Driver circuit4CMOS sesor channel x 43211872 pixels7488 pixels■ Enlargement/Reduction● Magnifications in Main Scanning Direction• In book mode/ADF modeAn image is read at 100% in main scanning direction. Magnification variation and its data process are controlled on maincontroller PCB.● Magnification Change in Horizontal Scan DirectionIn the horizontal scan direction, magnification is changed as follows depending on the selected magnification rate:1. When magnification is reduced to 50-99%• In the Book modeData is processed on the main controller PCB with the original scan speed held at 61.5 mm/sec or 123 mm/sec.• When the ADF is usedThe original feed speed is changed within the range of 61.5 mm/sec or 123 mm/sec to 246 mm/sec depending on theselected magnification rate. Data is not processed on the main controller PCB.2. When magnification is increased to 100-200%The original scan speed (in the Book mode)/original feed speed (when the ADF is used) is changed within the range of 123mm/sec to 61.5 mm/sec depending on the selected magnification rate. Data is not processed on the main controller PCB.■ Detecting the Size of Originals● OverviewThe original size is identified by the combination of presence and absence of output levels of the reflection type sensors assummarized in the tables below.• Absence of paper: The light reflected from the reflection type sensor changes when the copyboard cover is open/close.• Presence of paper: The light reflected from the reflection type sensor does not change when the copyboard cover is open/close.This machine is provided with the following sensors. Locations of the sensors are shown below.• Vertical scan direction: Reflection type photo sensors (2 locations for AB; 1 location for Inch)• Horizontal scan direction: Reflection type photo sensors (2 locations for AB; 2 locations for Inch)2. Technical Explanation29
