Toshiba Satellite Pro 420CDT User manual

420 Series 1-1
1.1 Features
The 420CDT/420CDS (420 Series) is one of the lightest and most advanced portable comput-
ers available. Utilizing advanced technology and high-speed components, the 420 series
offersmultimediafunctions,excellentdisplaylegibility,batteryoperation,andIBMPC/AT
compatibility. The 420 series system unit consists of the following features:
❑Microprocessor
An Intel Pentium processor with Voltage Reduction Technology (VRT) that operates
at 100 MHz and 3.3/2.9 volts.
❑Disk storage
The 420CDT has an internal 1.3 billion byte (1.26 GB) or 810 million byte (770 MB)
Hard Disk Drive (HDD). The 420CDS has an internal 810 million byte HDD. A 3.5-
inch Floppy Disk Drive (FDD) supports 2HD (1.44 MB) floppy disks and 2DD (720
KB) floppy disks. The FDD can also be installed in an attachment for connection as an
externaldevice.
❑CD-ROM Drive
A full-size, six-speed CD-ROM drive module can be installed instead of the FDD
module. The CD-ROM drive contains an ATAPI (AT attachment packet interface)
interface controller, and supports the following formats: audio CD, photo CD, CD-
plus, and ISO 9660.
❑Memory
Standard with 8 MB of CMOS RAM. This includes 640 KB of conventional memory
and 7360 KB of extended memory, which can be utilized as expanded memory com-
patible with the Lotus/Intel/Microsoft Expanded Memory Specification (LIM-EMS).
❑Display
The 420CDT has an 11.3-inch, Thin Film Transistor (TFT) color LCD with 800 x 600
pixels. The 420CDS has an 11.3-inch Dual-scan Supertwist Nematic (DSTN) color
LCD with 800 x 600 pixels. The built-in display controller supports 800 x 600 resolu-
tion with 16M colors capability and up to 1280 x 1024 resolution with 256 colors on
an external CRT.
❑Keyboard
An-easy-to-use 82/84-key keyboard provides a numeric keypad overlay for fast nu-
meric data entry or for cursor and page control. The keyboard supports software that
uses a 101- or 102-key enhanced keyboard.

1-2 420 Series
❑Batteries
Three different batteries: an Li-Ion main battery, a backup battery (for memory
backup), and an RTC battery (for Real Time Clock).
❑Expansionmemoryslot
An optional 8, 16, or 32 MB memory module can be installed in the memory slot.
❑Parallel port
Can be used to connect a Centronics compatible printer or other parallel device. The
port supports ECP (Extended Capabilities Port) conforming to IEEE·1284.
❑Serial port (9-pin)
The serial controller is 16550UART compatible. This port can be used to connect such
serial devices 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.
❑PS/2 mouse/keyboard port
Either a PS/2 compatible keyboard or a PS/2 compatible mouse can be connected to
this port. The computer automatically recognizes which device is connected.
❑FDD port
Enables a connection of the external FDD attachment if the CD-ROM module is
installedinsidethesystemunit.
❑PC card slot
A PC card slot accommodates two 5mm cards (Type II) or one 10.5mm (Type III)
card, which support PCMCIA Release 2.01 cards. These slots also support advanced
cards, including PC Card 16 multifunction cards as well as the Zoomed Video (ZV)
port, which is dedicated to high-performance video data transfer such as MPEG video
playback.
❑Enhanced port replicator port
Enables connection of an enhanced port replicator. The enhanced port replicator has
two PC card slots (Type III), and expands connections to the following devices: PS/2
keyboard, PS/2 mouse, serial port, parallel port, external CRT, joystick/MIDI port,
audio line-in, audio line-out, headphone, external FDD, AC-in, AC-out, and rotary
switch (ID select switch).
❑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.

420 Series 1-3
❑Infrared port
Incorporates an IrDA1.0 (115.2Kbps supported) standard infrared transmitter and
receiver.
❑Sound System
A Sound Blaster Pro compatible sound system provides capability to record sound and
play it back with a built-in microphone and speaker. The sound system is equipped
with a volume control dial, headphone jack, microphone jack, and audio line-in jack.
The 420 Series Personal Computer is shown in Figure 1-1.
Figure 1-1 420 series personal computer
The 420 system configuration is shown in Figure 1-2.
Figure 1-2 420 system unit configuration

1-4 420 Series
1.2 System Unit Block Diagram
Figure 1-3 is a block diagram of the 420 series system unit.
Figure 1-3 420 series system board block diagram

420 Series 1-5
The 420 series system board is composed of the following major components:
❑Microprocessor
One Intel Pentium processor with VRT 64-bit microprocessor
Intel Pentium processor operates at 100 MHz and 3.3/2.9 volts
❑Standard RAM
8 MB, four 1Mx16-bit chips
3.3 volt operation
No parity bit
Access time 60 ns
Data transfer is 64-bit width
EDO (extended data output) supported
❑BIOS ROM (Flash EEPROM)
128 KB (one 128Kx8-bit chip) memory
64 KB in the ROM are used for system BIOS
40 KB in the ROM are used for VGA BIOS
24 KB in the ROM are reserved
Access time 150 ns
Data transfer is 8-bit width
❑Video RAM
2 MB (Four 256Kx16-bit DRAM)
5 volt operation
❑Optionalmemory
One expansion memory slot is available for 8, 16, and 32 MB memory modules, which
consist of some 1 MBx16-bit chips.
Total maximum memory size is 40 MB (if a 32 MB memory module is installed).
3.3 volt operation
No parity bit
Access time 60 ns
Data transfer is 64-bit width
EDO (extended data output) supported
❑One super integration (SI)
Thefollowing components:
- Two DMACs 82C37equivalent
- Two PICs 82C59equivalent
- Two UART 16550equivalent
- One PIT 82C54equivalent
- One FDC TC8565equivalent
- One VFO TC8568equivalent
- One I/O port decode
- One SIO port control
- One printer port control supported ECP
- One FDD control
- One speaker control
- One power communication control

1-6 420 Series
❑System Controller Gate Array (SCPCNT-GA)
This gate array has the following functions:
• CPU control
- SMI control
- CPU clock control
• Memory control
- 64-bit bus memory control
- 32-bit bus memory control
• Bus control
- 64-bit data bus <==>32-bit data bus
- 32-bit local bus control
• Address latch control
• I/O register control
• Processing speed control
❑ISA Bus Controller Gate Array (SISCNT-GA)
This gate array has the following functions:
• Bus control
- 32-bit data bus <==> 16-bit data bus
- ISA bus interface control
- ISA bus access control
- DMAC control
- DMA address generation
- I/O control
- Suspend/Resumesequence
• Memory control
- ISA bus interface control
- Refresh address generation
• I/O register control
• Suspend/Resumesequence
❑PC Card Controller Gate Array
This gate array has the following functions:
• PCMCIA memory card control
• PCMCIA I/O card control
❑I/O Controller Gate Array (IOCNT-GA)
This gate array has the following functions:
• InternalCommunicationcontroller
- KBC, main CPU communication register file
- KBC interrupt controller
- KBCcommunicationcontroller
-I
2
C bus control

420 Series 1-7
• Others
- Speaker volume adjust PWM control
- Sound board interface
- BIOS-ROMinterface
- SMI control
- IrDA (SIR) control
❑Video Controller
Chips & Technologies F65550 is used
This video controller controls internal TFT/DSTN color LCD and external SVGA
compatibleCRT.
❑Keyboard Controller (KBC)
One M38802M4 chip is used
This KBC includes the keyboard scan controller and keyboard interface
controller. The KBC controls the internal keyboard, external keyboard, and
PS/2 mouse.
❑AccuPoint Controller (IPSC)
One KPAAC0062A chip is used
This 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 bytes of memory are used for the
calendar and clock. The remaining 114 bytes are used for the system configuration
data.

1-8 420 Series
1.3 3.5-inch Floppy Disk Drive
The 420 series 3.5-inch removable FDD is a thin, high-performance reliable drive that sup-
ports 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 an
external FDD port.
The 420 series FDD is shown in Figure 1-4.
Figure 1-4 3.5-inch FDD
The specifications for the FDD are listed in Table 1-1.
Table 1-1 3.5-inch FDD specifications
Item 2-MB mode 1-MB mode
Storage capacity (KB)
Unformatted 2,000 1,000
Formatted 1,475 737
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)

420 Series 1-9
1.4 2.5-inch Hard Disk Drive (HDD)
The Hard Disk Drive is a random access non-volatile storage device. It has a non-removable
2.5-inch magnetic disk and mini-winchester type magnetic heads.
The 420CDT supports 1.3 billion bytes (1.26GB) and 810 million bytes (770MB).The
420CDS supports 810 million bytes (770MB).
The 420 series is shown in Figure 1-5.
Figure 1-5 2.5-inch HDD
Specifications for the HDD are listed in Table 1-2.
Table 1-2 2.5-inch HDD specifications
770 MB 1.26 GB
Items MK1926FCV DSOA-20810 MK1301MAV
Formatted capacity (byte) 814,915,584 812,851,200 1,358,880,768
Number of disks 3 2 3
Logical heads 16 16 16
Logical cylinders 1,579 1,575 2,633
Bytes per sector 512 512 512
Rotation speed (rpm) 4,200 4,000 4,200

1-10 420 Series
1.5 Keyboard
The 82-(USA) or 84-(European) key keyboard is mounted on the 420 series system unit. The
keyboard is connected to the keyboard controller on the system board through a 25-pin flat
cable. The 420 series 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

420 Series 1-11
1.6 CD-ROM Drive
The 420 series internal CD-ROM drive accommodates either a 12 cm (4.72-inch) or an 8 cm
(3.15-inch) CD. It provides high-performance six-speed play (reads 900KB per second).
This drive supports the following formats:
Audio CD
Photo CD
ISO 9660
CD Plus
The CD-ROM drive is shown in Figure 1-7.
Figure 1-7 CD-ROM
The specifications for the CD-ROM drive are listed in Table 1-3.
Table 1-3 CD-ROM specifications
Item 1X mode 6X mode
Data Capacity (bytes/block)
Mode 1 2,048
Mode 2 2,336
Rotational Speed (rpm) 200 to 530 1,200 to 3,180
Transfer Rate
Sustained Block Transfer (blocks/s) 75 450
Sustained Data Transfer (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
Data Buffer Capacity (Kbytes) 128

1-12 420 Series
1.7 DSTN Color LCD (420CDS)
The DSTN Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent
Lamp (FL), and an FL inverter board.
1.7.1 DSTN Color LCD Module
The DSTN color LCD is backlit and supports 800x600 pixels with built-in display controller.
This controller includes the functions of Video Graphics Array (VGA) and Super VGA
(SVGA) for external display.
A display controller is F65550. This controller enables an LCD display of a maximum 64K
colors.
The DSTN LCD is shown in Figure 1-8.
Figure 1-8 DSTN color LCD
The specifications for the LCD are listed in Table 1-4.
Table 1-4 DSTN color LCD specifications
Item Specifications
Number of Dots (dots) 800x600
Dot pitch (mm) 0.288x0.288
Display area (mm) 229.2 (W)x171 (H)
Contrast (Typically) 27:1
FL current (mA) 5.0/3.0
(Bright/Semi-bright)

420 Series 1-13
1.7.2 DSTN Color Fluorescent Lamp (FL) Inverter Board
The FL inverter board supplies high frequency current to light the LCD Fluorescent Lamp.
The specifications for the FL inverter are listed in Table 1-5.
Table 1-5 DSTN color FL inverter board specifications
Item Specifications
Input Voltage (V) 4 to 5.5
Power (W) 4.25
Output Voltage (Vrms) 1,100
Current (mA) 5.0/3.0
(Bright/Semi-bright)

1-14 420 Series
1.8 TFT Color LCD (420CDT)
The TFT Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp
(FL), and an FL inverter board.
1.8.1 LCD Module
The TFT color LCD is backlit and supports 800x600 pixels with built-in display controller.
This controller includes the functions of VGA and SVGA for external display.
A display controller is F65550. This controller enables an LCD display of a maximum 16M
colors.
The TFT LCD is shown in Figure 1-9.
Figure 1-9 TFT color LCD
The specifications for the LCD are listed in Table 1-6.
Table 1-6 TFT color LCD specifications
Item Specifications
Number of dots (dots) 800x600
Dot pitch (mm) 0.288 (W)x0.288 (H)
Display area (mm) 229.2 (W)x171 (H)
Contrast (minimum) 100:1
FL current (mA) 2.4/2.8/4.0/4.6
*NOTE: The FL currents at power on are:
Bright Semi-bright
AC cord connected 4.6 mA 4.0 mA
AC cord not connected 2.8 mA 2.4 mA
(The settings at power on do not change even if the AC cord connection changes.)

420 Series 1-15
1.8.2 Fluorescent Lamp (FL) Inverter Board
The FL inverter board supplies high frequency current to light the LCD Fluorescent Lamp.
The specifications for the FL inverter are listed in Table 1-7.
Table 1-7 FL inverter board specifications
Item Specifications
Input Voltage (V) 4 to 5.5
Power (W) 4.25
Output Voltage (Vrms) 1,100
Current (mA) 2.4/2.8/4.0/4.6
*NOTE: The FL currents at power on are:
Bright Semi-bright
AC cord connected 4.6 mA 4.0 mA
AC cord not connected 2.8 mA 2.4 mA
(The settings at power on do not change even if the AC cord connection changes.)

1-16 420 Series
1.9 Power Supply
The power supply provides five kinds of voltages to the 420 series system board. The 420
series power supply has one microprocessor and it operates at 500 KHz. It contains the
followingfunctions:
1. Determines if the AC cable or battery is connected to the computer.
2. Detects AC output and circuit malfunctions.
3. Controls the LED icon and speaker.
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. Calculatestheremainingbatterycapacity.
The power supply output rating is specified in Table 1-8.
Table 1-8 Power supply output rating
DC Regulation
Use for Name voltage tolerance
(%)
System logic, FDD, HDD, VCC +5 ±5
Display
CPU CPUV +2.9 ±5
Flash ROM, PC card 12V +12 ±5
CPU, RAM, GA B3V +3.3 ±0.3V
VRAM, GA B5V +4.7 ±5

420 Series 1-17
1.10 Batteries
The 420 series has three types of batteries:
❑Main battery pack
❑Backup battery
❑Real Time Clock (RTC) battery
Battery specifications are listed in Table 1-9.
Table 1-9 Battery specifications
Battery name Material Output voltage Capacity
Main battery Lithium-Ion 10.8 V 3,600 mAH
Backup battery Nickel Metal Hydride 7.2 V 110 mAH
RTC battery Nickel Metal Hydride 3.6 V 30 mAH
1.10.1 Main Battery
The removable main battery pack is the computer’s main power source when the AC power
cord is not attached. The main battery recharges the backup battery. The backup and main
batteries maintain the state of the computer when you enable AutoResume.
❑Battery Icon
The Battery icon is located on top of the back rim of the 420 series. The icon shows
the status of the removable battery pack.
The status of each can be determined by color:
Orange The battery is being charged. (AC power cord is attached.)
Green The battery is fully charged. (AC power cord is attached.)
Blinkorange The battery is low when the power is on.
No light Under any other conditions, the LED does not light.
1.10.2 Battery Charging Control
Battery charging is controlled by a power supply 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 power cord and battery are attached to the computer. The system
charges the battery using quick charge or trickle charge.

1-18 420 Series
❑Quick Battery Charge
When the AC power cord is attached, there are two types of charge: quick charge
when the system is powered off and trickle charge when the system is powered on.
Table 1-10 Time required for quick charges
Charging time
Power off About 2 to 3 hours
Power on About 5 to 8 hours
If one of the following occurs, the battery quick-charge process stops:
1. The battery becomes fully charged.
2. The battery is removed.
3. The battery or AC output voltage is abnormal.
4. The charge current is abnormal.
❑Trickle Battery Charge
When the main battery is fully charged and the AC power cord is attached, the power
supply microprocessor automatically changes from quick charge to trickle charge.
1.10.3 Backup Battery
The backup battery maintains data for AutoResume. The power source used to back up the
AutoResume data is determined according to the following priority:
AC power > Main battery > Backup battery
The backup battery is charged by the main battery or AC power cord. Table 1-11 shows the
charging time and data preservation period of the backup battery.
Table 1-11 Backup battery charging/data preservation time
Time
Charging Time Power On 20 H
Power Off 20 H
Data preservation period (full charge) 4 H

420 Series 1-19
1.10.4 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 1-12 shows the charging time and data
preservation period of the RTC battery.
Table 1-12 RTC battery charging/data preservation time
Time
Charging Time With AC power 48 H
or main battery
Data preservation period (full charge) 1 month

420 Series 2-1
2.1 Troubleshooting
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the 420 series is
causing the computer to malfunction. The FRUs covered are:
1. System Board(s)
2. Sound Board
3. VGA Board
4. FloppyDisk Drive
5. Hard Disk Drive
6. CD-ROM Drive
7. Keyboard
8. Display
9. Power Supply
The Diagnostics Disk operations are described in Chapter 3 and detailed replacement proce-
dures are given in Chapter 4.
The following tools are necessary for implementing the troubleshooting procedures:
1. DiagnosticsDisk
2. Phillipsscrewdriver (2mm)
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. RS-232-C wraparound connector
7. Printer wraparound connector
8. Multimeter
9. External CRT
10. PS/2 or compatible keyboard
11. PS/2 or compatible mouse
12. Serial port wraparound connector
13. PC card wraparound card
14. Multimedia sound system with line-in and line-out ports
15. Headphone
16. CD-ROM drive
17. Toshiba EMI test disk TDY-03
18. Music CD
19. Lens cleaner for CD ROM laser pickup lens