e-STUDIO556/656/756/856(Ver03) © 2012 TOSHIBA TEC CORPORATION All rights reserved
ADJUSTMENT
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6.4 Image Quality Adjustment (Copying Function)
6.4.1 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.
(2) Be sure to perform this adjustment when clear the HDD data.
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(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, “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
afterward.
Photoconductive drum Developer material Laser optical unit
Transfer roller Drum cleaning blade
Main charger grid SRAM board
Code
Item to be
adjusted
Contents
05-7165 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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