Toshiba e-STUDIO355 - Image Quality Adjustment (Copying Function)

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ADJUSTMENT

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3.4 Image Quality Adjustment (Copying Function)

3.4.1 Automatic gamma adjustment

When the reproduction of gradation is not appropriate, it can be corrected by performing this automatic

gamma adjustment. At the parts replacement and in case the gradation reproduction of the image is not

satisfactory, make this adjustment as described below.

(1) When unpacking or any of the following parts has been replaced, be sure to make this

adjustment:

• Photoconductive drum • Developer material • Laser optical unit

• Transfer roller • Drum cleaning blade

• Main charger grid • SRAM board

(2) Be sure to perform this adjustment when changing the system ROM.

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

(2) Select the A4/LT drawer. Key in “10” and press the [FAX] button to print 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 black side of the gradation pattern against the original scale.

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

(5) When the adjustment has finished normally, “ENTER” is shown. Press the [ENTER] 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.

Code Item to be adjusted Contents

580 Automatic gamma

adjustment

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

performing this automatic gamma adjustment.

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