Sharp AM-300 (serv.man7) Service Manual ▷ View online
AM-300DE
3 – 6
7.5. Switching operation (1) from the sheet scan mode to the fixed scan mode
The planet gear A moves toward the scan unit drive side gear and
stops at the intermediate position because the pin A on the planet gear
A mounting arm is restricted its movement by the cam groove A. The
planet gear B moves into engagement with the system gear so that the
system gear rotates. Along with the rotation of the system gear, the
scan unit locking lever starts rotating in the release direction.
stops at the intermediate position because the pin A on the planet gear
A mounting arm is restricted its movement by the cam groove A. The
planet gear B moves into engagement with the system gear so that the
system gear rotates. Along with the rotation of the system gear, the
scan unit locking lever starts rotating in the release direction.
7.6. Switching operation (2) from the sheet scan mode to the fixed scan mode
Rotation of the system gear releases the pin A on the planet gear A
mounting arm from the cam groove A, and the planetary gear A is
engaged with the scan unit drive side gear. The scan unit starts mov-
ing toward the fixed scan side.
mounting arm from the cam groove A, and the planetary gear A is
engaged with the scan unit drive side gear. The scan unit starts mov-
ing toward the fixed scan side.
(Scanner unit)
Locking rib
System gear biasing spring
Scan unit drive side gear train
Sheet scan drive side gear train
Scan unit locking lever
System gear
Planet gear A
Planet gear B
Motor gear
(drive source)
Clockwise rotation:
switching operation
switching operation
Clockwise rotation:
switching operation
switching operation
Motor gear
(drive source)
Planet gear B
Planet gear A
System gear
Scan unit locking lever
Sheet scan drive side gear train
Scan unit drive side gear train
Locking rib
(Scanner unit)
System gear biasing spring
AM-300DE
3 – 7
7.7. Switching operation (3) from the sheet scan mode to the fixed scan mode
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.
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
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.
reaches the stopper at the release position of the scan unit locking
lever.
(Scanner unit)
Locking rib
Scan unit drive side gear train
Sheet scan drive side gear train
Scan unit locking lever
System gear
Planet gear A
Planet gear B
(drive source)
Motor gear
Clockwise rotation:
switching operation
switching operation
System gear biasing spring
Counterclockwise rotation: The scanner
unit moves toward the sheet scan position.
unit moves toward the sheet scan position.
(Clockwise rotation: The scanner
unit moves toward the fixed scan position.)
unit moves toward the fixed scan position.)
Motor gear
(drive source)
System gear biasing spring
Planet gear B
Planet gear A
System gear
Scan unit locking lever
Sheet scan drive side gear train
Scan unit drive side gear train
AM-300DE
3 – 8
7.9. Switching operation (1) from the fixed scan mode to the sheet scan mode
When the scan unit's lever that comes back to the sheet scan position
pushes the system gear pin, the system gear starts rotating in clock-
wise direction.
pushes the system gear pin, the system gear starts rotating in clock-
wise direction.
7.10. Switching operation (2) from the fixed scan mode to the sheet scan mode
Due to the system gear rotation, the pin B on the planet gear mounting
arm is guided in the cam groove B, and the planet gear B is engaged
with the system gear. Along with the system gear rotation, the scan
unit locking lever moves toward the lock position.
arm is guided in the cam groove B, and the planet gear B is engaged
with the system gear. Along with the system gear rotation, the scan
unit locking lever moves toward the lock position.
Pin
Lever
Scanner unit
System gear
Scan unit drive side gear train
Sheet scan drive side gear train
Scan unit locking lever
Planet gear A
Planet gear B
System gear biasing spring
(drive source)
Motor gear
Counterclockwise rotation: The scanner
unit moves toward the sheet scan position.
unit moves toward the sheet scan position.
Scanner unit
Pin A
Pin B
Cam groove A
Cam groove B
Lever
Pin
System gear
Scan unit drive side gear train
Sheet scan drive side gear train
Scan unit locking lever
Planet gear A
Planet gear B
System gear biasing spring
(drive source)
Motor gear
Counterclockwise rotation: The scan
unit moves toward the sheet scan position.
unit moves toward the sheet scan position.
AM-300DE
3 – 9
7.11. Switching operation (3) from the fixed scan mode to the sheet scan mode
Rotation of the system gear releases the pin A on the planet gear A
mounting arm from the cam groove A. The planet gear A moves to the
intermediate position between the scan unit drive side gear and the
sheet scan drive side gear. At this time, the belt stops moving, and the
scan unit stops accordingly just before the sheet scan position.
mounting arm from the cam groove A. The planet gear A moves to the
intermediate position between the scan unit drive side gear and the
sheet scan drive side gear. At this time, the belt stops moving, and the
scan unit stops accordingly just before the sheet scan position.
7.12. Switching operation (4) from the fixed scan mode to the sheet scan mode
Rotation of the system gear releases the pin B on the planet gear B
mounting arm from the cam groove B, and the planet gear B is disen-
gaged from the system gear. After the disengagement, the system
gear is kept rotating in clockwise direction by the system gear biasing
spring. The scan unit locking lever is moved by the system gear, and it
stops after pushing the scan unit to the locking rib. Keep rotating the
motor in the counterclockwise direction for the sheet feeding opera-
tion.
mounting arm from the cam groove B, and the planet gear B is disen-
gaged from the system gear. After the disengagement, the system
gear is kept rotating in clockwise direction by the system gear biasing
spring. The scan unit locking lever is moved by the system gear, and it
stops after pushing the scan unit to the locking rib. Keep rotating the
motor in the counterclockwise direction for the sheet feeding opera-
tion.
Counterclockwise rotation:
switching operation
switching operation
Lever
Scan unit
Cam groove A
Pin A
Motor gear
(drive source)
System gear biasing spring
Planet gear B
Planet gear A
Scan unit locking lever
Sheet scan drive side gear train
Scan unit drive side gear train
System gear
Pin
(Scanner unit)
Locking rib
Counterclockwise rotation: Sheets
are fed to the sheet scan section.
are fed to the sheet scan section.
System gear biasing spring
Scan unit drive side gear train
Sheet scan drive side gear train
Scan unit locking lever
System gear
Planet gear A
Planet gear B
(drive source)
Motor gear
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