Power Supply - Toshiba TECRA M3 Maintenance Manual

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 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.
1-34
1.12 Power Supply
TECRA M3 Maintenance Manual (960-507)