Image Quality Adjustment (Printing Function) - Oki MB760 Service Manual

4.3

Image Quality Adjustment (Printing Function)

4.3.1 Gamma balance adjustment (Black Mode)
The gamma balance is adjusted by adjusting the density at the Black Mode. The adjustment is
performed by selecting its density area from the following: low density, medium density, and high
density.
When "Black" (600 dpi) is set for the color mode and "Auto" is selected for the halftone setting,
the gamma balance can be adjusted in each area of Text, Graphics and Image.
<Adjustment Mode (05)>
Smooth Detail Smooth Detail Smooth Detail
Color
mode
(PS)
Black 7315-0 7316-0 7317-0 7318-0 7319-0 7320-0 The larger the value is, the
(600dpi)
7315-1 7316-1 7317-1 7318-1 7319-1 7320-1
7315-2 7316-2 7317-2 7318-2 7319-2 7320-2
Black 7309-0 7310-0
(1200dpi)
7309-1 7310-1
7309-2 7310-2
Color
mode
Text
Black 7360-0 7361-0 7362-0 7366-0 7367-0 7368-0 The larger the value is, the
(600dpi)
7360-1 7361-1 7362-1 7366-1 7367-1 7368-1
7360-2 7361-2 7362-2 7366-2 7367-2 7368-2
Notes:
• Be sure that this adjustment is made after performing  P. 4-4 "4.2.1 Automatic gamma
adjustment".
• Changing the adjustment setting influences the adjacent density area slightly.
E.g.: When the value of the medium density is larger, the adjacent areas in the low density
and high density range will become slightly darker.
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes to be adjusted (language and screen) and press the [START] button.
(3) Key in the value corresponding to the density area to be adjusted (0, 1 or 2) and press the
[START] button.
0: Low density 1: Medium density 2: High density/Highest density
(4) Key in the adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value in memory. → The equipment
goes back to the ready state.
(6) For resetting the value, repeat step (2) to (5).
(7) Let the equipment restart and perform the printing job.
(8) If the image density has not been attained, repeat step (1) to (7)
45641001TH Rev.1
(PS) (PCL) (PCL)
− −
− −
− −
Auto (PS)
Graphics Image Text
(XPS) (XPS)
density of the item to be
adjusted becomes darker.
Acceptable values: 0 to 255
(Default: 128)
− − The larger the value is, the
density of the item to be
− −
adjusted becomes darker.
− −
Acceptable values: 0 to 255
(Default: 128)
Auto (XPS)
Graphics Image
density of the item to be
adjusted becomes darker.
Acceptable values: 0 to 255
(Default: 128)
Oki Data CONFIDENTIAL
Remarks
Remarks
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