CH2E.pdf

(96 KB) Pobierz
598872367 UNPDF
CHAPTER 2. TECHNICAL DESCRIPTION
CONTENTS
1. Functions of each unit
1.1 MAIN PCB ASS’Y --------------------------------------------------------------------------------------------------------- 2-1
1.2 DC/DC CONVERTER PCB ASS’Y ------------------------------------------------------------------------------------- 2-1
1.3 LCD PCB ASS’Y ----------------------------------------------------------------------------------------------------------- 2-1
1.4 TOP MODULE UNIT ------------------------------------------------------------------------------------------------------ 2-1
1.5 EF FPC ----------------------------------------------------------------------------------------------------------------------- 2-1
1.6 STJ PCB ASS’Y ------------------------------------------------------------------------------------------------------------ 2-1
2. Outline of Circuits
2.1 Power Supply Control ------------------------------------------------------------------------------------------------------ 2-2
2.1.1 Power Supply Block Diagram ----------------------------------------------------------------------------------- 2-2
2.1.2 Power Supply Control Sequence -------------------------------------------------------------------------------- 2-2
2.2 Signal Processing ------------------------------------------------------------------------------------------------------------ 2-3
2.2.1 System Control ----------------------------------------------------------------------------------------------------- 2-3
2.2.2 Picture Processing ------------------------------------------------------------------------------------------------- 2-4
2.2.3 Audio Processing (Recording and Playback Functions) ------------------------------------------------------ 2-4
3. Troubleshooting ------------------------------------------------------------------------------------------------------------------- 2-5
3.1 When an Error Code is Displayed ---------------------------------------------------------------------------------------- 2-5
3.2 When a Problem Occurs ---------------------------------------------------------------------------------------------------- 2-7
 
CHAPTER 2. TECHNICAL DESCRIPTION
1. Functions of each unit
1.1 MAIN PCB ASS’Y
1) Driving the CCD Sensor.
2) Conversion of the image signal from the analog signal to the digital signal.
3) Controlling the power supply and the system by CPU. (Refer to Sections 2.1 and 2.2.)
4) Image processing, and reading and writing the image signal to and from the CF card using DSP.
(Refer to Section 2.2.2.)
5) Video output. (Refer to Section 2.2.2.)
6) Microphone input and sound output. (Refer to Section 2.2.3.)
1.2 DC/DC CONVERTER PCB ASS’Y
1) Power supply drive (DC/DC converter).
2) Battery charging control circuit.
1.3 LCD PCB ASS’Y
1) Image display.
2) Backlight for LCD drive.
1.4 TOP MODULE UNIT
1) Operation switch, operation display and finder LED.
1.5 EF FPC
1) Flash control.
1.6 STJ PCB ASS’Y
1) Flash drive and charging circuit for the flash.
BUTTON PCB ASS'Y
TOP MODULE UNIT
LCD PCB ASS'Y
MAIN PCB ASS'Y
DC/DC CONVERTER PCB ASS'Y
FLASH UNIT
Fig. 1
2-1
598872367.012.png 598872367.013.png
 
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
DC/DC CONVERTER
PCB ASS’Y
MAIN PCB ASS’Y
E0, E1 CONTROL
CPU
E2, E3
CONTROL
DSP
REG
D14
DC/DC
CONVERTER
DC-IN
E0 OUTPUT
E1 OUTPUT
VDD0_3.3
VDD12-1.5
VDD2_5.5
VDD2_15
VDD2_N7.5
for System with CPU
for DSP
BATTERY
CHARGE
CONTROL
E2 OUTPUT
REG
for CCD
E3 OUTPUT
VDD3_12.3
VDD3_20
for CCD
for LCD Backlight
for VIDEO Amp
Q54
REG
VDD4_5.0
Q22
VBATF
VBAT
for Motor Drive
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;
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)
2) In case that Dial Switch is in "LOCK" position when "Battery is Installed";
Battery charging operation starts when external power is supplied to "DC-IN" connector.
2-2
598872367.001.png 598872367.002.png 598872367.003.png 598872367.004.png
CHAPTER 2. TECHNICAL DESCRIPTION
2.2 Signal Processing
MAIN PCB ASS'Y
SDRAM
CF card
HD, VD
CLK
Drive Pulse
TG
DSP
LCD
Driver
LENS
CCD
Sensor
CDS, A/D
LCD
Motor Driver
Video
Amp
AV OUT
AF Support LED
FINDER LED
FLASH MEMORY
USB
CPU
RTC
Audio
Amp
SPEAKER
MIC
MIC Amp
BUZZER
Electric FLASH
SW
DIAL
KEY
Fig. 3 Signal System Block Diagram
2.2.1 System Control
The CPU on the MAIN PCB ASS’Y controls the lens (motor, shutter), microphone input, operation switch
receiver, USB communication and flowing circuits.
• TG: Creation of the CCD drive pulse
• CDS, A/D: CCD signal processing and conversion of the digital data
• LCD Driver: Driving the LCD
• FLASH MEMORY: Firmware and adjustment data memory
• DSP: Picture processing
• RTC: Clock count for watch
• AF Support LED: AF auxiliary, self-timer and red-eye protection also serves as a lamp
• Electric Flash: Flash and charging circuit
2-3
598872367.005.png 598872367.006.png 598872367.007.png 598872367.008.png 598872367.009.png 598872367.010.png 598872367.011.png
CHAPTER 2. TECHNICAL DESCRIPTION
2.2.2 Picture Processing
1) The drive pulse of the CCD sensor is created by both clock from DSP and TG that is operated by
sync. signal.
The picture signal by the drive pulse is output from CCD sensor.
The output signal of the CCD picture is converted to the signal processing and the digital data by
the CDS and A/D converter, and is sent to the DSP.
2) The DSP circuit performs the following signal processing.
• Processes the picture data (using the SDRAM).
• Writes and reads the picture data to and from the CF card.
• Outputs the picture data to the CPU.
• Outputs analog video signal to the LCD and VIDEO OUT.
3) The video signal that is supplied form the DSP is controlled by the LCD driver and is displayed
on the LCD. The video amplifier is activated when the AV jack is inserted to the video jack and
drives the video signal in 75
.
2.2.3 Audio Processing (Recording and Playback Functions)
1) During recording of moving picture
• Audio signal of microphone is converted to digital data by CPU and is recorded.
2) During playback, it is converted back to analog audio signal by CPU and is output from speaker
and AV jack.
2-4
Ω

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin