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1 Hardware Overview
Satellite L500D Maintenance Manual
1-15
1.4
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 Green).
Battery indicator (in Green or Amber).
DC-IN indicator (in Green)
5. External interface
Performs communication through the I2C bus (via the internal EC/KBC).
Transfers the power supply operation mode.
Summary of Contents for Satellite L500D Series
Page 1: ... Toshiba Personal Computer Satellite L500D Maintenance Manual TOSHIBA CORPORATION ...
Page 13: ...Chapter 1 Hardware Overview ...
Page 16: ......
Page 35: ...Chapter 2 Troubleshooting Procedures 2 ...
Page 36: ......
Page 103: ...3 Tests and Diagnostics Satellite L500D Pro L500D Series Maintenance Manual 13 ...
Page 123: ...Chapter 4 Replacement Procedures ...
Page 233: ...Satellite L500 Pro L500 L500D Pro L500 Series Maintenance Manual E 6 11 Czech CZ Keyboard ...
Page 236: ...Satellite L500 Pro L500 L500D Pro L500 Series Maintenance Manual E 9 17 German GR Keyboard ...
Page 243: ...Satellite L500 Pro L500 L500D Pro L500 Series Maintenance Manual E 16 30 Japanese JP Keyboard ...