Service manual

EPSON Perfection 1250/1250 PHOTO Technical Overview

2.2 Control Circuit Overview

The scanner uses a single-chip, 16-bit bus CPU (IC16) which has a

transmission frequency of 20 MHz. Input image signal correction, image

processing and CCD sensor control are controlled by the ASIC (IC10). Table

2-1 describes each of the main ICs function.

Table 2-1. Description of Main ICs

IC Location Function

T224162B-35J IC1 DRAM 256 x 16bit

NM24C02M8X IC2 Reset IC

ILX555K IC4 CCD

LM9833 IC5

ASIC : Manages the following

• CCD control

• Image processing

• USB 1.1 Interface

• Stepping motor control

• Input image signal correction

• General-purpose I/O

• Programmable frequency divider

• Buffer control

NJM78M120LA-TE1 IC7 Regulator

PC1 RPI-576 CR home position sensor

SW1.2.3.4 CARBON SWITCH Push Switch

LED1 SML-020MLT

LED

Ready : Green

Error : Red