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2-2
CHAPTER 2. TECHNICAL DESCRIPTION
2. Outline of Circuits
2.1 Power Supply Control
The power supply is controlled by the CPU and DSP mounted on the MAIN PCB ASS’Y.
2.1.1 Power Supply Block Diagram
Fig. 2 Power System Block Diagram
2.1.2 Power Supply Control Sequence
1) In the case of either "Battery is Installed" or External Power is Supplied to "DC-IN" connector;
2) In case that Dial Switch is in "LOCK" position when "Battery is Installed";
CPU activates the other main functions. (E0, E1)
Operating the Dial Switch
Rec. Mode
Play Mode
1. Controls CCD (E2)
2. Controls LCD (E3)
3. Controls LCD backlight (E3)
1. Controls LCD (E3)
2. Controls LCD backlight (E3)
Battery charging operation starts when external power is supplied to "DC-IN" connector.
DC/DC CONVERTER
PCB ASS’Y
MAIN PCB ASS’Y
DC/DC
CONVERTER
D14
Q54
Q22
E0, E1 CONTROL
E2, E3
CONTROL
E4
E21
DC-IN
VDD0_3.3
VDD0_12-1.5
VDD2_5.5
VDD2_15
VDD2_N7.5
VDD3_12.3
VDD3_20
VBATF
VBAT
VDD4_5.0
REG
REG
REG
DSP
CPU
for System with CPU
for DSP
for CCD
for CCD
for LCD Backlight
for VIDEO Amp
for Motor Drive
BATTERY
CHARGE
CONTROL
E0 OUTPUT
E1 OUTPUT
E2 OUTPUT
E3 OUTPUT
Summary of Contents for PowerShot G3
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Page 35: ...1 29 3 2 6 dimensional Diagram 69 9 2 75 43 5 1 71 122 0 4 80 71 7 2 82 73 9 2 91 121 0 4 76 ...
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Page 132: ......
Page 135: ...PowerShot G3 Pg2 INTERNAL PARTS SECTION 1 See Pg3 See Pg5 8 8 7 1 2 3 4 9 7 10 8 11 5 6 N S ...
Page 139: ...PowerShot G3 Pg4 TOP COVER SECTION 17 15 16 1 3 7 2 4 5 6 8 15 9 10 11 12 13 14 ...
Page 141: ...PowerShot G3 Pg5 EVF UNIT SECTION 1 10 2 5 3 7 12 11 12 4 6 8 13 9 a b a d c b d c ...
Page 143: ...PowerShot G3 Pg6 BATTERY BOX UNIT SECTION 8 4 8 2 3 7 1 5 8 8 8 6 ...
Page 145: ...PowerShot G3 Pg7 Fuse 2 1 DC DC CONVERTER PCB ASS Y ...
Page 156: ......
Page 170: ...C CANON INC 2002 01 NOVEMBER 2002 3 4 HV MODULE UNIT ...
Page 171: ...C CANON INC 2002 01 NOVEMBER 2002 3 5 TOP MODULE UNIT ...
Page 172: ...C CANON INC 2002 01 NOVEMBER 2002 3 6 LCD PCB ASS Y ...
Page 173: ...C CANON INC 2002 01 NOVEMBER 2002 3 7 OPTICAL FLX ...
Page 174: ...C CANON INC 2002 01 NOVEMBER 2002 3 8 EF FLX ...
Page 175: ...C CANON INC 2002 01 NOVEMBER 2002 3 9 R_EN FLX ...
Page 178: ...PowerShot G3 Auto Focus Chart 1 ...
Page 179: ...Dimensions 1 107 1mm 79 1mm Dimensions 1 ...
Page 180: ...PowerShot G3 Auto Focus Chart 2 ...
Page 181: ...Dimensions 2 278 46mm 207 66mm ...
Page 182: ...PowerShot G3 Auto Focus Chart 1 ...
Page 183: ...Dimensions 1 107 1mm 79 1mm Dimensions 1 ...
Page 184: ...PowerShot G3 Auto Focus Chart 2 ...
Page 185: ...Dimensions 2 278 46mm 207 66mm ...