1 Hardware Overview
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NB300 Maintenance Manual
1-10
1.3
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.
Содержание mini NB300
Страница 1: ...Toshiba Personal Computer NB300 Maintenance Manual TOSHIBA CORPORATION CONFIDENTIAL ...
Страница 13: ...Chapter 1 Hardware Overview ...
Страница 16: ......
Страница 30: ...Chapter 2 Troubleshooting Procedures ...
Страница 31: ......
Страница 77: ...Chapter 3 Tests and Diagnostic ...
Страница 88: ...3 Tests and Diagnostics If FAN RPM check is NG it will show as below NB300 305 Series Maintenance Manual 12 ...
Страница 99: ...3 Tests and Diagnostics NB300 305 Series Maintenance Manual 23 ...
Страница 103: ...3 Tests and Diagnostics The screen will show below picture if RTC test is FAIL NB300 305 Series Maintenance Manual 27 ...
Страница 109: ...3 Tests and Diagnostics NB300 305 Series Maintenance Manual 33 ...
Страница 120: ...3 Tests and Diagnostics If W R T P type passes the screen would display as below NB300 305 Series Maintenance Manual 44 ...
Страница 121: ...3 Tests and Diagnostics NB300 305 Series Maintenance Manual 45 ...
Страница 131: ...3 Tests and Diagnostics NB300 305 Series Maintenance Manual 55 ...
Страница 133: ...3 Tests and Diagnostics If press 6 program will go back to test title as below NB300 305 Series Maintenance Manual 57 ...
Страница 134: ...Chapter 4 Replacement Procedures ...
Страница 231: ...Figure UI keyboard 7 Hebrew HB Keyboard Figure HB keyboard E 4 CONFIDENTIAL NB300 Series Maintenance Manual ...
Страница 236: ...16 French FR Keyboard Figure FR keyboard 17 German GR Keyboard NB300 Series Maintenance Manual CONFIDENTIAL E 9 ...
Страница 240: ...Figure SD keyboard 24 Belgian BE Keyboard Figure BE keyboard NB300 Series Maintenance Manual CONFIDENTIAL E 13 ...
Страница 244: ...31 Bulgaria BU Keyboard Figure BU keyboard 32 Japanese JP Keyboard NB300 Series Maintenance Manual CONFIDENTIAL E 17 ...
Страница 245: ...E 18 CONFIDENTIAL NB300 Series Maintenance Manual Figure JP keyboard ...