Panasonic DP-CL18 Service Manual page 110

DP-CL18
7.3.3. Developing
As the OPC drum continues to rotate, it passes by the developer roller. The developer roller is charged to a potential approximately
-200 volts (350 VAC p-p). Toner is attracted to the exposed portions of the OPC drum in reverse proportion to the negative charge.
The greatest amount of toner is transferred to the most positive potential. The developer roller rotates at 1.33 times the speed of
the OPC drum to ensure a constant supply of toner.
Inside each developer is a toner supply roller that rotates in the opposite direction from the developer roller. This supplies a layer
of toner onto the developer roller. The doctor blade smooth and evenly distributes the toner on the developer roller. Gear-driven
paddle churn the toner and keep it fluidized and moving towards the developer roller.
7.3.4. Toner Transfer to the Accumulator Belt
As the OPC drum rotates, in contact with the accumulator belt, which is rotating at the same speed. Located under the accumulator
belt at the contact point with the OPC drum, the first bias transfer roller carries a charge approximately +700 volts (FTR voltage).
This strong potential attracts and holds the toner from the OPC drum to the accumulator belt. The four color layers create while the
accumulator belt makes one complete rotation.
Any toner remaining on the OPC drum after the transfer to the accumulator belt is scraped off by the OPC drum cleaning blade,
which is always in contact with the OPC drum. This leaves the OPC drum clean for the next layer of toner to be transferred from
the developing roller into the developer.
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