Belt Position Control - Dell 3010CN Service Manual

(5) Adjustment during printing job
When printing job is performed, toner in Developer Assy is consumed. Toner shall be supplied
to Developer Assy even during printing in order to obtain stable image quality. The following
procedure shall be taken to supply an adequate amount of toner.
PCDC (Pixel Count Dispense Control)
Estimate toner amount to be consumed according to count value of image data input by
controller, and control the amount of toner to be supplied to Developer Assy. Supply
amount is controlled according to Toner Dispense time.
Magnet Roll Dispense
Motor Clutch
(6) Adjustment after printing finishes
In the case that printing of a total of more than 20 sheets is carried out, after printing is
complete, adjustment from (1) to (4) shall be performed for image quality.

7.4 Belt position control

In full color printing, toners of 4 colors are overlapped, therefore it is necessary to control belt
position so that toners of the 4 colors can be transferred at the correct position. Sensor TR0 is an
optic reflecting type sensor. There is a silver seal on the Belt used to detect position. Whenever the
Belt goes one cycle, output level of Sensor changes at the silver seal position. Belt position is
controlled using this change.
Toner Cartridge
Auger
Developer Assy
Laser beam
ROS ASSY
Drum
Video signal count
toner consumption
6 - 38
Chapter 6 Principle s of O peration
(Printer controller)
(MCU PWB)
Video signal
Calculation of
Calculation of
dispense time
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