Toshiba T1900 Series - Power Supply and Battery Management; Power Supply Overview

1.8 Power Supply
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The T1900ff1900C power supply board has one microprocessor and operates at 500 KHz.
The board performs 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 ofa low battery.
7. Calculates the remaining battery capacity.
The power supply board output rating
is specified in Table 1-7.
Table 1-7 Power Supply Board Output Rating
DC
R~ulatlon
Maximum
Use for
Name
Voltage Toeranee Current
RiP~e
(V)
(%)
(mA)
(m
System logic, FDD, HOD,
VCC
+5
±5
3,500
100
Display
RS-232-C, Flash
ROM 12V
+12
±5 120 240
RAM,
CPU
B3V
+3.3
±5
755 66
RS-232-C
M12V -7 to -12.6
-
10
-
1-14