Oki ES9160 Maintenance Manual page 777

[I] Adjust image quality
(1) Start up with the Adjustment mode (05).
(2) Perform "Automatic gamma adjustment" <PPC> (05-7165).
P. 6-22 "6.4.1 Automatic gamma adjustment"
(3) Turn the power OFF.
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ES9160 MFP / ES9170 MFP
REPLACEMANT OF HDD/PC BOARDS
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