Toshiba Satellite A40 Maintenance Manual - Page 49
Power Supply, Hardware Overview
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1.12 Power Supply 1 Hardware Overview 1.12 Power Supply The power supply supplies many different voltages to the system board and performs the following functions: 1. Checks power input to determine: • Whether the AC adaptor is connected to the computer. • Whether the battery pack is installed and supplying power. 2. Checks power supply's internal controls: • Battery pack charging: start, stop and voltage supplied to the battery pack. • Power supply system: Power supplied from a DC power source (AC adaptor). • Faulty power supply: Executes forced shutdown if needed. • Logic: Power supply to various circuits • Charging current to PWM control IC for battery pack charging 3. Controls the following aspects of the logic system • Power supply to gate arrays • Power on/off 4. Indicates the following: • DC IN (sets LED to orange or blue) • Battery icon (sets LED to orange or blue) • Faulty power supply by low battery 5. Interface for the following: • BIOS via EC/KBC • Function mode of power supply 6. Detects the following: • Input voltage to logic system • Input voltage, overvoltage and input/output to battery pack • Battery pack's internal temperature • Input voltage to DC power supply (output from AC adaptor) The power supply output rating is specified in Table 1-11. Satellite A40 Maintenance Manual (960-458) 1-33