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CHAPTER 2. TECHNICAL DESCRIPTION
2. Outline of Circuits
2.1 Power Supply Control
The power supply is controlled by the CPU mounted on the MAIN PCB ASS’Y.
2.1.1 Power Supply Block Diagram
Fig. 2 Power System Block Diagram
BATTERY
DC/DC
CONVERTER
CPU
Reg
Reg
Reg
VBATT
FUSE
OUTPUT
1, 2
VDD2
VDD3
(12V)
(13.5V) LCD Back Light
VEE2
OUTPUT 3
OUTPUT 4
(3.3V) for RTC
Reg
for System Control
for Image
Process
(CCD etc.)
for LCD
E1, E2, E3
E21
MAIN PCB ASS'Y
VCC1 (3.3V)
VCC1A (3.3V)
VCC1SD (3.3V)
VCC2RE (4.2 V)
VCC2AFE (3.3V)
VDD (15V)
VL (-7.5V)
VBATT
for Motor Drive
VCC1A-3 (3.0V) for VIDEO OUT,
AUDIO OUT, LCD
2.1.2 Power Control Sequence
Main Switch ON (E1)
Shooting Mode Playback Mode
LCD OFF
(E2)
LCD ON
(E2, E3)
Audio/Video
out (E2)
LCD ON
(E3)
Audio/Video
out