Toshiba Satellite A660-BT3G25X Maintenance Manual - Page 31

1 Hardware Overview 1.5 Power Supply The power supply unit provides constant voltage (19V) for the system board and performs the following functions: 1. Power input monitor Checks whether the AC adapter (DC power supply) is connected to the computer. Checks whether the battery pack is connected to the computer. Monitors the DC power supply input voltage (AC Adapter output voltage). 2. Power supply's internal control Turns on and off the battery pack charging power supply. Issues a charging current instruction to the PWM control IC of the battery pack charging power supply. Controls the supply of DC power supply input (AC Adapter output) to the power supply unit. Controls the supply of power to the system block (load/logic circuit side). Controls forced shutdown if the power supply malfunctions. 3. Logic circuit control Instructs the gate array to enable/disable tuning the power on. Controls power-on/off operation. 4. Status display Turns on the Power LED (in White). Battery indicator (in White or Amber). DC-IN indicator (in White color) 5. External interface Performs communication through the I2C bus (via the internal EC/KBC). Transfers the power supply operation mode. Satellite A660/Pro A660 Maintenance Manual 1-14