Ricoh FT7770 Service Manual page 81

The developer is agitated and mixed by the paddle roller and the crossmixing
mechanism. Also, the developer agitator, just under the toner inlet, mixes
fresh toner added by the toner supply roller with the developer spilling from
the flow plate.
rubbing action between toner and developer particles.
The development cooling fan provides a constant flow of cool air around
development unit to prevent loss of image density.
The developer catch pan is used when removing worn developer from
development unit.
The negative triboelectric charge of toner results from
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30 April, '89
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