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45641001TH Rev.1 4-4 /Oki Data CONFIDENTIAL4.2 Image Quality Adjustment (Copying Function)4.2.1 Automatic gamma adjustmentWhen the reproduction of gradation is not appropriate, the gradation reproducibility can becorrected by performing this automatic gamma adjustment. In case the gradation reproductionof the image checked is not satisfactory, make this adjustment as described below at partsreplacement.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• HDDNotes:Be sure that this adjustment be made after performing the image adjustment in P. 4-2 “4.1.2Image 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“Patchchart for gamma adjustment”. Mode (05)>Pattern No. Pattern No. Remark Paper type10 Black When performing code 05-7165 All paper types(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 adjustmentcalculation (approx.30 sec.). Mode (05)>Code Item to be adjusted Contents7165 Automatic gammaadjustmentWhen the reproduction of gradation is not appropriate, thegradation reproducibility can be corrected by performingthis automatic gamma adjustment. The result of 7165 isapplied to all paper types.(5) When the adjustment has finished normally, press the [OK] button to have the adjustmentresults 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 paneldisplay will return to the ready state. Then, check if the patch chart on the original glass isplaced in the wrong direction or if it is placed inclined on the original glass, and then repeatstep (3) and afterward.
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