ASSY - Page 50

Confidential

3 - 5

(1)  ADF scanning: Document moves across stationary CIS unit 

Placing a document 

face up 

in the document support activates the document front sensor,  

switching to ADF scanning. 

The CIS drive mechanism (details below) operates for each scanning command executed. 
The CIS unit first moves to the white-level reference film for white level compensation and  
then to the ADF scanning position. 

The ADF motor then rotates the document pull-in roller to pull the document into the ADF.  
The document separation roller feeds the pages one at a time,

 starting from the top,

 to the  

document feed roller, which rotates to move the page in a curve left, down, and right. 
The page is scanned as it passes over the CIS unit.  It then leaves the machine 

face down

 onto  

the document cover.  The machine inserts subsequent pages under this one to preserve the  
document page order. 

(2)  Flat-bed scanning: CIS unit moves under stationary document 

The user lifts the document cover, places a page (or open book) 

face down

 on the glass plate,  

and closes the document cover. 

The CIS drive mechanism (details below) operates for each scanning command executed. 
The CIS unit first moves to the white-level reference film for white level compensation. 
It then moves right, scanning as it goes.  It returns to its home position after the scan. 

CIS drive mechanism 

The contact image sensor (CIS) unit rides along the CIS rail driven by the CIS drive belt.  
Clockwise motion of the CIS motor moves the unit to the left; counterclockwise motion, to the  
right.  This unit consists of the document illumination LED array, the self-focus lens array  
gathering the light reflected from the scanned image, the CIS PCB converting the light input to  
pixel data output, and a glass cover.  

The CIS unit is the type in which color reading is possible. While reading the color stationary 
document, the LED array with red, green, blue ( RGB ) lights up the 3 colors alternately. While 
reading the monochrome document, only the green color of the LCD array will be lighten up.