Oki LD670 User Manual page 154

The printer prints the following when entering special mode:
Test Print
End
Sample Print
Data Analysis
Cleaning
Sensor Adjustment
Setup
Test Print
Special Mode
Usage
Item Selection
Item Decision
1) Quickly press the FEED switch twice (up to one second each). When
<<SENSOR ADJUSTMENT>> is printed, press and hold down the
FEED switch for at least one second to start sensor adjustment.
Selection Item
Please push the feed switch short.
Please push the feed switch long.
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