Toshiba 730CDT Maintenance Manual
TOSHIBA
730CDT
PN: 730-9400
CATM-3970294-B01
Copyright
©1996 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.
730CDT Maintenance Manual
Third edition, March 1997
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 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.
ii 730CDT
About this Manual
This maintenance manual describes how to perform hardware service maintenance for the
Toshiba Personal Computer 730CDT, referred to as 730CDT in this manual.
The procedures described in this manual are intended to help service technicians isolate faulty
Field Replaceable Units (FRUs) and replace them in the field.
SAFETY PRECAUTIONS
Four types of messages are used in this manual to bring important
information to your attention. Each of these messages will be italicized
and identified as shown below.
DANGER: “Danger” indicates the existence of a hazard that could result in
death or serious bodily injury if the safety instruction is not observed.
WARNING: “Warning” indicates the existence of a hazard that could result
in bodily injury if the safety instruction is not observed.
CAUTION: “Caution” indicates the existence of a hazard that could result in
property damage if the safety instruction is not observed.
NOTE: A Note contains general information that relates to 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 that the
following safety precautions are strictly adhered to:
❑ Be sure to fasten screws securely with the right screwdriver. If a
screw is not fully fastened, it could come loose, creating a danger of a
short circuit, which could cause overheating, smoke or fire.
❑ If you replace the battery pack, 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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iv
The manual is divided into the following parts:
Chapter 1 Hardware Overview
Describes the 730CDT system unit and each FRU.
Chapter 2 Troubleshooting Procedures
Explains how to diagnose and resolve FRU problems.
Chapter 3 Tests and Diagnostics
Describes how to perform tests and diagnostic operations for
maintenance service.
Chapter 4 Replacement Procedures
Describes the removal and replacement of the FRUs.
Appendices The appendices describe the following:
❑ Handling the LCD module
❑ Board layout
❑ Pin assignments
❑ Keyboard scan/character codes
❑ Key layout
❑ Wiring diagrams
❑ BIOS Rewrite Procedures
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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 keytop symbol, as it
appears on the keyboard, is printed in boldface type. For example:
Enter Identifies the Enter key
Key Operation
Some operations require that you simultaneously use two or more keys. We identify
these operations by the keytop symbols separated by a plus (+) sign. For example,
Ctrl + Pause (Break) means you must hold down the Ctrl key, 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 is displayed in the following boldface type:
The Display
Text generated by the 730CDT that appears on its display is presented in the type
face:
DISKCOPY A: B:
Format complete
System transferred
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vi
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1-1
1.1 Features
The Toshiba 730CDT uses extensive Large Scale Integration (LSI) and Complementary
Metal-Oxide Semiconductor (CMOS) technology to provide minimum size and weight, low
power usage and a high degree of reliability. The computer is fully optimized for Windows
95 and supports plug and play technology. The computer incorporates the following features
and benefits:
❑ Microprocessor
This computer uses an Intel® Pentium® 150 MHz processor with Voltage Reduction
Technology (VRT) operating at 3.1/3.3 volts.
❑ Cache memory
The CPU contains a 16 KB cache and a 256 KB level-2 cache with pipe-line burst
SRAM.
❑ Disk storage
®
This computer has a 2.1 billion byte (2.02 GB) removable HDD pack.
❑ Selectable Bay
The Selectable Bay allows connection to either a Floppy Disk Drive (FDD) or a CDROM drive.
The FDD supports 3.5-inch 2HD (1.44 MB) disks and 2DD (720 KB) disks. The FDD
drive can be connected to an external FDD port with an attachment when the CDROM drive is installed in the Selectable Bay.
A full-size, six-speed CD-ROM drive contains an AT Attachment Packet Interface
(ATAPI) controller, and supports the following formats: Red-Book, Yellow-Book,
CD-ROM XA, Photo CD, CD-Bridge, CD-I, and CD Plus.
❑ Memory
This computer comes standard with 16 MB of Extend Data Out (EDO) DRAM. This
includes 640 KB of conventional memory and 15488 KB of extended memory.
❑ Display
The 730CDT has a 12.1-inch, Thin Film Transistor (TFT) color LCD displaying 1024
x 768 pixels. The built-in display controller supports full color capability up to 1280 x
1024 resolution on an external monitor.
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❑ Keyboard
An-easy-to-use 82/84-key keyboard includes a numeric keypad overlay for fast numeric data entry or for cursor and page control. The keyboard supports software that
uses a 101-key or 102-key enhanced keyboard.
❑ Batteries
Three different batteries are used in this computer: a Lithium-Ion main battery, a
backup battery (for memory backup), and a Real Time Clock (RTC) battery.
❑ Expansion memory slot
An optional 8, 16, 32, 64, or 128 MB memory module can be installed in the memory
slot.
❑ Parallel port
This port can be used to connect a Centronics compatible printer or other parallel
device. The port supports Extended Capabilities Port (ECP) conforming to
IEEE·1284.
❑ Serial port
The serial controller is 16550UART compatible. This standard, 9-pin, serial port can
be used to connect serial devices such as a serial printer, serial mouse, or external
modem.
❑ External monitor port
The female, 15-pin, D-shell connector can be connected to an external SVGA monitor. This computer supports Video Electronics Standards Association (VESA) Display
Data Channel (DDC) 2B compatible functions.
❑ PS/2 mouse/keyboard port
Either a PS/2 compatible keyboard or a PS/2 compatible mouse can be connected to
this port.
❑ PC card slot
The PC card slot accommodates two Personal Computer Memory Card International
Association (PCMCIA) 5 mm cards (Type II), or one 10.5 mm (Type III) card which
supports PCMCIA Release 2.01. These slots can also support advanced PC cards,
such as PC Card 16’s multifunction card, CardBus 32-bit card, or a Zoomed Video
(ZV) port, which is dedicated to high-performance video data transfer such as MPEG
video playback. The optional Desk Station V Plus and Enhanced Port Replictor II
support two additional 10.5 mm cards.
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❑ Docking interface port
This 240-pin port allows connection to an Enhanced Port Replicator II or a Desk
Station V Plus.
The Enhanced Port Replicator II duplicates the following ports on the computer: PS/2
keyboard, PS/2 mouse, serial, parallel, external monitor, audio line-in, audio line-out,
headphone, and microphone. It also provides a joystick port and two additional PC
card slots (Type III).
The Desk Station V Plus expands the features of the Enhanced Port Replicator II by
adding two PCI/ISA and one PCI bus expansion slots, a 5.25-inch disk drive bay, a
Selectable Bay, and an on-board SCSI-2 (small computer system interface) controller.
❑ External FDD port
The external FDD port lets you connect an external FDD device when a CD-ROM
drive is installed.
❑ AccuPoint
A pointer control stick, located in the center of the keyboard, provides convenient
control of the cursor without requiring desk space for a mouse.
❑ Serial infrared port
This computer incorporates an IrDA1.0 (infrared data association) standard infrared
transmitter and receiver. It allows cableless data transfer at 115.2 Kbps.
❑ Sound System
The sound system is compatible with Sound BlasterTM Pro
TM
and Windows Sound
System. This computer is equipped with a microphone, stereo speakers, and the
following jacks: audio line-in, audio line-out, headphone, and microphone.
❑ Internal Modem (optional in some markets)
The modem supports V.34 data communication at 28.8 Kbps, V.17 class-1 facsimile
transmissions at 14.4 Kbps, and can be used as a speaker phone and Telephone
Answering Machine (TAM). The computer is equipped with an RJ11 modem jack to
connect directly to a telephone line.
The 730CDT Personal Computer is shown in Figure 1-1 and its system configuration in
Figure 1-2.
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Figure 1-1 730CDT personal computer
Figure 1-2 730CDT system unit configuration
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1.2 System Unit Block Diagram
The following figure shows a block diagram of the system unit.
The system board is composed of the following major components:
❑ Intel Pentium processor operating at 150 MHz and 3.1/3.3 volts. A math co-processor
and 16 KB cache memory are integrated into the processor.
❑ Level-2 cache memory
Data RAM:
- 256 KB
- Two 32K x 32-bit pipe-line burst synchronous SRAM chips
- 3.3 volt operation
- 8 ns access time
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Figure 1-3 System board block diagram
1-6
Tag RAM:
- 32 KB (only 8 KB is used)
- One 32K x 8-bit asynchronous SRAM chip
- 3.3 volt operation
- 15 ns access time
The level-2 cache uses direct mapping, utilizing a write-through policy.
❑ Standard RAM
16 MB, eight 1M x 16-bit EDO DRAM chips
3.3 volt operation
No parity bit
60 ns access time
64-bit width data transfer
❑ BIOS ROM (Flash EEPROM)
256 KB, one 256K x 8-bit chip
- 128 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
- 32 KB are reserved
5 volt operation
120 ns access time
8-bit width data transfer
❑ Optional memory
One expansion memory slot for 8, 16, 32, 64, and 128MB memory modules, which
consist of 1M x 16-bit chips (8, 16, 32MB) and 4M x 16-bit chips (64, 128MB).
EDO DRAM is used
3.3 volt operation
No parity bit
60 ns access time
64-bit width data transfer
❑ Video RAM
2 MB, four 256K x 16-bit EDO DRAM chips
5 volt operation
50 ns access time
❑ System controller Gate Array
This gate array has the following functions:
- CPU interface/control
- Level-2 cache memory control
- DRAM control
- PCI master/slave interface
- Write buffer (CPU-DRAM, CPU-PCI, PCI-DRAM)
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1-7
- Prefetch buffer (PCI-DRAM)
- Two DMACs: 82C37 equivalent
- Two PICs: 82C59 equivalent
- One PIT: 82C54 equivalent
- Serial interrupt function
- Power management control
- Suspend/resume control
- CPU stop clock function
❑ I/O controller Gate Array
This gate array has the following functions:
- Two UARTs 16550A equivalent (one SIO is used for SIR)
- One FDC µPD765A equivalent
- One ECP supported parallel port control
- ISA bus control
- PCI bus front end control
❑ Multiplex Gate Array
This gate array is a multiplexer for a ZV port.
❑ LCD interface Gate Array
This gate array controls data transfer between a VGA controller and LVDS.
❑ PC Card Controller Gate Array
This gate array has the following functions:
- PC card control
- CardBus control
- ZV port support (multiplex gate array control)
❑ Miscellaneous Gate Array
This gate array has the following functions:
- Communication control
Communication with KBC
I2C bus interface
Communication with power supply
Communication with Desk Station V Plus
Communication with EEPROM
Communication register set
- PWM control
Beep volume
- Speaker control
- Universal I/O port
- Q-SW control
❑ Modem interface Gate Array
This gate array controls modem interface LSIs.
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1-8
❑ Video Controller
Chips & Technology F65550 is used.
The video controller controls the internal LCD and an external CRT.
❑ Keyboard Controller (KBC)
One M38802M4 chip is used.
The KBC includes the keyboard scan controller and keyboard interface controller.
The KBC controls the internal keyboard, external keyboard, AccuPoint, or PS/2
mouse.
❑ AccuPoint Controller (IPSC)
One KPAAC0062A chip is used.
The controller provides simultaneous control of both the AccuPoint and a PS/2
mouse.
❑ Real Time Clock (RTC)
One T9934 chip is used.
The T9934 has 128 bytes of memory. Fourteen (14) bytes are used for the calendar
and clock, and the remaining 114 bytes are used for system configuration data.
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1.3 3.5-inch Floppy Disk Drive
The removable 3.5-inch FDD is a thin, high-performance, reliable drive that supports 720-KB
(formatted) 2DD and 1.44-MB (formatted) 2HD disks. When a CD-ROM is installed in the
Selectable Bay, an FDD attachment can be used to connect the FDD to the external FDD
port.
The FDD is shown in Figure 1-4, and its specifications are listed in Table 1-1.
Figure 1-4 3.5-inch FDD
Table 1-1 3.5-inch FDD specifications
Item 2-MB mode 1-MB mode
Storage capacity (KB)
Unformatted 2,000 1,000
Formatted 1,440 720
Number of heads 2 2
Number of cylinders 80 80
Access time (ms)
Track to track 3 3
Average 181 181
Head settling time 15 15
Recording track density (tpi) 135 135
Data transfer rate (Kbps) 500 250
Rotation speed (rpm) 300 300
Recording method Modified Frequency Modulation (MFM)
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1.4 2.5-inch Hard Disk Drive
The removable HDD is a random access, nonvolatile storage device. It has a non-removable
2.5-inch magnetic disk and mini-winchester type magnetic heads.
The 730CDT supports a 2.1 billion (2.02 GB) HDD.
The HDD is shown in Figure 1-5, and its specifications are listed in Table 1-2.
Figure 1-5 2.5-inch HDD
Table 1-2 2.5-inch HDD specifications
Items (MK2101MAN)
Storage capacity (GB) 2,167,603,200
Cylinders 525
Heads 128
Sectors 63
Bytes per sector 512
Rotation speed (rpm) 4,200
Recording method 8-9 RLL
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1-11
1.5 Keyboard
The 82-key (USA) or 84-key (European) keyboard is mounted on the system unit. The
keyboard is connected to the keyboard controller on the system board through a 25-pin flat
cable.
The 730CDT AccuPoint pointer control stick, located in the center of the keyboard, provides
convenient control of the cursor without requiring desk space for a mouse. The keyboard is
shown in Figure 1-6.
See Appendix E for optional keyboard configurations.
Figure 1-6 Keyboard
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1-12
1.6 CD-ROM Drive
The removable CD-ROM drive accommodates both 12 cm (4.72-inch) or 8 cm (3.15-inch)
CDs. It provides high-performance, six-speed play, and reads 900KB per second. The drive
supports the following formats: Red-Book, Yellow-Book, CD-ROM XA, Photo CD, CDBridge, CD-I, and CD Plus.
The CD-ROM drive is shown in Figure 1-7 and its specifications listed in Table 1-3.
Figure 1-7 CD-ROM drive
Table 1-3 CD-ROM drive specifications
Item 1 x mode 6 x mode
Data Capacity (bytes/block)
Mode 1 2,048
Mode 2 2,336
Transfer Rate
Sustained Block transfer speed (blocks/s) 75 450
Sustained Data transfer speed (kbytes/s)
Mode 1 150 900
Mode 2 171 1,026
ATAPI Burst (Mbytes/s) 8.33 (PIO mode 2)
Access time (ms)
Average Random Access 350 190
Average Random Seek 230 160
Average Full Stroke Access 500 330
Rotation speed (rpm) 200 to 530 1,200 to 3,180
Data Buffer Capacity (Kbytes) 128
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1.7 TFT Color LCD
The TFT Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp
(FL), and an FL inverter board.
1.7.1 TFT Color LCD Module
The 730CDT TFT color LCD is backlit supporting 1024x 768 pixels with a built-in display
controller. The controller incorporates functions of the Video Graphics Array (VGA) and
Super VGA (SVGA) for external displays.
The display controller is F65550, and enables an LCD to display a maximum 16 million
colors.
The TFT LCD is shown in Figure 1-8, and its specifications are listed in Table 1-4.
Figure 1-8 730CDT color LCD
Table 1-4 730CDT color LCD specifications
Item Specifications
Number of Pixels (pixels) 1024x 768
Dot pitch (mm) 0.24x 0.24
Display area (mm) 245.76 (W) x 184.32 (H)
Contrast 150:1
FL current (mA) 6.0/4.0/3.6/2.4*
(Bright/Semi-bright)
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1-14
* NOTE: FL currents at power on are:
Bright Semi-bright
AC adapter connected 6 mA 3.6 mA
AC adapter not connected 4 mA 2.4 mA
(The settings at power on do not change even if the AC adapter
connection changes.)
1.7.2 Fluorescent Lamp (FL) Inverter Board
The FL inverter board supplies a high frequency current to light the LCD’s Fluorescent
Lamp.Specifications for the FL inverter are listed in Table 1-5.
Table 1-5 FL inverter board specifications for 730CDT color LCD
Status Item Specifications
Input Voltage (V) 4 to 5.5
Power (W) 4.8
Output Voltage (Vrms) 1,100
Current (mA) 6.0/4.0/3.6/2.4*
*NOTE: FL currents at power on are:
Bright Semi-bright
AC adapter connected 6 mA 3.6 mA
AC adapter not connected 4 mA 2.4 mA
(The settings at power on do not change even if the AC adapter
connection changes.)
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1.8 Power Supply
The Power Supply sends four variations of voltages to the system board, has one microprocessor, and operates at 2 MHz. It offers the following features:
1. Determines if the AC adapter or battery is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the Battery Capacity 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 remaining battery capacity.
8. Detects Ring Indicator (RI) signal for the Auto Power On function.
The power supply output ratings are specified in Table 1-6.
Table 1-6 Power supply board output ratings
Use Name voltage tolerance current Ripple
System logic, FDD, HDD B5V +5.0 ±5 3,400 100
Display panel, FL and
PC card
CPU, RAM, PC card B3V +3.3 ±5 3,800 60
Flash ROM, PC card B12V +12.0 ±5 100 240
System logic MCV +5.0 ±5 5 100
DC Regulation Maximum
(V) (%) (mA) (mV)
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1-16
1.9 Batteries
The computer has three types of batteries:
Main battery pack
❑
❑ Backup battery
❑ Real Time Clock (RTC) battery
The removable main battery pack is the computer’s main power source when the AC adapter
is not attached. The backup and main batteries maintain the current state of the computer
when AutoResume is enabled.
Battery specifications are listed in Table 1-7.
Table 1-7 Battery specifications
Battery name Material Output voltage Capacity
Main battery Lithium-Ion 10.8 V 5,600 mAh
Backup battery Nickel Metal Hydride 7.2 V 35 mAh
RTC battery Nickel Metal Hydride 3.6 V 35 mAh
1.9.1 Main Battery
Battery Charging Control
Battery charging is controlled by a microprocessor that is mounted on the power supply. The
microprocessor controls whether the charge is on or off, and detects a full charge when the
AC adapter and battery are attached to the computer. The system charges the battery using a
quick charge or trickle charge.
❑ Quick Battery Charge
When the AC adapter is attached, there are two types of quick charge: quick charge 1
when the system is powered off, and quick charge 2 when the system is powered on.
Table 1-8 Time required for quick charges
Status Charging time
Quick charge 1 4 hours
(power off)
Quick charge 2 4.5 to 12.5 hours
(power on)
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1-17
NOTES 1: The time required for quick charge 2 is affected by the amount
of power the system is consuming. Use of the fluorescent lamp
and frequent disk access diverts power and lengthens the charge
time.
2: Using quick charge 1, the system CPU automatically stops the
charge after five hours and 30 minutes regardless of the
condition of the battery.
If one of the following occurs, the battery quick charge process stops.
1. The battery becomes fully charged.
2. The AC adapter or battery is removed.
3. The 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.
❑ Detection of full charge
A full charge is detected only when the battery is charging at quick charge and is
detected under any of the following conditions:
1. The current in the battery charging circuit drops under the fixed limit.
2. The charging time exceeds the fixed limit.
3. The battery’s temperature is over 60°C.
1.9.2 Backup Battery
The backup battery maintains data for AutoResume. The power source used to back up the
AutoResume data is determined by the following priority:
AC adapter > Main battery > Backup battery
The backup battery is charged by the main battery or AC adapter. Table 1-9 lists the charging
time and data preservation period of the backup battery.
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Table 1-9 Backup battery charging/data preservation time
Status Time
Charging Time 7 hours with AC adapter
14 hours without AC adapter
Data preservation period (full charge) 2 hours
1.9.3 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 1-10 lists the charging time and data preservation period for the RTC battery.
Table 1-10 RTC battery charging/data preservation time
Status Time
Charging Time (Power On) 40 hours
Data preservation period (full charge) 1 month
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2.1 Troubleshooting
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the computer is
causing it to malfunction. FRUs covered include the:
1. System (FLXSY*) Board 7. Floppy Disk Drive
2. Modem (FLXCY*) Board 8. Hard Disk Drive
3. Jack (FLXJK*) Board 9. CD-ROM Drive
4. IPS (FLXIP*) Board 10. Keyboard
5. Power Supply (FSTPS*) Board 11. Display
6. DAA (FLXDA*) Board
NOTE: The DAA (FLXDA*) Board is standard equipment in Canada and the
United States, and an option in Europe.
The Diagnostics Disk operations are described in Chapter 3 and detailed replacement procedures 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. A 2DD or 2HD formatted work disk used for floppy disk drive testing
5. Cleaning kit for floppy disk drive troubleshooting
6. Printer port LED
7. Printer wraparound connector
8. Serial port wraparound connector
9. PC card wraparound card
10. Multimeter
11. External monitor
12. PS/2 or compatible keyboard
13. PS/2 or compatible mouse
14. Multimedia sound system with line-in and line-out ports
15. Headphone
16. Microphone
17. Speakers with amplifier
18. External FDD attachment
19. Lens cleaner for the CD-ROM drive troubleshooting.
20. Toshiba-EMI Test Disc TDY-3.
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2.2 Troubleshooting Flowchart
Use the flowchart shown in Figure 2-1 as a guide to determine which troubleshooting procedures to execute. Before proceeding through the flowchart steps:
❑ Ask the user if a password is registered and, if it is, ask him or her to enter the pass-
word. If the user has forgotten the password, 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 MS-DOS or Toshiba Windows
®
95 is installed
on the hard disk. Non-Toshiba operating systems can cause the computer to malfunction.
❑ Make sure all optional equipment is disconnected from the computer.
❑ Make sure the floppy disk drive is empty.
Figure 2-1 Troubleshooting flowchart (1/2)
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If the diagnostics program cannot detect an error, the problem may be intermittent. The
Running Test program should be executed several times in order to isolate the problem.
Check the Log Utilities function to confirm which diagnostic test detected an error(s), 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, execute the system board/
PCB procedures outlined in Section 2.4.
2. If an error is detected on the floppy disk test, execute the floppy disk drive
troubleshooting procedures outlined in Section 2.5.
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Figure 2-1 Troubleshooting flowchart (2/2)
2-4
3. If an error is detected on the hard disk test, perform the hard disk drive
troubleshooting procedures outlined in Section 2.6.
4. If an error is detected on the keyboard test, execute the keyboard troubleshooting
procedures outlined in Section 2.7.
5. If an error is detected on the display test, execute the display troubleshooting
procedures outlined in Section 2.8.
6. If an error is detected on the CD-ROM test, execute the CD-ROM drive troubleshooting procedures outlined in Section 2.9.
7. If an error is detected on the modem test, execute the modem troubleshooting
procedures outlined in Section 2.10.
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2.3 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 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 using the Battery and the DC
IN icons as shown in the following tables.
Table 2-1 Battery icon
Battery icon Power supply status
Lights yellow Quick charge.
Lights green Battery has a full charge and the AC adapter is
connected.
Blinks yellow The battery level becomes low while operating the
(even intervals) computer on battery power.
Flashes yellow The power switch is pressed on when the battery
level is low.
Doesn't light Any condition other than those above.
*1
AutoResume Off will be executed soon.
*2
AutoResume Off has already been executed.
*2
*1
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Table 2-2 DC IN icon
DC IN icon Power supply status
Lights green DC power is being supplied from the AC adapter,
or Desk Station V Plus.
Blinks green Power supply malfunction.
Doesn't light Any condition other than those above.
*3
When the power supply controller detects a malfunction, the DC IN icon
*3
blinks and an error code is displayed.
To check the power supply status, install a battery pack and connect an AC adapter.
Check 1 If the DC IN icon flashes yellow, go to Procedure 2.
Check 2 If the DC IN icon does not light, go to Procedure 3.
Check 3 If the Battery icon does not light yellow or green, go to Procedure 4.
Procedure 2 Error Code Check
If the microprocessor detects a malfunction, the DC IN icon blinks yellow. The blink pattern
indicates an error, as shown below.
❑ Start Off for 2 seconds
❑ Error code (8 bit)
"1" On for one second
"0" On for a half second
Interval between data bits Off for a half second
An error code begins with the least significant digit.
Example: Error code 12h (error codes are displayed in a hexadecimal format.)
Check 1 Convert the DC IN icon blink pattern into the hexadecimal error code and com-
pare it to the following tables.
730CDT
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