Olivetti d-Color MF4003 Service Manual page 643

d-Color MF4003/MF3303
[4]
[1] Tray 2 upper limit sensor (PS2/2)
[3] Paper lift-up plate
(2) Down operation
• When the tray is slid out of the machine, the coupling of the tray 2 lift-up motor and the lift-up plate drive shaft are disconnected from
each other.
• When the driving force of the tray 2 lift-up motor is released from the lift-up plate drive shaft, the paper lift-up plate starts lowering by its
own weight.
[3]
[2]
[1] Paper lift-up lever
[3] Tray 2 lift-up motor (M2/2)
(3) Operation timing
(a) When the tray is slid in
• When the tray is slid into the machine, the tray 2 door sensor is blocked. The machine then determines that the tray is slid into position.
• The paper lift-up plate is lowering when the tray is slid out, so that the tray 2 upper limit sensor is unblocked.
• Determining after tray insertion that the tray 2 upper limit sensor is unblocked, the machine lets the tray 2 lift-up motor rotate to start
the up operation of the paper lift-up plate.
• When the paper stack is raised to a predetermined height after the paper lift-up plate up operation starts, the tray 2 upper limit sensor
is blocked.
• Determining that the tray 2 upper limit sensor is blocked, the machine stops the tray 2 lift-up motor to complete the up operation of the
paper lift-up plate.
• Control is provided to make sure that the up operation of the tray 2 is not performed together with another trays.
• If the tray 2 is slid out during the up operation of the paper lift-up plate and accordingly the tray 2 door sensor is unblocked, the up
operation of the paper lift-up plate is terminated.
(b) During a print cycle
• When the amount of paper decreases as the unit keeps printing, the pick-up roller will gradually come down to unblock the tray 2 upper
limit sensor. The tray 2 lift-up motor will rotate again to lift up the paper lift-up plate.
• When the tray 2 upper limit sensor is blocked, the tray 2 lift-up motor will stop to stop lift-up the paper lift-up plate.
• The sequence of these operations is repeated to keep constant the pressure between the pick-up roller and paper stack (paper take-
up pressure) regardless of the amount of paper still available for use.
Y119930-3
[3]
[2]
[1]
P-69
P THEORY OF OPERATION > 2. PF-P20/PF-P21
[1]
[2] Paper lift-up lever
[4] Tray 2 lift-up motor (M2/2)
[2] Coupling
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Service Manual