Service manual

Chapter 10
10-2
10.2 Basic Operation
10.2.1 Picking Up and Moving Originals
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The ADF picks up and moves originals under the control of the CPU on the host machine's image processor PCB
and using the drive of the ADF motor (M3).
When the host machine's Start key is pressed, with an original placed in the original tray, the ADF motor starts to
rotate counterclockwise and the pickup roller moves down to move up the original stopper. At the same time, the
original pickup roller and the original feed/separation roller start to rotate.
When the original pickup roller and the original feed/separation roller rotate, a single original is separated by the
work of the original feed/separation roller and the original separation pad, and its leading edge is detected by the
registration sensor. The original is then sent as far as the ADF registration roller; a specific period of time after the
registration sensor detects the leading edge, the ADF motor starts to rotate clockwise to move up the original pickup
roller and move down the original stopper.
The ADF motor rotates clockwise to rotate the ADF registration roller, white roller, original feed roller, and original
delivery roller to move and deliver the original.
F-10-2
10.2.2 Moving Down the Original Pickup Roller and Moving Up the
Original
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The original pickup roller is kept in up position during standby, thereby ensuring a gap used to accommodate a stack
of originals. The original stopper is kept in down position during standby to prevent the original from sliding too far
inside the machine when it is placed.
When the ADF motor (M3) rotates counterclockwise to start original pickup operation, the drive of the timing belt
moves down the original pickup roller and, at the same time, the original stopper starts to move up, causing an
original to be picked up and sent inside the machine.
ON when ADF motor rotates CCW
ON when ADF motor rotates CW
Original stopper
Original delivery roller
ADF registration roller White roller Original feed roller
ADF motor
Original
pickup roller
Original feed/separation roller