45584901TH Rev.1
4-7 /
Oki Data CONFIDENTIAL
4.3 Image Quality Adjustment (Printing Function)
4.3.1
Automatic gamma adjustment
When the reproduction of gradation is not appropriate, the gradation reproducibility of all colors
Y, M, C and K can be corrected by performing this automatic gamma adjustment. In case
the gradation reproduction of the image checked is not satisfactory, make this adjustment as
described below at parts replacement.
When unpacking or any of the following parts has been replaced, be sure to make this adjustment:
• Drum unit
• Transfer belt unit
• SRAM board (CU board)
• PU board
• HDD
Notes:
Be sure to perform this adjustment after performing
P. 4-2 “4.1.2 Performing density
correction”.
<Procedure>
(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 “Patch
chart for adjustment”.
600dpi
Pattern No.
Paper type
Remarks
70
Plain paper
Used when the code 8004-0 is performed
74
Thick paper 5
Used when the code 8004-2 is performed
76
Thick paper 1
Used when the code 8004-3 is performed
78
Thick paper 2
Used when the code 8004-4 is performed
80
Thick paper 3
Used when the code 8004-5 is performed
82
Thick paper 4
Used when the code 8004-6 is performed
86
Special paper 4 to 6
Used when the code 8004-8 is performed
88
User type
Used when the code 8004-9 is performed
90
Plain (Thin)
Used when the code 8004-10 is performed
Notes:
However, this is applied to all paper types when 05-8008 is performed.
1200dpi
Pattern No.
Paper type
Remarks
230
Plain paper
Used when the code 8005-0 is performed
234
Thick paper 5
Used when the code 8005-2 is performed
236
Thick paper 1
Used when the code 8005-3 is performed
238
Thick paper 2
Used when the code 8005-4 is performed
240
Thick paper 3
Used when the code 8005-5 is performed
242
Thick paper 4
Used when the code 8005-6 is performed
246
Special paper 4 to 6
Used when the code 8005-8 is performed
248
User type
Used when the code 8005-9 is performed
250
Plain (Thin)
Used when the code 8005-10 is performed
Notes:
However, this is applied to all paper types when 05-8009 is performed.