1 Hardware Overview
Satellite/Satellite Pro U500D/505D/507D/PORTEGE M900 Maintenance Manual [CONFIDENTIAL] 1-21
1.7 Power Supply
The power supply provides different voltages to the system board and performs the following
functions:
1. Determines 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.
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