PCDU

Drive

The PCDUs are driven by the black imaging motor [1], and the color imaging motor [2].

Development

The development mechanism contains the development roller [1], the toner supply roller [2], and the development blade. The toner supply roller [2] provides the development roller [1] with toner. The electrostatic latent image on the surface of the PCDU takes on toner and turns into a visible toner image. The development blade [3] keeps the toner attached on the development roller [1] flat.

Charge, Charge roller cleaning, OPC Cleaning

This machine uses a charge roller [1]. The charge roller gives the drum surface a negative charge. The high voltage supply board, which is at the left side of the machine, applies dc and ac voltage (at a constant current) to the roller. The ac voltage helps to make sure that the charge given to the drum is as constant as possible.

The machine automatically controls the charge roller voltage when process control is done. The charge roller cleaner [2] which always touches the charge roller, cleans the charge roller. The OPC cleaning blade [3] removes the waste toner on the OPC.

Toner Mixing

The toner moves as shown in the following drawing. The upper mixing coil [1] moves the toner to the left side. The lower mixing coil [2] moves toner to the right side. Finally, the toner supply roller [3] supplies toner to the development roller [4].

Waste toner

Toner waste within each PCDU is collected by the waste toner collection coil and sent down to the waste toner bottle.

New PCDU detection, and Set detection

A terminal mounted on the side of the cover detects when a new PCDU is inserted. If a new PCDU comes into contact with the three-point terminal, a fuse is opened, and the machine detects the new PCDU.

1. Fuse Resistance
2. New PCDU Detection
3. Set Detection and New PCDU Detection