Operation Principle Of Electric Circuit - Epson Perfection 4490 photo Service Manual

EPSON Perfection 4490 Photo

2.3 Operation Principle of Electric Circuit

The following electric circuits are used in the scanner.
Main Board
Table 2-1. Main Board IC
Name Location
S1R77001F00A2 IC4
S1R720G0F00A0 IC6
EDS6416AHTA-75-E IC3
TB62205F IC1
AP1120SLA IC2
M74HC595AM13TR IC5
CCD Board
Table 2-2. CCD Board IC
Name Location
ILX580K IC1
AK8415 IC4
E02A41YA IC5
SN74ACT244NSR IC2, IC3
KIA78M05F-RTF/P IC6
Panel Board
This board has four buttons (Start/Copy/Scan to E-mail/Scan to PDF) and LED
lamp.
OPERATING PRINCIPLES
Details
ASIC: Host base scanner controller
ASIC: UTM (USB2.0 interface)
SDRAM 1M x16bit x4bank
Motor Driver + DC-DC converter CR Motor Drive
+24V IN, +12V/+5V OUT
DC-DC converter
+5V IN, +3.3V/+2.5V OUT
Serial-Parallel converter
Details
CCD
16bit A/D converter
ASIC: CCD/AFE drive signal generator
CCD drive buffer
DC-DC converter
+12V IN, +5V OUT
Operation Principle of Electric Circuit
Power supply
The scanner is powered with 24 VDC voltage from the AC adapter.
AC adapter rated voltage
Rated output DC24 1.1A
•
Input Voltage AC100-120V ± 15% (100V)
•
AC220-240V ± 10% (200V)
Rated Input Current 0.7A (AC 100V system)
•
0.4A (AC 200V system)
Input Frequency Range 50 to 60Hz ± 0.3Hz
•
Output Voltage DC24 to 26.4V
•
The 24 VDC voltage is supplied to CN4 on the Main Board. A power switch is located
between the DC jack and the Main Board.
DRV Board (TPU Unit)
Table 2-3. DRV Board IC
Name Location
M74HC595RM13TR IC1, IC2
LB11847L-E IC3
CD74HC75M96 IC5
ADF Board (Option)
Table 2-4. ADF Board IC
Name Location
M54670P IC2
MM74HC165M IC3
M66311FP-250D IC1
MM74HCT04M IC4
Revision B
Details
8bit Shift Register
TPU CR Motor Driver
Lamp/LED controller
Details
ADF Motor driver
Parallel-Serial Converter
Serial-Parallel Converter
Buffer IC
24