Scanning Process; Basic Procedure - Ricoh G157 Service Manual

SCANNER MECHANISM

6.2.2 SCANNING PROCESS

Basic Procedure

1. ADF scanning: Document moves across stationary CIS unit
Placing a document face up in the document feeder activates the leading edge
sensor, and the machine switches to ADF scanning. The CIS unit first moves to
the white-level reference film for white level compensation and then to the ADF
scanning position (it does this for each page).
The ADF motor then rotates the pick-up roller to pull the document into the
ADF. The feed roller feeds the pages one at a time, starting from the top
page, to the document transport 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.
Flat-bed scanning: CIS unit moves under stationary document
2.
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 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.
G157
G157D508.WMFF
6-10 SM