Oki B 4100 Maintenance Manual page 354

3 Austria (40044103)
This section gives the following instruction.
• DIP switch setting
• Instructions of marking with red oil ink.
For detail, see the figure below.
ON
1 2 3 4
Magnified figure
D A C H
X 1 X 2
Marking a portion "A" with red oil ink.
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40055101TH Rev.4