Toshiba e-STUDIO2500c, Руководство по обслуживанию, Страница: 259 / 402

12
May 2006 © TOSHIBA TEC e-STUDIO2500c/3500c/3510c DEVELOPER UNIT
12 - 3
12.3 Functions
1) Developer material
The developer material consists of the carrier and toner. The carrier is made of electrically conduc-
tive ferrites which is 30-100 µm and the toner is made of the resin particle which is approx. 6.8 µm.
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 (S22, 23, 24, 25)
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) EPU board (EPU-Y, -M, -C, -K)
The data whether the EPU is unused or not is written on the EPU board.
7) Developer unit motor (M9)
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
The one-way clutch is installed in the gear which links the drive. When the motor rotates normally, all
the Y, M, C, K developer units rotate, when the motor rotates reversely, only the K developer unit
rotates.
8) Toner motor (M2/M3/M4/M5)
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 corre-
spondingly.
9) Used toner motor (M6)
This motor rotates the paddles mounted in the toner bag to level the used toner accumulated in the
bag. When the used toner motor (M6) is locked due to the full status of the toner bag, the used toner
motor lock detection sensor (S14) detects that the toner bag is full.