Toshiba Libretto 50CT/70CT Manual

							1-iiLibretto 50CT/70CT Maintenance Manual 
						

							Libretto 50CT/70CT Maintenance Manual1-iiiTable of Contents1.1  Features.......................................................................................................................1-1
1.2  System Unit Block Diagram.........................................................................................1-4
1.3  3.5-inch External FDD (Option)..................................................................................1-7
1.4  2.5-inch HDD..............................................................................................................1-8
1.5  Keyboard.....................................................................................................................1-9
1.6  LCD Panel.................................................................................................................1-10
1.6.1  LCD Module.........................................................................................1-10
1.6.2  FL Inverter Board.................................................................................1-11
1.7  Power Supply............................................................................................................1-12
1.8  Batteries....................................................................................................................1-13
1.8.1  Main Battery Pack.................................................................................1-13
1.8.2  Battery Icon..........................................................................................1-13
1.8.3  Battery Charging Control......................................................................1-13
1.8.4  RTC battery..........................................................................................1-14
Figures
Figure 1-1  Front of the computer.......................................................................................1-3
Figure 1-2  System unit configuration.................................................................................1-3
Figure 1-3  System unit block diagram................................................................................1-4
Figure 1-4  3.5-inch FDD...................................................................................................1-7
Figure 1-5  2.5-inch HDD...................................................................................................1-8
Figure 1-6  Keyboard..........................................................................................................1-9
Figure 1-7  LCD module...................................................................................................1-10
Tables
Table 1-1  FDD specifications.............................................................................................1-7
Table 1-2  HDD specifications............................................................................................1-8
Table 1-3  Keyboard specifications.....................................................................................1-9
Table 1-4  LCD specifications...........................................................................................1-10 
						

							1-ivLibretto 50CT/70CT Maintenance ManualTable 1-5  FL inverter board specifications.......................................................................1-11
Table 1-6  Power supply board output rating....................................................................1-12
Table 1-7  Battery specifications.......................................................................................1-13
Table 1-8  Time required for quick charge........................................................................1-14
Table 1-9  RTC battery charging/data preservation time....................................................1-14 
						

							1  Hardware Overview1.1  FeaturesLibretto 50CT/70CT Maintenance Manual1-11 
1.1 Features
The Libretto 50CT/70CT uses Toshiba’s advanced Large Scale Integration (LSI) and
Complementary Metal-Oxide Semiconductor (CMOS) technology extensively to provide
compact size, minimum weight, low power usage, and high reliability. The following features
and benefits are incorporated:qMicroprocessor
The Libretto 50CT has a 64-bit microprocessor, Intel Pentium processor running at a
clock speed of 75MHz.
*The Libretto 70CT has a 64-bit microprocessor, Intel Pentium processor with MMX
technology running at a clock speed of 120MHz.
q Memory
Standard 16MB of Extend Data Out (EDO) DRAM.
q Hard Disk Drive (HDD)
The Libretto 50CT has a 2.5-inch HDD with a capacity of 815MB.
*The Libretto 70CT has a 2.5-inch HDD with a capacity of 1.58GB.
q Display
A 6.1-inch, Thin Film Transistor (TFT) color Liquid Crystal Display (LCD), that
enables a display of up to 16M colors at a resolution of 640 x 480 pixels.
A video controller and 1MB of VRAM enable an external monitor to display 16M
colors at a resolution of 1280 x 1024 pixels.
q Keyboard
An easy-to-use 80/82-key keyboard provides: a numeric keypad overlay for fast
numeric data entry and cursor/page control; two keys that have special functions in
Microsoft Windows 95; and software that supports a 101- or 102-key enhanced
keyboard.
q Batteries
Two batteries: a Lithium-Ion main battery pack and RTC battery that backs up the
Real Time Clock and CMOS memory.
q Expansion
An optional 8 or 16MB memory kit can be installed in the memory slot. 
						

							1.1  Features1  Hardware Overview1-2Libretto 50CT/70CT Maintenance Manualq Parallel port
A Centronics compatible parallel port on the I/O adapter enables connection of a
printer or other parallel device and supports the Extended Capabilities Port (ECP)
conforming to IEEE-1284.
q Serial port
A standard, 9-pin, serial port only on the I/O adapter enables connection of such serial
devices as a serial printer, mouse, or modem. A Universal Asynchronous
Receiver/Transmitter (UART) is 16550A equivalent.
q External monitor port
The port is available only on the I/O adapter and enables connection of an external
SVGA compatible monitor.
q PC card slot
A PC card slot accommodates one 5mm card (Type II). The slot supports PCMCIA
Release 2.01 cards and an optional external FDD.
q Docking interface port
A 132-pin, docking interface port enables connection of the I/O port adapter or an
optional Enhanced Port Replicator.
The Enhanced Port Replicator has one additional PC card slot that accommodates a
10.5mm card (Type III) and duplicates the ports available on the I/O adapter, in
addition to the connection of the PS/2 compatible mouse and keyboard.
q AccuPoint
The pointer control stick, located on the right of the display panel, provides
convenient control of the cursor without requiring desk space for a mouse.
q Infrared port
An Infrared Data Association (IrDA) 1.0 standard infrared port, which enables
cableless 115.2Kbps data transfer.
q Sound system
A Sound Blaster Pro compatible, 16-bit sound system enables the computer to play
back sound. The sound system is equipped with a built-in speaker and stereo
headphone jack.
q External Floppy Disk Drive (FDD)(Option)
A 3.5-inch external FDD is connected to the PC card slot and accommodates both
2HD (1.44MB) and 2DD (720KB) disks. 
						

							1  Hardware Overview1.1  FeaturesLibretto 50CT/70CT Maintenance Manual1-3The front of the computer is shown in Figure 1-1.Figure 1-1  Front of the computer
The system unit configuration is shown in Figure 1-2.Figure 1-2  System unit configuration 
						

							1.2  System Unit Block Diagram1  Hardware Overview1-4Libretto 50CT/70CT Maintenance Manual1.2 System Unit Block Diagram
Figure 1-3 is a block diagram of the system unit.Figure 1-3  System unit block diagram 
						

							1  Hardware Overview1.2  System Unit Block DiagramLibretto 50CT/70CT Maintenance Manual1-5The system unit is composed of the following major components:q Microprocessor
Libretto 50CT:  Intel 75 MHz Pentium processor operates at 2.9/3.3 volts and
incorporates the math co-processor and 16 KB cache memory.
*Libretto 70CT:  Intel 120 MHz Pentium processor with MMX technology operates
at 2.9/3.3 volts and incorporates the math co-processor and 16 KB cache memory.
q Standard RAM
· 16 MB, eight 1M x 16-bit EDO DRAM chips
· 3.3 volt operation
· No parity bit
· Access time 70 ns
· Data transfer is 64-bit width
q BIOS ROM (Flash EEPROM)
· 256 KB, one 256K x 8-bit chip
- 64 KB are used for system BIOS
- 40 KB are used for VGA BIOS
- 152 KB are reserved
· Access time 120 ns
· Data transfer is 8-bit width
q Expansion memory
One expansion memory slot is available for 8 and 16 MB memory kits, which consist
of 1M x 16-bit EDO DRAM chips.
· 3.3 volt operation
· No parity bit
· Access time 70 ns
· Data transfer is 64-bit width
q Video Controller
Chips & Technologies F65550 is used. The video controller integrates an LCD/CRT
graphics controller, RAMDAC, and clock synthesizers.
q Video RAM
· 1 MB, two 256K x 16-bit DRAM chips
· 3.3 volt operation
· Access time 50 ns 
						

							1.2  System Unit Block Diagram1  Hardware Overview1-6Libretto 50CT/70CT Maintenance Manualq System Controller Gate Array
This gate array has the following functions:
· Two PICs:82C59 equivalent
· Two UARTs:16550A equivalent (one SIO is used for SIR)
· One PIT:82C54 equivalent
· One RTC:T9934 equivalent
· Two DMACs:82C37 equivalent
· I/O port decode
· SIO port control
· Parallel (ECP) port control
· Speaker control
· Power supply microprocessor interface
· PnP support
· CPU control
- SMI control
- Clock speed control
· Memory control
- 64-bit memory bus control
· Video local bus control
- 64 to 32-bit, 32 to 64-bit data bus interface
· Address latch control
- Address conversion
- Address latch
· Hibernation control
· Ring wake up control
· PC card control
- Memory card control
- I/O card control
· BIOS-ROM interface
· Infrared port control
· Sound control
q Keyboard Controller (KBC)
This KBC includes: the keyboard scan controller and keyboard interface controller;
and controls: the internal keyboard, external keyboard, IPS and PS/2 mouse. 
						

							1  Hardware Overview1.2  System Unit Block DiagramLibretto 50CT/70CT Maintenance Manual1-7q Internal Pointing Stick Controller (IPSC)
Provides simultaneous control of both an AccuPoint and a PS/2 mouse.
q Sound Controller
The Libretto 50CT uses one OPL3-SA2 that incorporates: OPL3 FM synthesizer,
Digital Analog Converter (DAC), and MPU401 MIDI interface.
*The Libretto 70CT uses one OPL3-SA3 that incorporates: OPL3 FM synthesizer,
Digital Analog Converter (DAC), and MPU401 MIDI interface.