Toshiba A205-S4777 Maintenance Manual - Page 24

1 Hardware Overview 1.5 Power Supply 1.5 Power Supply This specification defines the performance and characteristics of the 65W, 75W, 90W, and 120W AC adapter power supply. It supplies a constant voltage 19V output source for the Minnesota 10M/10MG Series Personal Computer. ‰ A/D conversion • The EC uses 10-bit sampling for A/D conversion to determine the following values: - Battery and temperature ‰ AC adapter and battery check • The EC checks the following by A/D converted values: - Battery installed • The EC checks the following by GPIO values: - AC adapter connected ‰ Abnormal check • The EC determines whether the condition is abnormal, and if so, stores an error code into the error register. ‰ Input port management • The EC monitors the following input signal status: - System power ON/OFF status - Direct CD power ON/OFF status ‰ 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) • Blue: indicates AC adapter is connected - Battery LED (two colors: orange and blue) • Blue solid: The battery is fully charged. • Orange: The computer is quick-charging the battery / the battery is low. ‰ Power ON/OFF sequence • When power is turned on or off, the EC starts the power on or off sequence. - SQ0-4: power ON sequence - SQ5-B: power OFF sequence 1-10 Minnesota 10M/10MG Series Maintenance Manual