Ricoh IS450S Service Manual page 19

22 December 1998 SCANNER MECHANISMS
Basic Scanning Procedure
When the scan command is received from the host computer, the scanner starts
scanning as explained in the following steps.
[G]
[A]
[E]
[B] [C]
[F]
[D]
G411D524.WMF
Initialization
The scanner checks the home position, scanner cover, and memory. If an error is
detected, the scanner motor will stop.
The scanner scans the white plate [A] on the underside of the ADF exposure cover
to perform the shading function.
Image Scanning
The scanner starts to scan the image area at the designated position [B]. The
scanner stops after scanning the designated image area [C]. The arrows indicate
that the scan start position and image area depend on the settings input by the
user.
Scanner Reversing
After the image has been scanned, the scanners return to the home position [D].
The scanners are stopped when the first scanner activates the home position
sensor [E]. If the scanner home position sensor is not activated within a certain
time, a home position sensor error will occur.
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