Tray Base Plate Lift - Ricoh PB3280 Field Service Manual

The paper feed motor (M2) turns ON, and supplies the first sheet.
1.
To prevent transport of the next sheet, the pickup solenoid (SOL1) switches ON just before the
2.
trailing edge of the first sheet leaves the Pickup roller, and the Pickup roller separates from the
paper surface.
Just before the trailing edge of the first sheet leaves the paper feed motor (M2), the paper feed
3.
motor (M2) switches OFF.
However, at this time, when the paper feed sensor (S1) detects no sheet (when the second sheet
is not transported to the paper feed sensor position), pre-feed is performed without switching the
Paper feed motor OFF.
Pre-feed is as follows.
The pickup solenoid (SOL1) switches OFF, and the second sheet of paper is transported to the
1.
paper feed sensor position.
When the trailing edge of the second sheet passes the Feed roller, the paper feed motor (M2)
2.
is switched OFF. The pickup solenoid (SOL1) remains OFF.
Just before the trailing edge of the first sheet passes the Feed roller, the pickup solenoid (SOL1) is
4.
switched OFF, and the pickup roller is brought in contact with the paper surface.
When the first sheet is transported a predetermined distance by the downstream transport roller,
5.
the paper feed motor (M2) is switched ON to supply the second sheet.

Tray Base Plate Lift

When the paper feed tray is set in the main unit, the tray set detection switch (SW2) switches ON, and it
is detected that the tray is set. At this time, the coupling of the lift motor engages with the shaft at the
rear of the tray, the motor rotates, and the tray base plate is lifted up. The paper surface pushes up the
pickup roller, the tray base plate is lifted until the upper limit sensor (S4) switches OFF (blocked), and
the printer enters the standby mode.
When the paper feed tray is removed, the coupling is disengaged, and the base plate descends. At this
time, the tray lift motor (M3) rotates until the coupling returns to the home position.
1.Detailed Descriptions
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