Sharp AM-900 Service Manual page 54

AM-900U
7.7. Switching operation (3) from the sheet scan mode to the fixed scan mode
Scan unit drive side gear train
Planet gear B
Locking rib
Due to the system gear rotation, the pin B is guided in the cam groove
B to turn the planet gear B mounting arm. The planet gear B is disen-
gaged from the system gear, and the system gear loses its power.
7.8. Switching operation (4) from the sheet scan mode to the fixed scan mode
Scan unit drive side gear train
Planet gear B
The system gear is driven by the system gear biasing spring until it
reaches the stopper at the release position of the scan unit locking
lever.
Sheet scan drive side gear train
Planet gear A
(Scanner unit)
System gear biasing spring
Sheet scan drive side gear train
Planet gear A
System gear biasing spring
Motor gear
(drive source)
Clockwise rotation:
switching operation
Scan unit locking lever
Motor gear
(drive source)
Counterclockwise rotation: The scanner
unit moves toward the sheet scan position.
(Clockwise rotation: The scanner
unit moves toward the fixed scan position.)
System gear
Scan unit locking lever
3 – 7
System gear