Camera Control Circuit Board; Power Source Circuit Board - Canon EOS 5D Service Manual

⑴Digital control circuit board
This board is a highly-integrated, 10-layer (3-4-3) board. It contains the following: The
ADIC that converts the output from the CMOS sensor into digital signals, the imaging
signal processing circuit which includes the TG IC that generates the CMOS sensor's drive
pulse, the digital image processing circuit that includes DIGIC II, the memory circuit that
includes the DDR SDRAM for the image buffer memory, the USB port, and the video OUT
terminal.
The board's number 2 and 9 layers are basically GND layers to prevent signal
interference between the top and bottom patterns and internal layers and to prevent
misoperation caused by noise.

⑵Camera control circuit board

This board has four layers fitted with the following: The microcomputer IC which
controls the camera operation by controlling the various sensors and mechanical
components, the AFcontrol IC, the flash-control IC, and EEPROM that retains various
adjustment data (AE, AF, etc.).
⑶Display control circuit board
This board has four layers fitted with the following: LCD panel, viewfinder display,
display IC that drives and controls the superimposed display, motor driver IC, and power
source circuit to supply power to the camera control circuit board.

⑷Power source circuit board

This board has four layers fitted mainly with a power source circuit to supply power to
the digital control circuit board.
５） Compliance to RoHS directive (Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment)
The RoHS directive will ban the use of the following six toxic substances in any electrical
and electronic equipment: Lead, mercury, cadmium, hexavalent chromium, polybrominated
biphenyl, and polybrominated diphenyl ether. It will take effect from July 1, 2006 and be
applied to products sold in the EU. The EOS 5D meets this directive.
Note: RoHS directive: Restriction of the use of certain Hazardous Substances in electrical and electronic equipment.
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Technical Information