1.9 Power Supply
The power supply uses a microprocessor to monitor and regulate the voltages used within the
T1950 Series computers. The power supply contains the following functions:
1. Determines if the AC adapter or battery is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the LED indicator and speaker.
4. Turns the battery charging system on and off and detects a fully charged
battery.
5. Determines if the power can be turned on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
The power supply output rating is specified in Table 1-9.
Table 1-9 Power Supply Output Rating
DC Regulation Maximum
Use for Name voltage tolerance current Ripple
(V) (%) (mA) (mV)
System logic, FDD, HDD, VCC +5 ±5 3,500 100
Display
RS-232C, Flash ROM 12V +12 ±5 120 240
RAM, CPU B3V +3.3 ±5 755 66
RS-232C M12V –7 to –12.6 – 10 –
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