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POWER SUPPLY CIRCUIT
The power supply circuit provides various voltages as shown below.
The voltage VDD (+5 V) is provided as long as batteries or AC adaptor is set.
Other voltages are controlled by APO (Auto Power Off) signal from CPU.
From
+9V ~ +12V
Batteries or
AC Adaptor
PW/ON
NMI
APO
Power Supply
— 10 —
CPU
HD6473042F16-463
APO
PA7
LSI9
NMI
PW/SW
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