Operation - Canon NP6330 Service Manual

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2. Operation

During initial rotation (INTR), the scanner is moved forward by about 70 mm / 2.8",

and the scanning lamp (LA1) is tuned on at a specific intensity to illuminate the original.

Then, the density of the original is read by the AE sensor, and its output is sent to the

DC controller.

Based on the output of the AE sensor, the DC controller controls the DC component

of the developing bias.

Figure 4-114 shows a graph showing the changes in the developing bias occurring

in relation to various original densities.

The graph is based on a degree of exposure which provides optimum density without

fogging when a newspaper and the Test Sheet is copied.

During AE control, the copy density varies between F5 and F7.5, possibly

preventing an appropriate copy density if the original is considerably dark or light.

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Developing DC bias

Copy density 7.5

Copy density 5

Figure 4-114

CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 4 IMAGE FORMATION SYSTEM

Original density

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