Toshiba e-Studio477s - Image Quality Adjustment (Copying Function); Automatic Gamma Adjustment

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SETTING / ADJUSTMENT

4 - 4

4.2 Image Quality Adjustment (Copying Function)

4.2.1 Automatic gamma adjustment

When the reproduction of gradation is not appropriate, the gradation reproducibility can be corrected by

performing this automatic gamma adjustment. In case the gradation reproduction of the image checked

is not satisfactory, make this adjustment as described below at parts replacement.

When unpacking or any of the following parts has been replaced, be sure to make this adjustment:

• Drum unit

• Transfer belt unit

• SRAM board (SYS board)

• PU board

•HDD

Notes:

Be sure that this adjustment be made after performing the image adjustment in  P. 4-2 "4.1.2

Image Dimensional Adjustment".

(1) While pressing [0] and [5] simultaneously, turn the power ON.  Adjustment Mode

(2) Select the A4/LT drawer. Key in the pattern number and press the [FAX] button to output a “Patch

chart for gamma adjustment”.

(3) Place the patch chart for adjustment printed in step (2) face down on the original glass.

Place the chart aligning its side with a black square against the original scale.

(4) Key in a code and press the [START] button.

 The scanner reads the chart automatically and performs automatic gamma adjustment

calculation (approx.30 sec.).

(5) When the adjustment has finished normally, press the [OK] button to have the adjustment results

reflected.

(To cancel the reflection of adjustment results, press the [CANCEL] button.)

In the case of an abnormal ending, “ADJUSTMENT ERROR” is shown.

Press the [CANCEL] button to clear the error display. When it is cleared, the control panel display

will return to the ready state. Then, check if the patch chart on the original glass is placed in the

wrong direction or if it is placed inclined on the original glass, and then repeat step (3) and

afterward.

Pattern No. Pattern No. Remark Paper type

10 Black When performing code 05-7165 All paper types

Code Item to be adjusted Contents

7165 Automatic gamma

adjustment

When the reproduction of gradation is not appropriate, the gradation

reproducibility can be corrected by performing this automatic gamma

adjustment. The result of 7165 is applied to all paper types.

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