Savin SDC103A Service Manual download pdf (Page 127)

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4.5.6 Gamma Correction (Printer Gamma)

(1) BKCMY Gamma

Ideally, the gamma curves for Yellow, Magenta, Cyan, and Black should be

identical, as shown in figure 1. However, they are not, because electrical

components always vary slightly, resulting in varying gamma curves, as

shown in figure 2.

To compensate for this discrepancy, the Auto Color Calibration (ACC)

procedure can be done if color reproduction is becoming unsatisfactory.

ACC creates new gamma curves for each color in each mode (letter, photo,

Bk letter, glossy photo). After ACC, the gamma curve for each color mode

can be adjusted with service programs (see Replacement and Adjustment,

section 6-4, Image Processing)

Using these programs, each gamma curve can be adjusted using 4 different

modes: ID max., High ID, Middle ID, and Low ID, as shown on the following

page. If the previous gamma curve was better, it can be recalled. Also, the

factory settings can be loaded using SP 5-610-4.

Fig. 1

Fig. 2

IMAGE PROCESSING

A166/A187/A189 2-58 SM

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 127

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