Toshiba satellite 100cs, satellite 110cs Service Manual

1.1 Features

The 100CS is one of the lightest and most advanced portable computers available. Utilizing advanced technology and high-speed components, the computer offers multimedia functions, excellent display legibility, battery operation, and IBM PC/AT compatibility. The unit consists of the following features:

❑ Microprocessor

A Pentium® processor with Voltage Reduction Technology (VRT) that operates at 75 MHz and 3.3/2.9 volts.

❑ Memory

Standard 8 MB of CMOS RAM. This includes 640 KB of conventional memory and 7360 KB of extended memory.

❑ Hard Disk Drive (HDD)

An internal 528 million byte (520MB) HDD.

❑ Floppy Disk Drive (FDD)

A 3.5-inch FDD supports 2HD (1.44 MB) floppy disks and 2DD (720 KB) floppy disks.

❑ Display

A 10.4-inch Dual-scan Supertwist Nematic (DSTN) color LCD with 640 x 480 pixels. The built-in display controller supports 640 x 480 resolution with 64k colors capability on the internal LCD and up to 1024 x 768 resolution with 256 colors on an external CRT.

❑ Keyboard

An easy-to-use 82/84-key keyboard provides a numeric keypad overlay for fast numeric data entry or for cursor and page control. The keyboard supports software that uses a 101- or 102-key enhanced keyboard.

❑ Batteries

Three different batteries: a main battery, a backup battery (for memory backup), and an RTC battery (for Real Time Clock).

❑ Expansion memory slot

An optional 8, 16, or 32 MB memory module can be installed in the memory slot.

100CS 1-1

❑ Parallel port

This 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.

❑ RGB port

The female, 15-pin, D-shell connector can be connected to an external SVGA monitor.

❑ Ext. Keyboard/Mouse 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.

❑ PC card slot

A PC card slot supports up to two Personal Computer Memory Card International Association (PCMCIA) standard version release 2.0 cards. The upper and lower slots can each accommodate one Type II (5.0 mm) card, or the lower slot can accommodate one Type III (10.5 mm) card when the upper slot is empty.

❑ Enhanced port replicator port

This 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, AC-in, and AC-out. The NoteDock does not support the following ports: floppy disk, audio in - audio out, joystick, and selectable ID.

❑ 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.

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The 100CS Personal Computer is shown in figure 1-1.

Figure 1-1 100CS personal computer

The system configuration is shown in figure 1-2.

Figure 1-2 System unit configuration

100CS 1-3

1.2 System Unit Block Diagram

Figure 1-3 is a block diagram of the system unit.

Figure 1-3 System board block diagram

1-4 100CS

The system board is composed of the following major components:

❑ Microprocessor

One Pentium processor with VRT 64-bit microprocessor Pentium processor operates at 75 MHz and 3.3/2.9 volts The math co-processor and 16KB cache memory are integrated into Pentium

❑ Standard RAM

8 MB, four 1Mx16-bit chips

3.3 volt operation No parity bit Access time 70 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 48 KB in the ROM are used for VGA BIOS 16 KB in the ROM are reserved Access time 150 ns Data transfer is 8-bit width

❑ Video RAM

1 MB (Two 256Kx16-bit DRAM) 5 volt operation

❑ Optional memory

One expansion memory slot is available for 8, 16, and 32 MB memory modules, which consist of 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)

The following components:

- Two DMACs 82C37 equivalent

- Two PICs 82C59 equivalent

- Two SIOs 16550 equivalent (One SIO is not used)

- Two UARTs 16550 equivalent

- One PIT 82C54 equivalent

- One FDC TC8565 equivalent

- One VFO TC8568 equivalent

- One I/O port decoder

- One SIO port control

- One printer port control supported ECP

- One FDD control

- One speaker control

- One power communication control

100CS 1-5

❑ 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 (SISCNT3-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/Resume sequence

• Memory control

- ISA bus interface control

- Refresh address generation

• I/O register control

• Suspend/Resume sequence

❑ PC Card Controller Gate Array (PCMCIA CNT-GA)

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:

• Internal Communication controller

- KBC, main CPU communication register file

- KBC interrupt controller

- KBC communication controller

- I2C bus control (Not used)

• Others

- Speaker volume adjust PWM control

- Sound board interface (Not used)

- BIOS-ROM interface

- SMI control

- IrDA (SIR) control (Not used)

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❑ Video Controller

C&T F65548 is used. This video controller controls internal DSTN color LCD and external SVGA compatible CRT.

❑ 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, 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.

100CS 1-7

1.3 3.5-inch Floppy Disk Drive

The 3.5-inch FDD is a thin, high-performance reliable drive that supports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks.

The 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 1,000 *2

Formatted 1,311 655 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) *1:32 sector/track (256bytes per sector) *2:16 sector/track (256bytes per sector)

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1.4 2.5-inch Hard Disk Drive

The HDD 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 computer supports the 520 MB.

The HDD is shown in figure 1-5.

Figure 1-5 2.5inch HDD

Specifications for the HDD are listed in table 1-2.

Table 1-2 2.5-inch HDD specifications

Items Toshiba MK1924FCV IBM DBOA-2528

Storage capacity (million byte)

Formatted 528 528

Number of disks 2 2

Data heads 4 3

Data surfaces 4 4

Bytes per sector 512 512

Rotation speed (rpm) 4200 4000

Recording method 8-9 RLL 1-7 RLL

100CS 1-9

1.5 Keyboard

The 82-(USA) or 84-(European) keyboard is mounted on the computer’s system unit. The keyboard is connected to the keyboard controller on the system board through a 25-pin flat cable. The computer 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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1.6 DSTN Color LCD

The DSTN Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp (FL), and an FL inverter board.

1.6.1 DSTN Color LCD Module

The DSTN color LCD is backlit and supports 640 x 480 pixels with a Video controller. This video controller includes the functions of Video Graphics Array (VGA). The built-in display controller supports 640 x 480 resolution with 64k colors capability on the internal LCD and up to 1024 x 768 resolution with 256 colors on an external CRT.

The LCD receives vertical and horizontal synchronizing signals, 16-bit data signal, 8-bit upper block data signal, 8-bit lower block data signal, and has a shift clock for data transmission. All signals are CMOS-level compatible.

The DSTN LCD is shown in figure 1-7. The specifications for the LCD are listed in table 1-3.

Figure 1-7 DSTN color LCD

Table 1-3 DSTN color LCD specifications

Item Specifications

Number of Dots (dots) 640x480 Dot pitch (mm) 0.33x0.33 Display area (mm) 217.2 (W)x164.4 (H) Contrast (Typically) 20:1

FL current (mA) 5.0/3.0

(Bright/Semi-bright)

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1.6.2 DSTN Color Fluorescent Lamp (FL) Inverter Board

The FL inverter board supplies high frequency current to light the LCD’s Fluorescent Lamp.

The specifications for the FL inverter are listed in table 1-4.

Table 1-4 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)

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1.7 Power Supply

The power supply provides five kinds of voltages to the system board. The power supply has one microprocessor, operates at 500 KHz, and performs the following functions:

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. Calculates the remaining battery capacity.

The power supply output rating is specified in table 1-5.

Table 1-5 Power supply output rating

Use for Name voltage tolerance

System logic, FDD, HDD, VCC +5 ±5 Display

CPU CPUV +2.9 ±5 Flash ROM, PCMCIA 12V +12 ±5 CPU, RAM, GA B3V +3.3 ±0.3V VRAM, GA B5V +4.7 ±5

DC Regulation

(%)

100CS 1-13

1.8 Batteries

The computer has three types of batteries:

❑ Main battery pack ❑ Backup battery ❑ Real Time Clock (RTC) battery

Battery specifications are listed in table 1-6.

Table 1-6 Battery specifications

Battery name Material Output voltage Capacity

Main battery Nickel Metal Hydride 12 V 2,600 mAH Backup battery Nickel Metal Hydride 7.2 V 110 mAH RTC battery Nickel Metal Hydride 3.6 V 30 mAH

1.8.1 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 battery 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 computer. The icon shows the status of the removable battery pack.

The status of each can be determined by color:

Orange The AC power cord is connected and charging the battery with the

power off.

Green The AC power cord is connected and the battery is fully charged

whether the power is on or off.

Blink orange The battery is low. The AC power cord must be connected to recharge

the battery.

No light Under any other conditions, the LED does not light.

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1.8.2 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.

❏ 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 1-7 Time required for quick charges

Power Charging time

Power off About 2.5 hours

Power on Trickle charge

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.

5. The fixed time limit for quick charge is exceeded.

❏ 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.

100CS 1-15

1.8.3 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 1-8 shows the charging time and data preservation period of the backup battery.

Table 1-8 Backup battery charging/data preservation time

Item Time

Charging Time Power On 20 H

Power Off (with AC power) 20 H Power Off (without AC power) Doesn’t charge

Data preservation period (full charge) 5 H

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 1-9 shows the charging time and data preservation period of the RTC battery.

Table 1-9 RTC battery charging/data preservation time

Item Time

Charging Time With AC power 48 H

or main battery

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 the computer to malfunction. The FRUs covered are:

1. System Board(s)

2. VGA Board

3. HDD I/F Board

4. Floppy Disk Drive

5. Hard Disk Drive

6. Keyboard

7. Display

The Diagnostics Disk operations are described in Chapter 3 and detailed replacement procedures are given in Chapter 4.

The following tools are necessary for implementing the troubleshooting procedures:

1. Diagnostics disk

2. Phillips screwdriver

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

100CS 2-1

2.2 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, do the following:

❑ Verify with the customer that Toshiba MS-DOS 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.

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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(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, 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 floppy disk drive troubleshooting procedures in section 2.5.

3. If an error is detected on the hard disk test, perform the hard disk drive troubleshooting procedures in section 2.6.

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 2.8.

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2.3 Power Supply Troubleshooting

The computer’s power supply controls many functions and components in the computer. 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: AC IN Icon Check

Procedure 2: Battery Icon Check

Procedure 3: AC PS Unit Replacement Check

Procedure 1 AC IN Icon Check

The AC PS unit converts AC power to DC power and contains a charging circuit which charges the computer’s batteries. The AC power cord connects to the AC IN socket connector on the back side of the computer. When the AC power cord is connected to the 100CS, the AC PS unit charges the batteries.

The AC IN icon displays whether or not the AC power cord is connected and supplying power.

When the AC IN icon is green, the AC power cord is connected and supplying power to the computer.

If the AC IN icon does not light, the AC power cord is not supplying power to the computer or the AC power cord is not attached to the computer. Go to Check 1.

If the AC IN icon is flashing orange, the AC power cord’s voltage supply is abnormal or the power supply is not functioning properly. Go to Check 1.

If any of the above indicator conditions are abnormal, make sure the icon lights are not burned out before performing the following checks:

Check 1 Make sure the correct AC power cord is firmly plugged into the AC IN socket on

the back of the computer.

Check 2 If the AC IN icon flashes orange when the AC power cord is connected, output

voltage is abnormal. Connect a new AC power cord and turn the computer on again to verify the indicator condition.

Check 3 The battery pack may be malfunctioning. Replace the battery pack with a new one

and turn the computer on again. If the problem still exists, go to Procedure 2.

100CS 2-5

Procedure 2 Battery Icon Check

The Battery icon shows the battery charging status. The Battery icon glows orange when the AC power cord is charging the computer’s battery pack.

If the Battery icon glows green, the AC power cord is connected and the battery is fully charged.

If the Battery icon glows orange, the AC power cord is connected and the battery is being charged.

If the Battery icon does not glow, go to Check 1.

Check 1 Make sure the AC power cord is firmly plugged into the AC IN socket and wall

outlet. If these cables are connected correctly, go to Check 2.

Check 2 Make sure the battery pack is installed in the computer correctly. If the battery

pack is installed correctly, go to Check 3.

Check 3 Remove the battery pack and check that the battery terminal is clean and not bent.

If the terminal appears dirty, clean it gently with a cotton swab dipped in alcohol.

If the terminal looks bent or damaged, replace the system board.

If the battery terminal is clean and not bent, go to Check 4.

Check 4 Connect a new AC power cord. If the Battery icon still does not glow, go to

Check 5.

Check 5 Install a new battery pack. If the Battery icon still does not glow, go to Procedure

Procedure 3 AC PS Unit Replacement Check

The system board incorporates the power supply. Power is supplied to the system board through the AC IN plug located on the AC PS unit. The AC PS unit may be damaged, refer to chapter 4 for instructions on how to disassemble the computer, and then perform the following checks:

Check 1 Replace the AC PS unit with a new one and restart the system. If the system is

still not functioning properly, perform Check 2.

Check 2 Replace the system board with a new one and restart the system. If the problem

still exists, other FRUs may be damaged.

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2.4 System Board and HDD I/F Board Troubleshooting

This section describes how to determine if the system board and sound board are 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

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 the Toshiba MS-DOS is properly loaded, go to Procedure 3.

Check 1 If one of the following error messages is displayed 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 system configuration in the RTC memory configuration is set to the default setting. If error message (b) appears often when the power is turned on, replace the RTC battery. If any other error message is displayed, perform Check 2.

(a) *** Bad HDD type ***