Lexmark Optra C710 Service Manual page 64

5016-001
When paper is fed from the 2nd paper option, the chassis side input
gear rotates in [B] direction. The drive is transmitted to the one way
gear 16Z through the store roller drive shaft, rotating the one way
gear 16Z in the [B] direction.
Note: Drive is not transmitted when the rotation is in the [A]
direction, due to the one way clutch [A]. The timing belt drives,
turning the idler rollers in the [B] direction, while transporting the
page in the [B] direction.
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Service Manual