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1. 8Pt:MBk SUPPLY PCB
The power supply PCB supplies de 5, 12, -22, and -9 volts to all
the components in the system.
It is an intellegent power supply using a I-chip micro-computer
and it contains the following functions.
Control and monitoring of the stored main battery. This performs
recharge control, detection of the available capacity, and that
of the low battery.
1. Monitering of AC adapter
2. Monitering of DC output voltage
3. Power on/off control of the system unit
4. Self-diagnosis of the power supply
5. Pays a role of interface with the CPU
Communication control
Reset signal generation
Low-battery signal generation
6. Display control
AC adapter connection
Battery recharge
Abnormal power supply
Output rating is as following table.
FIGURE 1-8 Power Suplly PCB
TABLE 1-6 Power Supply PCB Output Rating
FUNCTION
DC VOLTAGE
REGULATION
TOLERANCE (%)
SYSTEM LOGIC, FDD MOTOR
5
5
HOC, HOD (LOGIC)
5
5
HOD (MOTOR)
5
10
CMOS, DRAM, V-RAM, B-RAM
5
5
RS-232C, I/O SLOT
12
5
HOD
12
5
LCD
-22
5
RS-232C BUILT IN MODEM OR I/O SLOT
-9
15
1-11
MAX.
CURRENT
0.7A
O.3A
1.3A
80mA
30mA
lOrnA
lOrnA
30mA
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