Ricoh SP 8400DN Field Service Manual page 1393

Ricoh a3 size black and white laser printer.

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7.Detailed Descriptions

Development Mechanism

This machine uses a dry two-component magnetic brush development system.

This machine uses 2 mixing augers [C] and [D] to keep the developer evenly mixed. Mixing auger 2 [C]

transports excess developer, scraped off the development roller by the doctor blade [B], towards the rear of the

machine. Mixing auger 1 [D] returns the excess developer, along with new toner, to the front of the mixing

assembly. Here the developer is reapplied to the development roller.

The TD sensor [A] detects the toner density in the development unit.

Development Bias

Development bias is generated by a power pack and is applied to the development sleeve [A] via the development

sleeve drive shaft and bias terminal [B].

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