Photoconductor Units (PCU)
D014/D015/D078/D079 6-28 SM
Development method: Dual-component development
Agitation: Two augers
Development unit drive:
Development motor, one for each development unit
(Y, C, M, K)
Development bias: Development bias power pack
Development Unit Operation
When the development unit is filled with new developer from the developer bottle, all the
developer falls into the unit across its full length. Toner is supplied through a small port at
the front of the development unit.
The toner enters the toner supply port [1].
The development auger [2] cross-mixes the developer and toner sent from the STC, and
then sends this mixture to the supply auger [3] next to the development roller [4]. The
magnetic development roller pulls the developer-toner mixture onto its surface as it rotates.
Near the top of the development unit, the doctor blade [5] cuts and smoothes the
developer/toner mixture to the correct thickness. The development bias power pack (not
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