Ricoh SP 8400DN Field Service Manual page 1418

7.Detailed Descriptions
Bypass feed section
No.
1 Bypass paper end sensor
2 Bypass paper feed roller
3 Bypass pick-up roller
Bypass feed paper/separation mechanism
The manual paper feed mechanism employs an FRR system. The bypass feed unit comprises a paper feed roller,
reverse roller and bypass pick-up roller.
When the paper feed tray is selected and the machine is started, the bypass pick-up solenoid is switched OFF, and
paper is supplied by the duplex/bypass motor (CCW).
*1 The bypass pick-up roller does not come in contact with the paper surface by default. It is opposite to the paper
feed tray.
Bypass feed paper size detection
Paper size width detection is performed by a bypass feed size detection switch (rotary switch).
The bypass feed size detection switch has a rotation plate which rotates together with the side fence of the bypass
feed table, and detects the paper size.
Paper portrait/landscape is determined by a length detection sensor.
Two feelers [A] for the bypass length sensor [B] are added to the rear of the tray to prevent a false detection in
paper length detection caused by floating on the rear of paper when large size paper is set without pulling out the
extension bypass tray.
680
Description No.
4 Bypass/Duplex motor
5 Bypass Reverse roller
6 Paper detection feeler
Description