Power Supply - Toshiba T3400 Maintenance Manual

1.8

Power Supply

The power supply provides five kinds of voltages to the system board. The power supply has
one microprocessor which operates at 500 Hz and 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 icon and speaker.
4. Turns the battery charging system on and off.
5. Determines if the power can be turned on and off.
6. Determines if the battery is fully charged or low.
7. Calculates remaining battery capacity.
Power supply output ratings are specified in Table 1-7.
Use for
System logic, FDD, HDD,
Display
RS-232-C Flash ROM
RAM, CPU
RS-232C
1-14
Table 1-7 Power Supply Output Ratings
DC
Name voltage
(V)
VCC +5
DSPV +10.8/+15
12V +12
B3V +3.3
-9V -9
Regulation Maximum
tolerance current
(%) (mA)
±5 3,500
±5 260
±5 70
±5 1,170
15 15
T3400/T3400CT Maintenance Manual
Ripple
(mV)
100
150
240
66
180