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45584901TH Rev.1 4-5 /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 of all colorsY, M, C and K can be corrected by performing this automatic gamma adjustment. In casethe gradation reproduction of the image checked is not satisfactory, make this adjustment asdescribed below at parts replacement.When unpacking or any of the following parts has been replaced, be sure to make thisadjustment:• Drum unit• Transfer belt unit• SRAM board (CU board)• PU board• HDDNotes:Be sure that this adjustment be made after performing the image adjustment in P. 4-2 “4.1.2Performing density correction” and P. 4-3 “4.1.3 Image Dimensional Adjustment”.(1) While pressing [0] and [5] simultaneously, turn the power ON. → Adjustment Mode(2) Select the A4/LT Tray. Key in the pattern number and press the [FAX] button to output a “Patchchart for gamma adjustment”.Pattern No. Pattern No. Remark Paper type4 Color/black integrated When performing code 05-7869 All paper types200 Color/black integrated When performing code 05-7871-0 Plain paper204 Color/black integrated When performing code 05-7871-2 Thick paper 5206 Color/black integrated When performing code 05-7871-3 Thick paper 1208 Color/black integrated When performing code 05-7871-4 Thick paper 2210 Color/black integrated When performing code 05-7871-5 Thick paper 3212 Color/black integrated When performing code 05-7871-6 Thick paper 4216 Color/black integrated When performing code 05-7871-8 Special paper 4 to 6218 Color/black integrated When performing code 05-7871-9 User type220 Color/black integrated When performing code 05-7871-10 Plain (Thin)(3) Place the patch chart for adjustment printed in step (2) face down on the original glass.Place the chart aligning its side with 2 black squares 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.).Code Item to be adjusted Contents7869(7871)Automatic gammaadjustmentWhen the reproduction of gradation is not appropriate, thegradation reproducibility of all colors Y, M, C and K can becorrected by performing this automatic gamma adjustment. Theresult of 7869 is applied to all paper types. The result of 7871 isapplied to the specified paper type.
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