Service manual

10.2.2 Duplex Paper Path
The duplex feed motor is a stepper motor. The direction that the motor turns
depends on whether the duplex unit is stacking or feeding.
1. Duplex Stacking
Paper enters the duplex unit through the entrance sensor [A], the duplex turn
sensor [B], the paper feed roller [C], and the separation roller [D]. Then, it is
stacked while the bottom plate [E] is at the lower position.
2. Paper Feed from the Duplex Tray
The paper stacked in the duplex unit contacts the paper feed roller [A] after
the bottom plate [B] is lifted up. Then, the paper is fed by the paper feed
roller and goes to the registration rollers via the vertical transport roller [C].
The separation roller [D] has a one-way clutch. During paper stacking, the
separation roller turns with the paper feed roller. During paper feed, the
separation roller does not turn, so that it can separate the sheets of paper.
[E]
[A]
[B]
[C]
[D]
[C]
[A]
[D]
[B]
DUPLEX UNIT
A166/A187/A189 2-136 SM
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA