Toshiba T3400CT User Manual

T3400/T3400CT Maintenance Manual
1-1
1.1 Features
The Toshiba T3400/T3400CT is one of the lightest and most advanced portable computers
available. Utilizing advanced technology and high-speed components, the T3400/T3400CT
offers excellent display legibility, battery operation and IBM PC/AT compatibility. The
T3400/T3400CT system unit consists of the following features:
❑ Microprocessor
The T3400/T3400CT uses an SL Enhanced Intel 486SX-33 microprocessor that
operates at 33 MHz, 3.3 Volts.
❑ Cache memory
The T3400/T3400CT has an 8 Kilobyte (KB) cache memory stored in the i486SX
microprocessor.
❑ Disk storage
The T3400/T3400CT has an internal 120 Megabyte (MB) Hard Disk Drive (HDD)
with an average access time of 17 milliseconds. An external 3.5-inch Floppy Disk
Drive (FDD) supports 2HD floppy disks (1.44 MB) and 2DD floppy disks (720 KB).
❑ Memory
The T3400/T3400CT comes standard with 4 MB of CMOS Random-Access Memory
(RAM) 3.3 Volts. This includes 640 KB of conventional memory and 3,456 KB of
extended memory which can be utilized as expanded memory compatible with Lotus/
Intel/Microsoft-Expanded Memory Specifications (LIM-EMS).
❑ Monochrome LCD (T3400)
A high-resolution, Liquid Crystal Display (LCD) displays 640 x 480 pixels with a
64-level gray scale.
The T3400 internal display controller supports Video Graphics Array (VGA) func-
tions on the internal display and Super VGA (SVGA) functions on the external
display.
❑ TFT color LCD (T3400CT)
A high-resolution, Thin-Film Transistor (TFT) full-color LCD displays 640 x 480
pixels. The T3400CT internal display controller supports VGA functions for internal
display and Super VGA (SVGA) functions for external display.
❑ Keyboard
An easy-to-use 82/84-key keyboard includes a keypad overlay for fast numeric data
entry or cursor and page control. The computer keyboard supports software that uses
a 101- or 102-key enhanced keyboard.

Toshiba T3400CT Specifications

General

Processor Speed	25 MHz
RAM	4 MB
RAM Expandable To	20 MB
Storage	120 MB HDD
Display Resolution	640 x 480
Graphics	Integrated
Processor	Intel 80486
Operating System	MS-DOS
Ports	Serial, Parallel, VGA

Summary

Toshiba T3400/T3400CT Features

Core System Components

Details microprocessor, memory, disk storage, and cache specifications.

Display Options

Describes Monochrome LCD and TFT Color LCD capabilities.

Keyboard and Peripherals

Covers keyboard, batteries, expansion slots, and connectivity ports.

System Unit Block Diagram

CPU and Memory Components

Details the CPU, RAM, ROM, and Video RAM specifications.

System Controller and Interface Chips

Describes Gate Arrays, RTC, KBC, and Display Controller chips.

External 3.5-inch Floppy Disk Drive

2.5-inch Hard Disk Drive

Keyboard Overview

LCD Display Information

Monochrome LCD Module Details

Details the 640x480 LCD with 64 grayscale levels and VGA/SVGA support.

Monochrome FL Inverter Board

Describes the inverter board supplying current to the FL.

TFT Color LCD Information

TFT Color LCD Module Details

Details the 640x480 TFT color LCD with 256K colors and VGA/SVGA.

TFT Color FL Inverter Board

Details the inverter board for the TFT color LCD backlight.

Power Supply System

Battery System

Main Battery Details

Explains the main battery pack, its role, and the battery indicator.

Battery Charging and Backup Functions

Details battery charging control and backup battery role.

RTC Battery Function

Describes the RTC battery's function and charging/preservation times.

Troubleshooting Overview

Troubleshooting Flowchart

Power Supply Troubleshooting Procedures

DC IN Icon Indicator Check

Guides checks for the DC IN icon and related indicators.

Battery LED Indicator Check

Guides checks for the battery LED status and charging.

Connection and Replacement Checks

Checks board connections and component replacement.

System Board Troubleshooting Procedures

Message Check Procedures

Checks system messages for errors like CMOS, battery, checksum, memory, time.

Printer Port LED Diagnostics

Uses printer port LEDs to diagnose boot and resume mode status.

Diagnostic Test Execution

Executes system, memory, printer, ASYNC, real timer, PCMCIA tests.

System Board Replacement

System board replacement if diagnostics fail.

Floppy Disk Drive Troubleshooting

FDD Head Cleaning Check

Procedure for cleaning FDD heads.

FDD Connector and Cable Checks

Checks FDD cable connection and component replacement.

Hard Disk Drive Troubleshooting

HDD Partition and Message Checks

Checks HDD partition status and error messages.

HDD Format Checks

Performs HDD formatting checks.

HDD Diagnostic Test Execution

Executes HDD diagnostic tests and interprets error codes.

Keyboard Troubleshooting

Keyboard Diagnostic Tests

Executes keyboard diagnostic tests.

Keyboard Connector and Replacement

Checks keyboard cable and controller.

Display Troubleshooting

External Monitor and Display Tests

Checks external monitor and runs display diagnostic tests.

Display Connector and Replacement

Checks display unit connections and component replacement.

The Diagnostic Test Program

Diagnostics Menu Overview

Lists the main functions available in the diagnostic program.

Executing the Diagnostic Test

Instructions for running diagnostic tests via disk or CONFIG.SYS.

Diagnostic Test Subtest Names

System Test Subtests

Lists subtests for the System Test.

Memory Test Subtests

Lists subtests for the Memory Test.

Keyboard Test Subtests

Lists subtests for the Keyboard Test.

Display Test Subtests

Lists subtests for the Display Test.

System Test Procedures

ROM Checksum Test

Tests the system board ROM checksum.

Hardware Status Test

Displays hardware status bits for CPU clock, FDD type, etc.

Version Check Test

Checks BIOS ROM, Boot ROM, KBC, and PS microprocessor versions.

Memory Test Procedures

RAM Constant Data Test

Tests RAM by writing constant data and comparing it.

Optional Memory Module Test

Tests optional memory cards.

Keyboard Test Procedures

Pressed Key Display Test

Displays keyboard layout and shows pressed keys.

PS/2 Mouse Connection Test

Checks if a PS/2 mouse is connected.

Display Test Procedures

VRAM Read/Write Test

Tests VRAM by writing and reading data.

Character Attributes Test

Displays characters in different attribute modes and colors.

64 Color Display Test

Displays colors and shades in 640x480 mode.

Floppy Disk Test Procedures

Test Drive Number Selection

Selects the FDD drive to be tested.

Floppy Disk Test Menu

Displays the menu for selecting floppy disk subtests.

Sequential Read Test

Performs CRC check by reading all tracks on a floppy disk.

Printer Test Procedures

Printer Channel Selection

Selects the printer channel number for testing.

Ripple Pattern Print Test

Prints characters line-by-line to test printer output.

Printer Function Test

Tests various printer functions like normal, double-width, compressed print.

Async Test Procedures

Async Data Format Parameters

Specifies data format for async tests: Method, Speed, Data, Pattern.

Serial Port Channel Selection

Selects serial port channel for async tests.

Wraparound Board Test

Checks serial data send/receive via wraparound connector.

Hard Disk Test Procedures

Test Drive Number Selection

Selects the HDD drive number to be tested.

HDD Format Checks

Performs low-level and MS-DOS formatting checks.

Hard Disk Test Detail Status

Provides detailed status information for hard disk test errors.

Real Timer Test Procedures

Real Time Input and Verification

Allows input and verification of current date and time.

Backup Memory Test

Tests backup memory by writing/reading data patterns.

Real Time Clock Increment Check

Checks real time clock increments and date/time display.

PCMCIA Test Procedures

PCMCIA Slot Signal Line Test

Checks signal lines of the PCMCIA slot.

Error Code and Status Names

Head Cleaning Procedures

FDD Head Cleaning Function

Cleans FDD heads using load/seek and read operations.

FDD Head Cleaning Operations

Steps to perform FDD head cleaning.

Log Utilities Procedures

Error Logging Function Description

Logs error information during tests and stores it.

Logging Error Information Operations

Steps to log error information into RAM or floppy disk.

Running Test Procedures

Sequential Diagnostic Test Execution

Executes a sequence of diagnostic tests.

Running Test Operations

Steps to run the diagnostic test sequence.

Floppy Disk Drive Utilities

FDD Utilities Function Description

Formats, copies, and displays dump lists for FDD and HDD.

FDD Utilities Operations

Steps for using FDD Utilities.

System Configuration Information

System Configuration Operations

Steps to display system configuration details.

System Setup Utility

Setup Function Description

Lists current system setup information categories.

Memory Setup Options

Details setup options for computer memory.

Display Setup Options

Details setup options related to the display.

COM/PCMCIA/FDD/PRT Setup

Setup for Serial Port, PC Card Slot, Ext. FDD/PRT, Printer Port Type.

Accessing and Using the SETUP Utility

Navigating and Changing SETUP Values

Describes navigation and value modification within the SETUP menu.

Saving and Exiting SETUP

Procedures for saving changes and exiting SETUP.

General Computer Disassembly

Before Beginning Disassembly

General precautions before disassembling the computer.

Disassembly Procedures Overview

Explains types of cable connectors and disconnection/attachment methods.

Assembly Procedures Guidelines

Reminders for re-assembling the computer correctly.

Required Tools and Equipment

Lists necessary tools and ESD equipment for disassembly/assembly.

Battery Pack Removal and Installation

Battery Pack Removal Steps

Steps to remove the battery pack.

Battery Pack Installation Steps

Steps to install the battery pack.

Optional Memory Card Procedures

Memory Card Removal Steps

Steps to remove the optional memory card.

Memory Card Installation Steps

Steps to install the optional memory card.

Optional PCMCIA Card Procedures

PCMCIA Card Removal Steps

Steps to remove the optional PCMCIA card.

PCMCIA Card Installation Steps

Steps to install the optional PCMCIA card.

Top Cover Removal and Installation

Top Cover Removal Steps

Steps to remove the top cover.

Top Cover Installation Steps

Steps to install the top cover.

Hard Disk Drive Procedures

HDD Removal Steps

Steps to remove the HDD.

HDD Installation Steps

Steps to install the HDD.

RTC and Backup Batteries Procedures

RTC and Backup Batteries Removal Steps

Steps to remove the RTC and backup batteries.

RTC and Backup Batteries Installation Steps

Steps to install the RTC and backup batteries.

AccuPoint Control Button Procedures

AccuPoint Control Button Removal Steps

Steps to remove the AccuPoint control button.

AccuPoint Control Button Installation Steps

Steps to install the AccuPoint control button.

System Board Procedures

System Board Removal Steps

Steps to remove the system board.

System Board Installation Steps

Steps to install the system board.

Power Supply Board Procedures

Power Supply Board Removal Steps

Steps to remove the power supply board.

Power Supply Board Installation Steps

Steps to install the power supply board.

Keyboard Removal and Installation

Keyboard Removal Steps

Steps to remove the keyboard.

Keyboard Installation Steps

Steps to install the keyboard.

LED Board Procedures

LED Board Removal Steps

Steps to remove the LED board.

LED Board Installation Steps

Steps to install the LED board.

Display Mask Procedures

Display Mask Removal Steps

Steps to remove the display mask.

Display Mask Installation Steps

Steps to install the display mask.

FL Inverter Board Procedures

FL Inverter Board Removal Steps

Steps to remove the FL inverter board.

FL Inverter Board Installation Steps

Steps to install the FL inverter board.

Monochrome Display Module Procedures

Monochrome Display Module Removal Steps

Steps to remove the monochrome display module.

Monochrome Display Module Installation Steps

Steps to install the monochrome display module.

Monochrome Fluorescent Lamp Procedures

Monochrome Fluorescent Lamp Removal Steps

Steps to remove the monochrome fluorescent lamp.

Monochrome Fluorescent Lamp Installation Steps

Steps to install the monochrome fluorescent lamp.

TFT Color Display Module Procedures

TFT Color Display Module Removal Steps

Steps to remove the TFT color display module.

TFT Color Display Module Installation Steps

Steps to install the TFT color display module.

TFT Color Fluorescent Lamp Unit Procedures

TFT Color Fluorescent Lamp Unit Removal Steps

Steps to remove the TFT color fluorescent lamp unit.

TFT Color Fluorescent Lamp Unit Installation Steps

Steps to install the TFT color fluorescent lamp unit.

Appendix A: LCD Module Handling Precautions

General LCD Module Handling Precautions

General precautions for handling the LCD module during assembly/disassembly.

LCD Panel Cleaning Procedures

Instructions for cleaning a dirty LCD panel surface.

Electrostatic Discharge Protection

Precautions against electrostatic discharge damage.

Appendix B: System Board Layout Diagrams

System Board Front View Layout

Diagram showing the front view of the system board layout.

System Board Back View Layout

Diagram showing the back view of the system board layout.

System Board Components Listing

Lists ICs and connectors on the system board (Front and Back).

Appendix C: Connector Pin Assignments

PJ1 Memory Slot Connector Pins

Pin assignment details for the PJ1 memory slot connector.

PJ3 PRT/FDD Connector Pins (Printer)

Pin assignment details for the PJ3 PRT/FDD connector (Printer).

PJ5 Internal HDD Connector Pins

Pin assignment details for the PJ5 internal HDD connector.

PJ9 PC Card Slot Connector Pins

Pin assignment details for the PJ9 PC Card slot connector.

Appendix E: Keyboard Scan Code Tables

Scan Codes Set 1 and Set 2 Table (Part 1)

Lists keyboard scan codes for Set 1 and Set 2.

Scan Codes with Left Shift Key Table

Shows scan codes when Left Shift key is used.

Scan Codes with Fn Key Table

Lists scan codes when Fn key is used.

Scan Codes with Ctrl Key Table

Lists scan codes when Ctrl key is used.

Appendix F: Keyboard Layout Diagrams

United States (US) Keyboard Layout

Diagram of the US keyboard layout.

German (GR) Keyboard Layout

Diagram of the German keyboard layout.

Spanish (SP) Keyboard Layout

Diagram of the Spanish keyboard layout.

Canadian (Specialized) Keyboard Layout

Diagram of the Canadian keyboard layout.

Appendix G: Wiring Diagrams

Printer Wraparound Connector Diagram

Wiring diagram for the printer wraparound connector.

RS-232C Wraparound Connector Diagram

Wiring diagram for the RS-232C wraparound connector.

RS-232C Direct Cable (9-Pin to 9-Pin) Diagram

Wiring diagram for the RS-232C direct cable (9-pin to 9-pin).

Appendix H: BIOS Rewrite Procedures

BIOS Rewrite Tools

Lists the required tool for BIOS rewriting.

BIOS Rewriting Steps

Step-by-step guide for rewriting the system BIOS.