Power Supply - Toshiba 430CDT Maintenance Manual

1.9

Power Supply

The power supply provides five kinds of voltages to the 430 series system board. The power
supply has one microprocessor, operates at 500 KHz, and performs the following functions:
1. Determines if the AC cable or battery is connected to the computer.
2. Detects AC output and circuit malfunctions.
3. Controls the LED icon 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 1-8.
Use for
System logic, FDD, HDD,
Display
CPU
Flash ROM, PC card
CPU, RAM, GA
VRAM, GA
1-16
Table 1-8 Power supply output rating
Name voltage
VCC
CPUV
12V
B3V
B5V
DC Regulation
tolerance
(%)
+5 ±5
+2.9 ±5
+12 ±5
+3.3 ±0.3V
+4.7 ±5
430 Series