Gamma Balance Adjustment - Oki MB760 Service Manual

4.2.3

Gamma balance adjustment

The density adjustment at the Black Mode is performed by selecting its density area from the
following: low density, medium density and high density.
<Adjustment Mode (05)>
Color
Text/
mode
Photo
Black 7190-0 7191-0 7192-0 7276-0 Low density
7190-1 7191-1 7192-1 7276-1 Medium density
7190-2 7191-2 7192-2 7276-2 High density
Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure.
Notes:
Be sure that this adjustment is made after performing  P. 4-4 "4.2.1 Automatic gamma
adjustment".
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the code of the mode to be adjusted (original mode) and press the [START] button.
(3) Select the density area to be adjusted with digital keys (0, 1 or 2), and press the [START]
button.
0: Low density
1: Medium density
2: High density
(4) Key in an 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) Press the [FAX] button and then press the [START] button to make a test copy.
If the original mode is Custom, restart the equipment and check if the desired image quality
is attained.
(8) If the desired image quality has not been attained, repeat step (2) to (7).
If the original mode is Custom, repeat step (1) to (7).
45641001TH Rev.1
Original mode
Custom
Text Photo
Mode
Item to be adjusted
The larger the value is, the
density of the item to be
adjusted becomes darker.
Acceptable values:
0 to 255 (Default: 128)
Oki Data CONFIDENTIAL
Remarks
4-6 /