Ricoh IS450S Service Manual page 24

SCANNER MECHANISMS 22 December 1998
[I]
[H]
G411D519.WMF
When the first original is being fed, the bend in the lift shaft is pointing up, and the
spring is at maximum compression. As sheets of the document are scanned, the
spring pushes the document table upwards so that the top of the stack is always
against the pick-up roller.
When all pages of the original have been fed out of the ADF, the document table
lift clutch and paper feed motor are energized to lower the tray. They turn off when
the document table sensor is deactivated. If the sensor is not deactivated within the
designated time, a document table error will occur.
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