Oki MC770 Maintenance Manual

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.

Oki MC770 Specifications

General

Brand	Oki
Model	MC770
Category	All in One Printer
Language	English