Outline Of Circuits; Power Supply Control; Power Supply Block Diagram; Power Control Sequence - Canon PowerShot S230 Service Manual

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

VBATT
BATTERY
FUSE

2.1.2 Power Control Sequence

E1, E2, E3
DC/DC
CONVERTER
OUTPUT
1, 2
OUTPUT 3
OUTPUT 4
Fig. 2 Power System Block Diagram
Main Switch ON (E1)
Shooting Mode
Audio/Video
LCD OFF LCD ON
(E2) (E2, E3) out (E2)
MAIN PCB ASS'Y
E21
CPU
VCC1 (3.3V)
VCC1A (3.3V)
VCC1SD (3.3V)
VDD2
VDD (15V)
Reg
VEE2
VL (-7.5V)
VCC2RE (4.2 V)
VCC2AFE (3.3V)
VDD3
(12V)
Reg
(13.5V) LCD Back Light
VCC1A-3 (3.0V) for VIDEO OUT,
Reg
VBATT for Motor Drive
(3.3V) for RTC
Reg
Playback Mode
Audio/Video
LCD ON
(E3) out
2-2
for System Control
for Image
Process
(CCD etc.)
for LCD
AUDIO OUT, LCD