Sharp SF-1116 Manual de Serviço descarregar pdf (Página 37)

4) Transition of photoconductor surface 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:

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.

Charge Exposure

Develop

Transfer Separate

Clean

Dark area

Developing bias voltage

Light area

Residual potential

-730V

-215V

Cleaner

OPC drum

Develop

(NEW)

CTL

CGL

(USED)

CTL

CGL

Change the tickness of the carrier transport layer (CTL).

By the developper.

By the cleaner blade.

Sim46

CLV

Time

MAin control PWB

High voltage PWB

(Light quantity

correction)

CPU density

judgement

I/O MC grid

output selection

MC grid bias

output (density

correction)

in each mode

5 – 14

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 124 125

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Sharp SF-1116 Manual de Serviço Página 37

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