Cis Drive Mechanism - Ricoh G157 Service Manual

SCANNER MECHANISM

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, and
counterclockwise motion moves it to the right.
The CIS unit consists of the document illumination LED array, the self-focusing
lens array (this gathers the light reflected from the scanned original), the CIS PCB
(this converts the light input to pixel data output), and a glass cover.
The CIS unit can scan color documents. When scanning a color document, the unit
turns on the three-color LED lines of red, green and blue (R, G, B) alternately and
illuminates the document. When scanning a black/white document, it turns on the
green LED line only to scan.
SM 6-11 G157