Toshiba Libretto 50CT/70CT Manual

							1.3  3.5-inch External FDD (Option)1  Hardware Overview1-8Libretto 50CT/70CT Maintenance Manual1.3 3.5-inch External FDD (Option)The 3.5-inch external FDD is a thin, high performance reliable drive that supports 720KB
(formatted) 2DD and 1.44MB (formatted) 2HD disks. The FDD can be connected to the PC
card slot.
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  FDD specifications
Item2MB mode1MB modeStorage capacity (KB)
Unformatted
Formatted2,000
1,4401,000
720Number of heads22Number of cylinders8080Access time (ms)
Track to track
Average
Head settling time3
181
153
181
15Recording track density (tpi)135135Data transfer rate (Kbps)500250Rotation speed (rpm)300300Recording methodModified Frequency Modulation (MFM) 
						

							1  Hardware Overview1.4  2.5-inch HDDLibretto 50CT/70CT Maintenance Manual1-91.4 2.5-inch HDDThe removable 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 Libretto 50CT computer supports a 815MB HDD.*
The Libretto 70CT computer supports a 1.58GB HDD.
The HDD is shown in Figure 1-5.Figure 1-5  2.5-inch HDD 
						

							1.4  2.5-inch HDD1  Hardware Overview1-10Libretto 50CT/70CT Maintenance ManualThe specifications for the HDDs are listed in Table 1-2.Table 1-2 HDD specifications
Libretto 50CT:  815MB HDD
ItemSpecificationsFormatted capacity (MB)815Number of disks1Logical heads2Bytes per sector512Rotation speed (rpm)4,000Recording method8-9 RLL*Libretto 70CT:  815MB HDD
ItemSpecificationsFormatted capacity (GB)1.58Number of disks1Logical heads2Bytes per sector512Rotation speed (rpm)4,000Recording method8-9 RLL 
						

							1  Hardware Overview1.5  KeyboardLibretto 50CT/70CT Maintenance Manual1-111.5 KeyboardThe 80- (USA) or 82- key (European) keyboard is mounted on the system unit.  The
keyboard is connected to the keyboard controller on the system board through one 20-pin flat
cable. The AccuPoint, located on the right of the display panel, provides convenient control
of the cursor without requiring desk space for a mouse.  The keyboard is shown in Figure
1-6.
See Appendix D for optional keyboard configurations.Figure 1-6  Keyboard
The specifications for the keyboard are listed in Table 1-3.Table 1-3 Keyboard specifications
ItemSpecificationsInput methodPantograph (Function keys use cylinders)Pitch15mmThickness6mm 
						

							1.6  LCD Panel1  Hardware Overview1-12Libretto 50CT/70CT Maintenance Manual1.6 LCD Panel
The display panel contains a TFT color LCD module, a fluorescent lamp (FL), and an FL
inverter board.
1.6.1 LCD Module
The TFT color LCD enables display of up to 16M colors at a resolution of 640 x 480 pixels.
The LCD module is shown in Figure 1-7.
Figure 1-7  LCD moduleThe specifications for the LCD are listed in Table 1-4.
Table 1-4  LCD specifications
ItemSpecificationsNumber of Pixels (pixels)640x480Dot pitch (mm)0.192x0.192Display area (mm)122.8(H)x92.16(V)Contrast100:1FL current (mA)4.6/4.0/2.8/2.4*
(Bright/Semi-bright)*NOTE: The FL currents at power on are:
BrightSemi-bright
Universal AC Adapter connected4.6 mA ¾ 2.8 mA
Universal AC Adapter not connected4.0 mA ¾ 2.4 mA 
						

							1  Hardware Overview1.6  LCD PanelLibretto 50CT/70CT Maintenance Manual1-131.6.2 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  FL inverter board specifications
ItemSpecificationsInputVoltage(V)5Power(W)2.2OutputVoltage(Vrms)800Current(mA)(4.6/4.0/2.8/2.4)*(Bright/Semi-bright)*NOTE: The FL currents at power on are:
BrightSemi-bright
Universal AC Adapter connected4.6 mA ¾ 2.8 mA
Universal AC Adapter not connected4.0 mA ¾ 2.4 mA 
						

							1.7  Power Supply1  Hardware Overview1-14Libretto 50CT/70CT Maintenance Manual1.7 Power Supply
The power supply provides two kinds of voltages to the system board, has one
microprocessor operating at 2 MHz, and performs the following functions:
1. Determines if the Universal AC Adapter or Main Battery Pack is connected to the
computer.
2. Detects DC output and circuit malfunctions.
3. Controls the LED icon and the speaker.
4. Detects a fully charged Main Battery Pack.
5. Controls power on/off.
6. Provides more accurate detection of a low Main Battery Pack.
7. Calculates the remaining Main Battery Pack capacity.
The power supply output rating is specified in Table 1-6.
Table 1-6  Power supply board output rating
DCRegulationUseNamevoltage (V)tolerance (%)CPU, RAM, GA,
VGA, VRAMB3V+3.3±5GA, BIOS ROM,
KBC, PC cardVCC+12.0±5 
						

							1  Hardware Overview1.8  BatteriesLibretto 50CT/70CT Maintenance Manual1-151.8 Batteries
The computer has two types of batteries:
q Main battery pack
q RTC battery
Battery specifications are listed in Table 1-7.
Table 1-7  Battery specifications
Battery nameMaterialOutput voltageCapacityMain battery packLithium-Ion10.8 V1,200 mAhRTC batteryNickel Metal Hydride2.4 V11 mAh1.8.1 Main Battery Pack
The removable main battery pack is the computer’s main power source when the Universal
AC Adapter is not connected.  The main battery pack maintains the state of the computer
when the computer enters into hibernation mode.
1.8.2 Battery Icon
The icon color shows the status of the removable battery pack. Each color indicates:
OrangeThe battery is being charged. (Universal AC Adapter connected)
GreenThe battery is full charged. (Universal AC Adapter connected)
Blinking orangeThe battery is low when the power is on.
No lightUnder any other conditions, the LED does not light.
1.8.3 Battery Charging Control
A power supply microprocessor mounted on the system board controls whether the battery
charge is on or off and also detects a full charge when the Universal AC Adapter and battery
are connected to the computer.  The system charges the battery using quick charge or trickle
charge.
q Quick Battery Charge
The battery quick charges when the Universal AC Adapter is connected and the
system is powered off or in stand-by mode. 
						

							1.8  Batteries1  Hardware Overview1-16Libretto 50CT/70CT Maintenance ManualTable 1-8  Time required for quick charge
ItemCharging timePower off or standbyAbout 4.5 hoursIf one of the following occurs, the Main Battery Pack quick charge process stops.
1. The Main Battery Pack becomes fully charged.
2. The Universal AC Adapter or Main Battery Pack is removed.
3. The Main Battery Pack or output voltage is abnormal.
q Trickle Battery Charge
The Main Battery Pack will trickle charge when the Universal AC Adapter is
connected and the system is on or when the main battery pack becomes fully charged.
The microprocessor automatically changes quick charge to trickle charge.
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
ItemTimeCharging Time48 hoursData preservation period (full charge)About 1 month 
						

							Chapter 2Troubleshooting Procedures