PCDU
550
Toner and developer are regulated by the doctor blade, and applied to the development roller.
• Toner Density Detection Mechanism
Toner density sensor [C] detects the toner density. Toner is supplied when the toner density is not
sufficient.
• Toner Density Control
The ID sensor at the lower right of the ITB detects the amount of light reflected from the drum and detects
the toner density. Toner is supplied based on the information which the ID sensor detects.
Drum/Development Drive
Callout Item Callout Item
[A] Drum Gear (K) [G] Drum Drive Gear (Y)
[B] Development Drive Gear (K) [H] Development Drive Gear (Y)
[C] Drum Drive Gear (C) [I] Development Motor (CMY)
[D] Development Drive Gear (C) [J] Drum Motor (CMY)
[E] Drum Drive Gear (M) [K] Drum Motor (K)
[F] Development Drive Gear (M) [L] Development Clutch (K)
The Drum motor (Bk) [K] drives the drum (K). The Development Clutch [L] drives the Development Unit for
K.
The Drum motor (CMY) [J] drives the other three drums and the development motor (CMY) [I] drives the
Development Units for C/M/Y.
Do not disassemble the three drive gears ([C], [E], and [G]) in the field. These are precisely assembled in the
factory.
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