1 Hardware Overview 1.12 Power Supply
1-34 TECRA M3 Maintenance Manual (960-507)
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 green)
? Battery icon (sets LED to orange or green)
? 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 1-10.
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