Sharp SF-1020 Transition of photoconductor surface potential, Process control function, Summary

(4) Transition of photoconductor surface potential

Charge	Exposure	BL	Develop	Transfer	Separate	Clean	D L
-730V
		Dark area
-215V			Developing bias voltage
		Light area
				Residual potential

(5) Photoconductor drum sensitivity correction

In this model, fall in sensitivity due to long use of the photoconductor drum is corrected by the copy lamp light intensity to prevent against considerable change in copy quality.

The photoconductor drum sensitivity fall correction is performed as follows:

(NEW) (USED)

Cleaner	CTL
Develop	CGL
OPC drum

CTL

CGL

CLV

1step = 0.33

Sim46

(Sim46)

0

Time (min)

(6) Process control function

[Summary]

The process control function detects the density of the standard toner image formed on the photoconductor, the density of the initial image and controls the charging grid voltage so that the same level as the initial image density is provided.

That is, the process conditions are established and the high voltage output and exposure level are controlled to stabilize the toner density. In this model, the density sensing level is automatically set.

F

Mark

R

MAin control PWB

CPU density
judgement
I/O MC grid	High voltage PWB
output selection	MC grid bias
	output (density
	correction)
	in each mode
	(Light quantity
	correction)

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