and the AC adapter is attached, the microprocessor automatically changes quick charge 1 or 2 to trickle charge. 1.8.4 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. Table 1-8 lists the charging time and data preservation period of the RTC battery. Table 1-8 RTC battery charging/data preservation time
Status Charging Time Data preservation period (full charge) Time 48 hours 1 month
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Chapter 2 Troubleshooting Procedures
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Chapter 2
2.1 2.2 2.3
Contents
Troubleshooting......................................................................................................2-1 Troubleshooting Flowchart.....................................................................................2-2 Power Supply Troubleshooting...............................................................................2-6 Procedure 1 Procedure 2 Procedure 3 Procedure 4 Procedure 5 Power Status Check.............................................................2-6 Error Code Check................................................................2-8 Connection Check..............................................................2-11 Quick Charge Check ..........................................................2-12 Replacement Check............................................................2-13 Message Check ..................................................................2-15 Printer Port LED Check on Boot Mode..............................2-17 Printer Port LED Check on Resume Mode.........................2-23 Diagnostic Test Program Execution Check.........................2-24 Replacement Check............................................................2-24 FDD Head Cleaning Check ................................................2-25 Diagnostic Test Program Execution Check.........................2-26 Connector Check and Replacement Check..........................2-27 Message Check ..................................................................2-29 Partition Check ..................................................................2-30 Format Check ....................................................................2-31 Diagnostic Test Program Execution Check.........................2-32 Connector Check and Replacement Check..........................2-33 Diagnostic Test Program Execution Check.........................2-34 Connector and Replacement Check....................................2-35
2.4
System Board Troubleshooting.............................................................................2-14 Procedure 1 Procedure 2 Procedure 3 Procedure 4 Procedure 5
2.5
FDD Troubleshooting...........................................................................................2-25 Procedure 1 Procedure 2 Procedure 3
2.6
HDD Troubleshooting ..........................................................................................2-28 Procedure 1 Procedure 2 Procedure 3 Procedure 4 Procedure 5
2.7
Keyboard Troubleshooting....................................................................................2-34 Procedure 1 Procedure 2
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File No. 960-140 2.8 Pointing Device Troubleshooting..........................................................................2-36 Procedure 1 Procedure 2 2.9 Procedure 1 Procedure 2 Diagnostic Test Program Execution Check.........................2-36 Connector and Replacement Check ....................................2-36 Diagnostic Test Program Execution Check.........................2-37 Connector and Replacement Check....................................2-38
Display Troubleshooting.......................................................................................2-37
Figures Figure 2-1 Troubleshooting flowchart ...............................................................................2-3 Figure 2-2 Printer port LED............................................................................................2-17
Tables Table 2-1 Battery icon.......................................................................................................2-6 Table 2-2 DC IN icon........................................................................................................2-7 Table 2-3 Printer port LED boot mode status .................................................................2-18 Table 2-4 Printer port LED Resume mode error status.....................................................2-23 Table 2-5 FDD error code and status...............................................................................2-26 Table 2-6 Hard disk drive error code and status...............................................................2-32
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1
1.1
Troubleshooting
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the computer is causing the computer to malfunction. The FRUs covered are: 1. System Board 2. FL Inverter Board 3. Floppy Disk Drive 4. Hard Disk Drive 5. Keyboard 6. Display 7. Pointing Board
The Diagnostics Disk operations are described in Chapter 3. Detailed replacement procedures are given in Chapter 4. The following tools are necessary for implementing the troubleshooting procedures: 1. Diagnostics Disk 2. Phillips screwdriver (2 mm) 3. Toshiba MS-DOS system disk(s) (You must install the following onto the disk: SYS.COM, FORMAT.COM, FDISK.COM and FDISK.EXE) 4. 2DD or 2HD formatted work disk for floppy disk drive testing 5. Cleaning kit for floppy disk drive troubleshooting 6. Printer port LED 7. Printer port wraparound connector 8. Serial port wraparound connector 9. PC card wraparound card 10. Multimeter 11. I/O Adapter 12. External FDD
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1.2
Troubleshooting Flowchart
Use the flowchart in Figure 2-1 as a guide for determining which troubleshooting procedures to execute. Before going through the flowchart steps, verify the following: Ask the user if a password is registered and, if it is, ask him or her to enter the password. If the user has forgotten the system password, perform the following procedure at the appropriate step in the flowchart in Figure 2-1: Connect the printer port wraparound board (F31PRT), then turn the POWER switch on. The computer will override the password function by erasing the current password. Verify with the customer that Toshiba Windows 95 is installed on the hard disk. NonToshiba operating systems can cause the computer to malfunction. Make sure all optional equipment is removed from the computer. Make sure the floppy disk drive is empty.
®
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Figure 2-1 Troubleshooting flowchart (1/2)
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Figure 2-1 Troubleshooting flowchart (2/2) If the diagnostics program cannot detect an error, the problem may be intermittent. The Running Test program should be executed several times to isolate the problem. Check the Log Utilities function to confirm which diagnostic test detected an error, then perform the appropriate troubleshooting procedures as follows: 1. If an error is detected on the system test, memory test, display test, async test, printer test, expansion test, sound test or real timer test, perform the System Board Troubleshooting Procedures in Section 2.4. 2. If an error is detected on the floppy disk test, perform the FDD Troubleshooting Procedures in Section 2.5. 3. If an error is detected on the hard disk test, perform the HDD Troubleshooting Procedures in Section 2.6.
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File No. 960-140 4. If an error is detected on the keyboard test, perform the Keyboard Troubleshooting Procedures in Section 2.7. 5. If an error is detected on the display test, perform the Display Troubleshooting Procedures in Section 2.9.
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1.3
Power Supply Troubleshooting
The power supply controls many functions and components. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other Procedures as instructed. The procedures described in this section are: Procedure 1: Power Status Check Procedure 2: Error Code Check Procedure 3: Connection Check Procedure 4: Quick Charge Check Procedure 5: Replacement Check Procedure 1 Power Status Check
The following icons indicate the power supply status: Battery icon DC IN icon The power supply controller displays the power supply status through the Battery and the DC IN icons as listed in the tables below. Table 2-1 Battery icon
Battery icon Lights orange Lights green Blinks orange (even intervals) Flashes orange Doesn't light Quick charge Battery is fully charged and AC adapter is connected The battery level becomes low while operating the computer on battery power.*1 *2 The power switch is pressed on when the battery level is low. Any condition other than those above. Power supply status
*1 Auto Hibernation Off will be executed soon. *2 Auto Hibernation Off has already been executed.
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File No. 960-140 Table 2-2 DC IN icon
DC IN icon Lights green Blinks orange Doesn't light Power supply status DC power is being supplied from the AC adapter. *3 Power supply malfunction Any condition other than those above.
*3 When the power supply controller detects a malfunction, the DC IN icon blinks and an error code is displayed. To check the power supply status, install a battery pack and connect an AC adapter. Check 1 Check 2 Check 3 If the DC IN icon blinks orange, go to Procedure 2. If the DC IN icon does not light, go to Procedure 3. If the battery icon does not light orange or green, go to Procedure 4.
CAUTION: Use only an AC adapter manufactured for the Libretto 100CT. If you use another AC adapter, the computer's power supply may malfunction or a fuse on the system board may be blown.
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Procedure 2
Error Code Check
If the power supply microprocessor detects a malfunction, the DC IN icon blinks orange. The blink pattern indicates an error as shown below. Start Error code (8 bit) "1" "0" Interval between data bits On for one second On for half second Off for half second Off for 2 seconds
The error code begins with the least significant digit. Example: Error code 12h (Error codes are given in hexadecimal format.)
Check 1
Convert the DC IN icon blink pattern into the hexadecimal error code and compare it to the tables below.
DC power supplied through AC adapter
Error code 10h 12h 13h 14h Meaning AC Adapter voltage is over 16.5V (15V+10%). Current from the DC power supply is over the limit (3.13A). Current from the DC power supply is over the limit (0.5A) when there is no load. Current sensing IC is not normal.
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File No. 960-140 Main Battery
Error code 20h 21h 22h 23h 24h 25h Meaning Battery voltage is over the limit (13.46V). Main battery charge current is over the limit (2.53A). Mai battery discharge current is over the maximum allowed limit when there is no load (0.5A). Main battery charge current is over limit (1.80A) whenthere . Current sensing IC is not normal. Main battery charge current is over the limit (0.5A).
S5V output
Error code 40h Meaning S5V voltage is under the limit (4.75V).
B5V output
Error code 50h 51h 52h 53h Meaning B5V voltage is over the limit (5.5V). B5V voltage is under the limit (4.5V) when power supply is turned on. B5V voltage is under the limit (4.5V) when the computer is booting up. B5V dose not start up when the computer is suspended.
B3V output
Error code 60h 61h 62h 63h Meaning B3V voltage is over the limit (3.8V). B3V voltage is under the limit (2.81V) when power supply is turned on. B3V voltage is under the limit (2.81V) when the computer is booting up. B3V dose not start up when the computer is suspended.
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File No. 960-140 B2V output
Error code 70h 71h 72h 73h Meaning B2V voltage is over the limit (2.88V). B2V voltage is under the limit (2.13V) when power supply is turned on. B2V voltage is under the limit (2.13V) when the computer is booting up. B2V voltage is over the limit (2.13V) when power supply is turned off.
B1V output
Error code 80h 81h 82h 83h Meaning B1V voltage is over the limit (2.16V). B1V voltage is under the limit (1.44V) when power supply is turned on. B1V voltage is under the limit (1.44V) when the computer is booting up. B1V voltage is over the limit (1.44V) when power supply is turned off.
Check 2
In the case of error code 10h: Make sure the AC adapter is firmly connected to the computer is DC IN socket and to power source. If this cables are connected correctly, go to the following step: Replace the AC adapter with a new one. If the error still exists, go to Procedure 5.
Check 3
In the case of error code 20h: Make sure the battery pack is correctly installed in the computer. If the battery pack is correctly installed, go to the following step: Replace the battery pack with a new one. If the error still exists, go to Procedure 5.
Check 4
In the case of error code 21h: Go to Procedure 3.
Check 5
When for any other error, go to Procedure 5.
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File No. 960-140
Procedure 3
Connection Check
The power supply wiring diagram is shown below:
Any of the connectors may be disconnected. Perform Check 1. Check 1 Make sure the Libretto 100's AC adapter is firmly connected to the computer's DC IN socket and a power source. If these cables are connected correctly, go to Check 2. Replace the AC adapter with a new one. If the DC IN icon does not glow green, go to Procedure 5.
Check 2
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File No. 960-140 Procedure 4 Quick Charge Check
The power supply may not charge the battery pack. Perform the following procedures: 1. Reinstall the battery pack. 2. Attach the AC adapter and turn on the power. If you cannot turn on the power, go to Procedure 5. 3. Run the Diagnostic test, go to System test and execute subtest 06 (quick charge) described in Chapter 3. 4. When quick charge is complete, the diagnostics test displays the result code. Check the result code against the table below and perform any necessary check.
Result code 0 1 2 3 4 5 6 7 8 Contents The battery is quick charging normally. The battery is fully charged. The AC adapter is not attached. The AC adapter's output voltage is not normal. The Battery is not installed. The battery's output voltage is not normal. The battery's temperature is not normal. A bad battery is installed. Any other problems. Check items Normal Normal Check 1 Check 1 Check 2 Check 3 Check 4 Check 2 Check 5
Check 1
Make sure the AC adapter and AC power cord are firmly plugged into the DC IN socket and the wall outlet. If these cables are connected correctly, replace the AC power cord and AC adapter. Make sure the battery is properly installed. If the battery is properly installed, replace it with a new one. The battery pack may be completely discharged. Wait a few minutes to charge the battery pack. If the battery pack is still not charged, replace the battery pack with a new one. The battery's temperature is too hot or cold. Return the temperature to a normal operating condition. If the battery pack still is not charged, replace the battery pack with a new one. Go to Procedure 5.
Check 2 Check 3
Check 4
Check 5
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File No. 960-140
Procedure 5
Replacement Check
The AC adapter may be disconnected or damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures. After checking the connection, perform the following checks: Check 1 Check 2 Replace the AC adapter with a new one. If the problem still exists, go to Check 2. Replace the system board with a new one. Refer to Chapter 4 for instructions on how to remove and replace the system board.
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File No. 960-140
1.4
System Board Troubleshooting
This section describes how to determine if the system board is defective or not functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are: Procedure 1: Message Check Procedure 2: Printer Port LED Check on Boot Mode Procedure 3: Printer Port LED Check on Resume Mode Procedure 4: Diagnostic Test Program Execution Check Procedure 5: Replacement Check
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File No. 960-140
Procedure 1
Message Check
When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in the BIOS ROM. The IRT tests each IC on the system board and initializes it. If an error message is shown on the display, perform Check 1. If there is no error message, go to Procedure 2. If Toshiba MS-DOS or Toshiba Windows 95 is properly loaded, go to Procedure 4. Check 1 If one of the following error messages displays on the screen, press the F1 key as the message instructs. These errors occur when the system configuration preserved in the RTC memory (CMOS type memory) is not the same as the actual configuration or when the data is lost. If you press the F1 key as the message instructs, the TSETUP screen appears to set the system configuration. If error message (b) appears often when the power is turned on, replace the RTC battery. If any other error message displays, perform Check 2.
(a) (b) (c) (d) (e) (f) (g) *** Bad HDD type *** Check system. Then press [F1] key *** Bad RTC battery *** Check system. Then press [F1] key *** Bad configuration *** Check system. Then press [F1] key *** Bad memory size *** Check system. Then press [F1] key *** Bad time function *** Check system. Then press [F1] key *** Bad check sum (CMOS) *** Check system. Then press [F1] key *** Bad check sum (ROM) *** Check system. Then press [F1] key ...... ...... ...... ...... ...... ...... ......
Check 2
If the following error message displays on the screen, press any key as the message instructs. If any other error message displays, perform Check 3. The following error message appears when data stored in RAM under the resume function is lost because the battery has become discharged or the system board is damaged. Go to Procedure 3. WARNING: RESUME FAILURE.
PRESS ANY KEY TO CONTINUE.
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File No. 960-140 Check 3 The IRT checks the system board. When the IRT detects an error, the system stops or an error message appears. If one of the following error messages (1) through (17), (24) or (25) displays, go to Procedure 5. If error message (18) displays, go to the Keyboard Troubleshooting Procedures in Section 2.7. If error message (19), (20) or (21) displays, go to the HDD Troubleshooting Procedures in Section 2.6. If error message (22) or (23) displays, go to the FDD Troubleshooting Procedures in Section 2.5. (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) PIT ERROR MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR VRAM ERROR SYSTEM MEMORY ERROR SYSTEM MEMORY PARITY ERROR EXTENDED MEMORY ERROR EXTENDED MEMORY PARITY ERROR DMA PAGE REGISTER ERROR DMAC #1 ERROR DMAC #2 ERROR PIC #1 ERROR PIC #2 ERROR KBC ERROR HDC ERROR HDD #0 ERROR HDD #1 ERROR NO FDD ERROR FDC ERROR TIMER INTERRUPT ERROR RTC UPDATE ERROR
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File No. 960-140
Procedure 2
Printer Port LED Check on Boot Mode
The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for boot mode. Figure 2-2 shows the printer port LED.
Figure 2-2 Printer port LED To use the printer port LED follow the steps below: 1. Plug the printer port LED into the computer's parallel port. 2. Hold down the space bar and turn on the computer's power. 3. Read the LED status from left to right as you are facing the back of the computer. 4. Convert the status from binary to hexadecimal notation. 5. If the final LED status is FFh (normal status), go to Procedure 4. 6. If the final LED status matches any of the test status values in Table 2-3, perform Check 1. NOTE: If an error condition is detected by the IRT test, the printer port LED displays an error code after the IRT test ends. For example, when the printer port LED displays 1F and halts, the IRT test has already completed the Display initialization. In this instance, the IRT indicates an error has been detected during the system memory test.
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File No. 960-140 Table 2-3 Printer port LED boot mode status (1/5)
LED Status FFh B0h
Start Flash ROM check
Test item
Message
Register initialization for boot block PIT ch.0 initialization BIOS rewrite flag initialization Transition to protected mode Boot block checksum KBC initialization BIOS (runtime and IRT) checksum
B2h B3h
KBC initialization (1)
BIOS rewrite
KBC initialization BIOS rewrite request check Canceling power down of L2-cache Enabling CMOS access Port 25h unlock
00h
Special register initialization
Toshiba register initialization (1) Toshiba register initialization (2)
01h
Memory check
DRAM size check Memory structure configuration SM-RAM stack area test
05h
CMOS check and initialization ROM to RAM copy
Enabling cache
CMOS access test CMOS checksum CMOS data initialization Set DRAM size Resume branch check CMOS error check Resume status check SM-RAM checksum System BIOS checksum Toshiba register initialization (3) Set SM-RAM base address Grant SMI KBC initialization
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File No. 960-140 Table 2-3 Printer port LED boot mode status (2/5)
LED Status 05h Test item
PIT initialization Start resume sequence Resume error process SM-RAM initialization ROM to RAM copy and enabling shadow RAM Toshiba register initialization (3)
Message
06h
SMI initialization KBC initialization (2)
SM-RAM base rewrite Set SMI handler Grant SMI Estimate operation clock speed Grant all SMIs Measure for miscellaneous GA Date check for alarm power on Canceling HDD hardware reset Set COMS default configuration when CMOS error detected KBC initialization
03h
VGA initialization Sound initialization PIT initialization
VGA controller power off and reset control Sound controller initialization PIT test and initialization PIC initialization PIC test CPU type discrimination Self-test control status initialization
04h
PIC initialization
02h
PCI initialization
PCI initialization Detection of VGA controller on ISA
71h
Set CMOS initialize register
Printer port wraparound connector detection CMOS data initialization for APM Set divider control register Set counter control register Set configuration number and sleep counter initialization
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File No. 960-140 Table 2-3 Printer port LED boot mode status (3/5)
LED Status 07h 73h 72h 74h 76h Test item
PnP initialization Desk station initialization Get PnP information Password initialization TSETUP PnP initialization Initialization of NS Super I/O in desk station PnP ISA card separation and get resource information Password initialization TSETUP hardware configuration Issuing power off grant command Set CPU speed Set speaker Set battery alarm Set panel close alarm Set panel power on/off PnP system resource configuration
Message
79h
Serial port configuration PC card configuration PnP automatic configuration
Serial port configuration
Modem port configuration PC card initialization PnP automatic configuration
77h
EC and PSC configuration
Grant embedded controller SMI SLP_TYP setting Power supply microprocessor configuration
78h
PCI device initialization (1)
Ensure work area for automatic configuration Initialization of work area Create reserved resource map
81h 82h 83h
PCI device initialization (2) PCI device initialization (3) PCI device initialization (4)
Add reserved resource for primary display device to map Add reserved variable resource to map PCI automatic configuration Special process after PCI configuration
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File No. 960-140 Table 2-3 Printer port LED boot mode status (4/5)
LED Status 7Bh Test item
HDD initialization FDD initialization
Message
Printer port configuration HDD initialization Serial interrupt control FDD initialization Open closing PCI device
7Ch
BIOS RAM update
IRQ routing table update Copying parameter in IRT BIOS to runtime BIOS
7Ah 08h 09h 0Dh
VGA initialization Output code generation First 64 KB memory check System configuration
Video card recognition and wait for VGA chip initialization Output code generation First 64 KB memory check Store CMOS error information to SM-RAM Timer initialization Get version of embedded controller and PS microprocessor Set default value to embedded controller Toshiba special register initialization Grant SMI from docking port and Selectable Bay
19h
Display initialization Selectable Bay lock check
VGA BIOS initialization Selectable Bay lock check Displaying logo PnP automatic configuration PnP ISA card isolation Search assignable resource and card configuration
1Fh 20h
Displaying logo PnP configuration
21h 25h 30h 40h 41h 42h 70h 80h
System memory check Expansion memory check DMA page check DMAC check DMAC configuration Printer port check SIO check NDP configuration
System memory check Expansion memory check DMA page check DMAC check DMAC configuration Printer port check SIO check NDP configuration
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File No. 960-140 Table 2-3 Printer port LED boot mode status (5/5)
LED Status A0h C0h A6h Test item
Boot password External I/O check BIOS information update Boot password External I/O check Set font address Set shadow RAM size Set expansion memory size to CMOS System resource update Set extended memory size to runtime BIOS for INT15h ACPI table update Set SCT area to runtime BIOS Set battery save mode Send date to PS microprocessor Close PCI device configuration area Protect system BIOS Cache control
Message
FEh FFh
System ROM check End
System ROM check
Check 1
If any of the following error codes display, go to Procedure 5. B0h, B2h, B3h, 00h, 01h, 05h, 06h, 03h, 04h, 02h, 71h, 07h, 73h, 74h, 72h, 76h, 79h, 77h, 78h, 81h, 82h, 7Bh, 7Ch, 7Ah, 08h, 09h, 0Dh, 19h, 1Fh, 20h, 21h, 25h, 30h, 40h, 41h, 42h, 70h, 80h, A0h, C0h, A6h, FEh
Check 2
If error code 83h is displayed, go to the following sections: Section 2.5. FDD Troubleshooting Section 2.6. HDD Troubleshooting
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File No. 960-140
Procedure 3
Printer Port LED Check on Resume Mode
The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for Hibernation mode. To use the printer port LED follow the steps below: 1. Make sure the computer is in Resume mode. 2. Plug the printer port LED into the computer's parallel port. 3. Turn on the computer's power. 4. Read the LED status from left to right as you face the back of the computer. 5. Convert the status from binary to hexadecimal notation. 6. If the final LED status is FFh (normal status), go to Procedure 4. 7. If the final LED status matches any of the test status values in Table 2-4, perform Procedure 5. Table 2-4 Printer port LED Resume mode error status
Error status F1H F2H F3H F4H F5H F7H F8H Meaning of status System BIOS RAM checksum error External display card is connected. HDD was installed. SMRAM checksum error or memory error during suspend Conventional memory checksum error Extended memory checksum error PnP RAM checksum error
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File No. 960-140
Procedure 4
Diagnostic Test Program Execution Check
Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3,Tests and Diagnostic, for more information on how to perform these tests. 1. System test 2. Memory test 3. Keyboard test 4. Display test 5. Floppy Disk test 6. Printer test 7. ASYNC test 8. Hard Disk test 9. Real Timer test 10. NDP test 11. Expansion test 12. Sound test If an error is detected during these tests, go to Procedure 5. Procedure 5 Replacement Check
The system board may be damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures and replace the system board with a new one.
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File No. 960-140
1.5
FDD Troubleshooting
This section describes how to determine if the FDD is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required. Procedure 1: FDD Head Cleaning Check Procedure 2: Diagnostic Test Program Execution Check Procedure 3: Connector Check and Replacement Check Procedure 1 FDD Head Cleaning Check
FDD head cleaning is one option available in the Diagnostic Program. A detailed operation is given in Chapter 3, Tests and Diagnostics. Insert the Diagnostics Disk in the computer's floppy disk drive, turn on the computer and run the test. Clean the FDD heads using the cleaning kit. If the FDD still does not function properly after cleaning, go to Procedure 2. If the test program cannot be executed on the computer, go to Procedure 2.
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File No. 960-140
Procedure 2
Diagnostic Test Program Execution Check
Insert the Diagnostics Disk in the FDD, turn on the computer and run the test. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostics test procedures. Floppy disk drive test error codes and their status names are listed in Table 2-5. Make sure the floppy disk is formatted correctly and that the write protect tab is disabled. If any other errors occur while executing the FDD diagnostics test, go to Check 1. Table 2-5 FDD error code and status
Code 01h 02h 03h 04h 06h 08h 09h 10h 20h 40h 60h 80h EEh FFh Bad command Address mark not found Write protected Record not found Media removed on dual attach card DMA overrun error DMA boundary error CRC error FDC error Seek error FDD not drive Time out error (Not ready) Write buffer error Data compare error Status
Check 1
If the following message displays, disable the write protect tab on the floppy disk. If any other message appears, perform Check 2. Write protected
Check 2
Make sure the floppy disk is formatted correctly. If it is, go to Procedure 3.
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File No. 960-140
Procedure 3
Connector Check and Replacement Check
The FDD, cable and PC card is a single unit. Install the FDD's PC card in the computer, then begin with Check 1 below. Check 1 Make sure the PC card is properly connected to the system board.
If the connection is loose, reinstall the PC card and repeat Procedure 2. If there is still an error, go to Check 2. Check 2 Check 3 The FDD may be defective or damaged. Replace the FDD with a new one. If the FDD is still not functioning properly, perform Check 3. Replace the system board with a new one following the steps in Chapter 4, Replacement Procedures.
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File No. 960-140
1.6
HDD Troubleshooting
This section describes how to determine if the HDD is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required. Procedure 1: Message Check Procedure 2: Partition Check Procedure 3: Format Check Procedure 4: Diagnostic Test Program Execution Check Procedure 5: Connector Check and Replacement Check NOTE: The contents of the hard disk will be erased when the HDD troubleshooting procedures are executed. Transfer the contents of the hard disk to floppy disk or other device. If the customer has not or cannot perform the backup, create backup disks as described below. Check to see if the Microsoft Create System Disks Tools (MSCSD.EXE) still exists in the System Tools Folder. (This tool can be used only once.) If it exists, use it to back up the preinstalled software, then use the Backup utility in the System Tools folder to back up the entire disk, including the user's files. Refer to the operating system instructions.
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File No. 960-140
Procedure 1
Message Check
When the computer's HDD does not function properly, some of the following error messages may appear on the display. Start with Check 1 below and perform the other checks as instructed. Check 1 If any of the following messages appear, go to Procedure 5. If the following messages do not appear, perform Check 2. HDC ERROR (After 5 seconds this message will disappear.) or HDD #0 ERROR (After 5 seconds this message will disappear.) or HDD #1 ERROR (After 5 seconds this message will disappear.) Check 2 If either of the following messages appears, go to Procedure 2. If the following messages do not appear, perform Check 3. Insert system disk in drive Press any key when ready ..... or Non-System disk or disk error Replace and press any key Check 3 Check TSETUP to see whether the Hard Disk option is set to Not used. If it is set to Not used, choose another setting and restart the computer. If the problem still exists, go to Procedure 2.
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File No. 960-140
Procedure 2
Partition Check
Insert the Toshiba MS-DOS system disk and restart the computer. Perform the following checks: Check 1 Check 2 Type C: and press Enter. If you cannot change to drive C, go to Check 2. If you can change to drive C, go to Check 3. Type FDISK and press Enter. Choose Display Partition Information from the FDISK menu. If drive C is listed, go to Check 3. If drive C is not listed, return to the FDISK menu and choose the option to create a DOS partition on drive C. Restart the computer from the Toshiba MS-DOS system disk. If the problem still exists, go to Procedure 3. If drive C is listed as active in the FDISK menu, go to Check 4. If drive C is not listed as active, return to the FDISK menu and choose the option to set the active partition for drive C. Restart the computer. If the problem still exists, go to Check 4. Type DIR C: and press Enter. If the following message displays, go to Procedure 3. If contents of drive C are listed on the display, go to Check 5.
Invalid media type reading drive C Abort, Retry, Fail?
Check 3
Check 4
Check 5
Using the SYS command on the Toshiba MS-DOS system disk, install system files on the HDD. If the following message appears on the display, the system files have been transferred to the HDD. Restart the computer. If the problem still exists, go to Procedure 3.
System transferred
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File No. 960-140
Procedure 3
Format Check
The computer's HDD is formatted using the low level format program and the MS-DOS FORMAT program. To format the HDD, start with Check 1 below and perform the other steps as required. Check 1 Format the HDD and transfer system files using FORMAT C:/S/U. If the following message appears on the display, the HDD is formatted.
Format complete
If an error message appears on the display, refer to the Toshiba MS-DOS Manual for more information and perform Check 2. Check 2 Using the Diagnostic Disk, format the HDD with a low level format option. Refer to Chapter 3, Tests and Diagnostics for more information about the diagnostic program. If the following message appears on the display, the HDD low level format is complete. Partition and format the HDD using the MS-DOS FORMAT command.
Format complete
If you cannot format the HDD using the Tests and Diagnostic program, go to Procedure 4.
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File No. 960-140
Procedure 4
Diagnostic Test Program Execution Check
The HDD test program is stored in the Diagnostics Disk. Perform all of the HDD tests in the Hard Disk Drive Test. Refer to Chapter 3, Tests and Diagnostics, for more information about the HDD test program. If an error is detected during the HDD test, an error code and status will display. The error codes and statuses are listed in Table 2-6. If an error code is not generated and the problem still exists, go to Procedure 5. Table 2-6 Hard disk drive error code and status
Code 01h 02h 04h 05h 07h 08h 09h 0Ah 0Bh 10h 11h 20h 40h 80h AAh BBh CCh E0h EEh DAh Bad command Bad address mark Record not found HDC not reset Drive not initialized HDC overrun (DRQ) DMA boundary error Bad sector error Bad track error ECC error ECC recover enable HDC error Seek error Time out error Drive not ready Undefined error Write fault Status error Access time out error No HDD Status
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File No. 960-140 Procedure 5 Connector Check and Replaceme nt Check
The HDD or system board may be disconnected or damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures and perform the following checks: Check 1 Make sure the HDD is firmly connected to system board.
If any of the connections are loose, reconnect firmly and repeat Procedure 1. If there is still an error, go to Check 2. Check 2 Check 3 The HDD may be damaged. Replace it with a new one following the instructions in Chapter 4. If the problem still exists, perform Check 3. The system board may be damaged. Replace it with a new one following the instructions in Chapter 4.
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File No. 960-140
1.7
Keyboard Troubleshooting
To determine if the computer's keyboard is functioning properly, perform the following procedures. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Diagnostic Test Program Execution Check Procedure 2: Connector and Replacement Check Procedure 1 Diagnostic Test Program Execution Check
Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Test and Diagnostics, for more information on how to perform the test program If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning properly If the external keyboard appears to have the same problem as the internal keyboard, th