Outline Of Circuits; Power Supply Control; Power Supply Block Diagram; Power Control Sequence - Canon PowerShot A30 Service Manual
Hide thumbs
Also See for PowerShot A30:
- User manual (183 pages) ,
- Guide utilisateur (183 pages) ,
- Service manual (130 pages)
Table of Contents
Advertisement
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
BATTERY
or
DC_IN
VBATT
FUSE
2.1.2 Power Control Sequence
Shooting Mode
LCD OFF
(E2)
E1, E2, E3, E4
DC/DC
CONVERTER
E1
OUTPUT
E2
OUTPUT
E3 or E4
OUTPUT
Fig. 2 Power System Block Diagram
Main Switch ON (E1)
Audio*/Video
LCD ON
(E2, E3)
out (E2,E4)
* A40 Model only
MAIN PCB ASS'Y
CPU
REG
VCC1L (2.5V)
VCC1 (3.3V)
VCC1A (3.3V)
VCC1M
(3.3V)
for Motor Drive
VDD2
(15V: A40 / 15.5V: A20 Model)
VEE2
(–7.5V: A40 / –8.0V: A20 Model)
VCC2
(4.2V)
VDD34
(13.5V)
VCC34
(4.2V: E3/5V: E4)
E3: LCD
E4: Video
VCC34
(5V)
for AUDIO OUT
(A40 Model Only)
VCC1A
(3.3V)
REG
(3.3V) for RTC
Playback Mode
Audio*/Video
LCD ON
(E3)
out (E4)
2-2
for System Control
for Image
Process
(CCD etc.)
for LCD, VIDEO OUT
Advertisement
Chapters
Table of Contents
