Dell 3010CN Service Manual page 544

When the number of prints increases, the consumption of toner in the Developer Assy also
increases. In order to maintain an appropriate developer concentration, it is necessary to refill
with an amount of toner equivalent to that consumed from Toner Cartridge to Developer Assy.
This refilling process is called "Toner dispense".
Toner dispense is performed using a combination of 2 kinds of control ("PCDC" and "ADC").
In order to obtain a full color image using 4 toner colors, it is necessary to form a toner image
for each Y, M, C and K on the drum sequentially.
In the case of this device, 4 Developer Assy are set around the circumference at 90 degrees
intervals, so that when Rotary Frame Assy is rotated, Developer Assy for each of the colors
face each other and the toner image of each color is formed. This method is called "Rotary
developing method".
Toner Cartridge M
Developer Assy C
The carrier looses its charge characteristics by contamination on the surface due to toner or
scratches made by agitation. In order to maintain the charge characteristics, a small amount
of carrier is mixed with toner inside the Toner Cartridge and toner and carrier are supplied to
toner dispense, while deteriorated carrier in Developer Assy is collected in a separate chamber
in Toner Cartridge. This is called "Trickle development method". Trickle development is
performed using rotation of Rotary Frame Assy at rotary developing.
Mechanism of Trickle developing is shown below.
1 Pipe is inserted in the Developer Assy.
2 Small amount of carrier enters the pipe.
3 Carrier is scooped up and moved to the back of the pipe.
4 Carrier is collected inside Toner Cartridge.
Rotary Frame Assy
Developer Assy M
Toner Cartridge C
Rotary Frame Assy
L shaped pipe
Drum
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Toner Cartridge Y
Developer Assy Y
Drum
Toner Cartridge BK
Developer Assy BK
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Chapter 6 Principle s of O peration
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Toner Cartridge
Separate chamber
for collecting carrier
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