Image Quality Adjustment (Copying Function) - Toshiba e-STUDIO205L Service Handbook

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
• Transfer roller
• Main charger grid
(2) Be sure to perform this adjustment when changing the system ROM.
Code Item to be adjusted
580 Automatic gamma
adjustment
<Procedure>
(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.
e-STUDIO205L/255/305/355/455
ADJUSTMENT
• Developer material
• Drum cleaning blade
• SRAM board
When the reproduction of gradation is not appropriate, it can be corrected by
performing this automatic gamma adjustment.
3 - 22
• Laser optical unit
<Adjustment Mode (05)>
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