Epson FilmScan 200 Service Manual page 33

2.1 ENGINE OPERATION............................................................................................2-1
2.1.1 Scanner Head Operation........................................................................................................ 2-1
2.1.1.1 Photosensitive Section .............................................................................................. 2-2
2.1.1.2 Transmission Section ................................................................................................ 2-3
2.1.2 Carriage Operation ................................................................................................................. 2-4
2.1.2.1 Film Carrier Preview Scanning.................................................................................. 2-4
2.1.2.2 Film Carrier Main Scanning....................................................................................... 2-5
2.1.2.3 APS Holder Preview and Main Scanning .................................................................. 2-5
2.2 POWER SUPPLY OPERATION .............................................................................2-8
2.2.1 Power Supply Overview......................................................................................................... 2-8
2.2.2 Circuit Operation .................................................................................................................... 2-9
2.3. CONTROL CIRCUIT ...........................................................................................2-10
2.3.1 Control Circuit Outline ......................................................................................................... 2-10
2.3.2 Reset Circuit.......................................................................................................................... 2-13
2.3.3 Photo Sensor Circuit ............................................................................................................ 2-13
2.3.4 Preview and Main Scan Motor Drive Circuits .................................................................... 2-14
2.3.4.1 Main Scan Motor Drive Circuit................................................................................. 2-15
2.3.4.2 Preview Motor Drive Circuit ..................................................................................... 2-16
2.3.5 Image Sensor Drive Circuit.................................................................................................. 2-17
OPERATING PRINCIPLES
CHAPTER 2