Ricoh B246 SERIES, Manual, Page: 175 / 268

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175
Overview - Development Unit
„
One development
roller
„
Toner density
control
z
TD and ID
sensors
z
Image pixel
count
TD Sensor
Service manual, section 6.9.1
ˆ
Outline the development mechanism for this machine. Point out the following:
ˆ
A single-roller development system is used.
¾
In the SP5 and Mojito, a double-roller system was introduced to solve certain
copy quality problems. However, in the Martini, a finer toner and developer is
used, and the technology of the copy process has been improved sufficiently
to allow the return of the single-roller system.
¾
This extremely fine toner and developer has improved image quality,
especially for thin horizontal lines, the trailing edges of half-tone areas, and
hollowing out near the points where black lines cross.
ˆ
The toner density sensor is below the development unit. It measures toner
concentration in the developer, and is one of the main components used for toner
supply control (the other is the ID sensor).
ˆ
The toner and carrier are both finer than in the Mojito.