1 Hardware Overview 1.8 Power Supply
1-24 PORTEGE M300 Maintenance Manual (960-504)
1.8 Power Supply The power supply supplies many different voltages to the system board and performs the
following functions:
1. Judges that 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.
The power supply output rating is specified in Table 1-10.