Board Component - Epson PhotoPC 800 Service Manual

EPSON PhotoPC 800

2.1 Board Component

Major component of PhotoPC800 consists of electric circuit and lens ASSY.
Figure below shows major electric boards and explains their functions.
SY1 Board
PW1 Board
op01
Figure 2-1. Major Component
Lens ASSY. (Lens Block) has the shutter mechanism and focus mechanism.
±
Lens focus distance is 7 0.35mm and lens construction is 5 elements in 5
gourps.
The electric circuit consists of SY1 board, CA1 board, CA2 board and PW1
board. Table2-1 shows the function of each board.
Operating Principle
Lens Assy.
CA1 Board
CA2 Board
Board Component
Table 2-1. Functions of each board
Board Function
8 bit microprocessor (driven at 4MHz)
• Operation key input
• Control LCD panel display
SY1
• Manages and back up the clock
• Manages power circuits
• Controls the charging for flash
CCD image sensor interline type
• CCD clock drive
CA1
• A/D conversion of image data
• Drives Lens ASSY.
32 bit RISC-CPU (driven at 72 MHz), ASIC,
Flash ROM, SDRAM
γ
• correction
• Color signal generation
CA2
• SDRAM control
• USB control
• A/D conversion of 10 bit audio data
• Color LCD monitor control
Power supply circuit
• Switch regulator control
• Digital/analog line, 5V power output in LCD
line
• Digital 3.3V power supply output
PW1
• Digital 3.4V power supply output
• Analog/LCD line power supply output
• Back-light power supply output
• Flash power supply
PW1 board has a danger of getting electric shock because
of C5412. Hold the edges of this board and never touch the
board surface when you handle this board. Discharge the
charged energy of C5412 for safety before handling this
board. (See Chapter 4 for more details)
Revision A
33