Control Circuit; Outline Of Control Circuit Operation - Epson Perfection 3200 Photo Service Manual

EPSON Perfection 3200 Photo

2.3 Control Circuit

2.3.1 Outline of Control Circuit Operation

The control circuits for this scanner are as follows. (See Figure 2-6, "Control
Circuit Block Diagram".)
Main circuit board
Table 2-3. Major ICs
IC Location
E01A23EA IC1
IS61LV256AH-15J IC4
M27W402-100B6 IC3
HY57V281620AT-S
or IC2
K4S281632C-TC1L
A3957SLB IC12,IC13
ISP1581 IC14
TSB43AA82 IC5
AT93C46-10SCTE IC15
Operating Principles
Function
System LSI
• CPU
• Image processing ASIC
• USB 1.1 interface
• Stepping motor controller
• Programmable frequency
divider
• Multi-purpose I/O
SRAM
OTPROM
Image processing SDRAM
Carriage motor driver with
wireless-type 4-bit DAC
USB 2.0 controller
USB 2.0 interface controller
Full speed (12 Mbit/sec)/high
speed (483 Mbit/sec) support
IEEE 1394 controller
EEPROM
Control Circuit
CCD circuit board
Table 2-4. Major ICs
IC Location
ILX137K IC5
AD9826 IC2
E02A38YA IC3
SUB_A circuit board (power switch)
Power supply circuit board
Switch: SPPJ22D19A
SUB_B circuit board (LED)
LED circuit board (Built into Lid TPU)
LED: READY LED (blue) DB3804X
ERROR LED (red) BR3874X
Panel circuit board (pushbutton)
Pushbutton circuit board
Switch: EVQPEE04M
Power supply
100V: MPW0837
200V: MPW0708
Revision A
Function
CCD
• 64,200-pixel (10,700 pixels x 6), 6-
line CCD color linear sensor
• Pixel size 4 µm x 4 µm
• Channel top width 1.6 µm
• Line interval: 2 lines (4 µm) between
same colors, 16 lines (64 µm)
between different colors
AFE
CDS 3CH
ADC 16bit
CCD/AFE clock generator ASIC
Variable point for each bit of AFE digital
output is varied at random
21