Image Quality Adjustment (Copying Function) - Toshiba e-STUDIO556 Service Manual

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Image Quality Adjustment (Copying Function)

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.

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

Photoconductive drum

Transfer roller

Main charger grid

Be sure to perform this adjustment when clear the HDD data.

While pressing [0] and [5] simultaneously, turn the power ON.

Select the A4/LT drawer. Key in "10" and press the [FAX] button to print a "Patch chart for gamma

adjustment".

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.

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

When the adjustment has finished normally, "OK" is shown. 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

e-STUDIO556/656/756/856(Ver03)

Developer material

Drum cleaning blade

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

performing this automatic gamma adjustment.

Laser optical unit

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