Functions - Toshiba e-STUDIO 2555C Service Manual

3.13.3

Functions

1. Developer material
The developer material consists of the carrier and toner. Since the developer material deteriorates
after a long time use, periodic replacements are needed.
2. Mixer
The carrier and toner are frictionized each other when the developer material is stirred. Then the
carrier is positively charged (+) and the toner is negatively charged (–), and the toner is adhered by
the electrostatic force.
3. Developer sleeve (Magnetic roller)
These aluminum rollers have magnets inside. The developer material is pulled by these magnets to
form a magnetic brush. The magnets are fixed at their position so only the sleeve rotates. By this
rotation, the developer material is transported to the developer sleeve.
Then the magnetic brush formed at the developer sleeve sweeps over the drum surface and thus
development is performed.
4. Doctor blade
The doctor blade controls the amount of the developer material from the developer sleeve so that
the magnetic brush of the developer material can contact with the drum surface properly.
5. Auto-toner sensor (S1, S2, S3, S4)
To print out a precise image, the proportion (toner density ratio) of the carrier and the toner in the
developer material needs to be always constant. The magnetic bridge circuit in the black auto-toner
sensor detects the toner ratio in the developer material. This sensor supplies the toner from the
toner cartridge.
6. Paper feeding/developer unit drive motor (M2)
This motor rotates the Y, M, C, K developer units. The drive of the motor is transmitted to each
developer unit by gears in the following 2 lines: Developer motor → K developer unit, developer
motor → C developer unit → M developer unit → Y developer unit
7. Toner motor (M8, M9, M10, M11)
These motors drive the paddles and auger in the toner cartridge and transport the toner filled in the
cartridge to the developer unit. Each toner cartridge of Y, M, C and K mounts one toner motor
correspondingly.
8. Waste toner paddle motor (M7)
This motor rotates the paddles mounted in the Waste toner box to level the Waste toner
accumulated in the waste toner box.
9. Waste toner box
This collects the residual toner scraped off on the drum surface by the cleaning blade and residual
toner scraped off on the transfer belt by the transfer belt cleaning blade.
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