Ricoh SP 8400DN Field Service Manual page 1390

Ricoh a3 size black and white laser printer.

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7.Detailed Descriptions

OPC Drum Drive Mechanism

The drum/waste toner motor [B] drives the OPC drum [A] through gears and the drum drive shaft [C].

Charging to the drum is performed by the charge roller [B]. The charge roller always contacts the surface of the

drum and applies a charge bias.

A power pack applies the bias to the charge roller via a receptacle and electrode terminal. Dirt can easily adhere to

the charge roller because the roller always contacts to the drum with the pressure spring. Therefore, the brush

roller [A] is in contact with the charge roller for cleaning.

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