Toshiba e-STUDIO 5540C Service Manual page 133

16.Developer material
The developer material consists of the carrier and toner. Normally developer material does not need
to be replaced periodically. However, replacement may be needed depending on the use condition.
17.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.
18.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 that 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.
19.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.
20.Auto-toner sensor (S26, S27, S28, S29)
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. Toner is supplied from the sub-hopper when
the toner contained in the developer material is running out.
21.Toner motor (M15, M16, M17, M18)
These motors drive the paddles and auger in the toner cartridge and transport the toner filled in the
cartridge to the sub-hopper. Each toner cartridge of Y, M, C and K mounts one toner motor
correspondingly.
22.Sub-hopper toner motor (M19, M20, M21, M22)
This motor transports toner in the sub-hopper to the developer unit. One motor is installed for each
developer unit of YMCK colors.
23.Waste toner transport motor (M33)
The waste toner transport motor rotates the auger in the corresponding unit and transports the
waste toner which exits from each YMCK developer unit and the transfer belt cleaner unit, as well as
the waste developer material which exits from each YMCK developer unit.
24.Auger lock detection sensor (S42)
This sensor detects locking of the waste toner transport auger. When the waste toner transport
auger is locked due to the overload or malfunction of the motor, this sensor detects it and the service
call (CD71) occurs.
25.Waste toner amount detection sensor (S13)
The waste toner amount detection sensor is a transmissive sensor whose purpose is to detect the
amount of waste toner in the waste toner box.
This sensor detects when the amount of waste toner has reached approx. 80% of the toner full.
26.Waste toner box full detection sensor (S14)
The waste toner box full detection sensor is a transmissive sensor whose purpose is to check the
sensor section at the side of the waste toner box. When the Waste toner box becomes full of waste
toner and the accumulated waste toner shields the sensor path, this sensor detects that the waste
toner box is full.
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