Toshiba T3400 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 T3400 Specifications

General

Model	T3400
Category	Laptop
Storage	40 MB HDD
Resolution	640x480
Display	Monochrome
Operating System	MS-DOS
Display Type	LCD
Screen Size	10.4 inches

Summary

Toshiba T3400/T3400CT Features

Microprocessor and Memory Specifications

Details the 80486SX-33 microprocessor, 8KB cache, 4MB RAM, and other memory configurations.

Display Options: Monochrome and TFT Color LCD

System Unit Block Diagram and Components

Major System Board Components

External Drives and Peripherals

External 3.5-inch Floppy Disk Drive

Describes the 3.5-inch FDD and its specifications for 720KB and 1.44MB disks.

2.5-inch Hard Disk Drive Specifications

Details the 120 MB HDD specifications including capacity, access time, and transfer rate.

Power Supply and Battery System

Power Supply Functions and Ratings

Explains the power supply's functions and lists its output voltage and current ratings.

Battery Types and Specifications

Details the Main, Backup, and RTC batteries, their materials, voltage, and capacity.

Troubleshooting Procedures

Troubleshooting Flowchart and Initial Checks

Provides a flowchart and initial verification steps for system troubleshooting.

Power Supply Troubleshooting Steps

Guides through troubleshooting the power supply via DC IN icon and battery LED checks.

System Board Troubleshooting Procedures

Details procedures for checking messages, printer port LEDs, and executing diagnostic tests.

Floppy Disk Drive Troubleshooting

Provides steps to troubleshoot the external 3.5-inch floppy disk drive, including head cleaning.

Hard Disk Drive Troubleshooting Steps

Guides through HDD troubleshooting: partition, message, format, and diagnostic checks.

Keyboard Troubleshooting Procedures

Details procedures for troubleshooting keyboard issues via diagnostic tests and connector checks.

Display Troubleshooting Procedures

Guides on troubleshooting display issues, including external monitor and diagnostic tests.

Diagnostic Test Program Usage

Executing the Diagnostic Test Program

System, Memory, and Keyboard Tests

Display, Floppy Disk, and Printer Tests

Async, Hard Disk, and Real Timer Tests

PCMCIA Test and Error Code Reference

Hard Disk Test Detail Status and Formatting

FDD Utilities and Running Test Function

System Configuration and Setup Options