Toshiba Tecra A3/S2 1.5 Power Supply

1.5 Power Supply 1 Hardware Overview
Tecra A3/S2 Series Maintenance Manual 1-19
1.5 Power Supply
The power supply supplies seven different voltages to the system board and performs the
following functions:
1. A/D conversion
The EC uses 8-bit sampling for A/D conversion to determine the following values:
• AC adaptor current
• Battery and temperature
2. AC adaptor and battery check
The EC checks the following by A/D converted values:
• Battery installed
The EC checks the following by GPIO values:
• AC adaptor connected
3. Abnormal check
The EC determines whether the condition is abnormal, and if so, stores an error code into
the error register.
4. Input port management
The EC monitors the following input signal status:
• System power ON/OFF status
5. Beep and LED control
Beep is caused by the low battery status.
The EC controls the following two kinds of LED
DC IN LED (one color: Blue or Green(by sku))
• Green = indicates AC adaptor is connected
Battery LED (two colors: Green & Orange Æ Blue & Orange)
• Blue or Green solid = The battery is fully charged.
• Orange = The computer is quick-charging the battery / The battery is low.