Canon EOS D60, Service Manual

Page: 76 / 211

Part 2: Technical Information
2-23
4.4 Video Signal
1) A PCB
The C-MOS sensor drive pulses are generated by the TG circuit that is operated
by the clock signal from the DSP and by the sync signal.
The video signal is output from the C MOS sensor when it is driven by the drive
pulse. The output video signal from C MOS is converted to the digital data by the
A/D converter, passes through the TG circuit and is sent to DSP of the D PCB.
2) D PCB
The DSP circuit performs the following signal processing.
•
Processes the video data. (Using the SDRAM)
•
Writes and reads the video data to and from the CF card.
•
Outputs the video data to the CPU.
•
Outputs analog video signal to the LCD and VIDEO OUT.
3) TFT PCB
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 a jack is
inserted into the video jack and drives the 75 ohm video signal.
4) Selecting the ISO sensitivity
The C-MOS sensor gain is switched by changing the amplifier gain (supporting
ISO100 to 400) on the A PCB and the DSP amplifier gain (supporting ISO800 to
1600).
Fig. 2-34
DRIVE PULSE
HD,VD
CLK
A PCB D PCB
TFT PCB
C MOS
SENSOR
AMP A/D
TG
SDRAM
DSP
CPU
CF
CARD
LCD
DRIVER
VIDEO
AMP
TFT
LCD
VIDEO
OUT
USB