Battery charging is controlled by a power supply microprocessor. The power supply
microprocessor controls power supply and detects a full charge when the AC adaptor and
battery are connected to the computer.

Battery Charge
When the AC adapter is connected, normal charging is used while the system is
turned on and quick charge is used while the system is turned off.

Condition                                 Charging Time
Power On Charge                 About 6 hours
Power Off Charge                About 3 hours

Charge is stopped in the following cases.
1. The main battery is fully charged
2. The main battery is removed
3. Main battery or AC adapter voltage is abnormal
4. Charging current is abnormal

Data preservation time
When turning off the power in being charged fully

Condition                       Preservation time
Standby                         About 3 days
Hibernation                    About 1 month


RTC Battery
The RTC battery provides the power supply to maintain the date, time, and other system
information in memory.
Table 1-13 lists the Time required for charges of RTC battery and data preservation time.

Condition                                                             Time
Power ON (Lights Power LED)                       About 24 hours
Data preservation tome (Full-charged)              About a month

This chapter describes the fault diagnosis procedures for field replaceable units (FRUs) in the
computer.

The FRUs covered here are as follows:
1. System board
2. 2.5-inch HDD
3. Keyboard
4. Display
5. ODD drive
6. LAN
7. Speaker
8. IEEE 1394
9. Cooling module

See Chapter 4 for the procedures to replace FRUs and Chapter 3 for the procedures to use test
programs
The following tools are required to perform the diagnostic procedures:
1. Diagnostics (maintenance test program) disk
2. Phillips screwdrivers (2 mm, 2.5 mm)
3. Cleaning disk kit (for ODD drive cleaning)
4. Bootable CD
5. PC Card loopback connector
6. Multimeter
7. External monitor
8. Headphone
9. Microphone
10. A-BEX TEST DVD
11. Music CD
12. DVD TSD-1 (TOSHIBA EMI DVD Test Media)

Keyboard

A keyboard which consists of 84(US)/85(Euro) keys is mounted on the system unit. The
keyboard is connected to membrane connector on the system board and controlled by the
keyboard controller.

The power supply supplies 23 different voltages to the system board.
The power supply microcontroller has the following functions.
1. Judges if the DC power supply (AC adapter) is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the battery icon, and DC IN icon.
4. Turns the battery charging system on and off and detects a fully charged battery.
5. Turns the power supply on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
8. Controls the transmission of the status signal of the main battery.

It supports Celeron-M CPU as follows
Intel Celeron -M 350 (1.30GHz)
360 (1.40GHz)
370 (1.50GHz)
380 (1.6GHz)
L1 cache : 64KB (32KB + 32KB)
L2 cache : 1MB
FSB : 400MHz Core voltage : 1.26V

Microprocessor
Microprocessor that is used will be different of the model.
it supports Celeron-M as follows
Intel ® Celeron ®-M 350 (1.30GHz)
360 (1.40GHz)
370 (1.50GHz)
380 (1.60GHz)
L1 cache : 64KB (32KB + 32KB)
L2 cache : 1MB
Front side Bus : 400MHz