Oki LD670 User Manual page 183

The cleaning procedure is as follows.
(1) With paper inserted in the printer, turn off the printer power switch
once, and turn on the switch again while holding down the FEED
switch on the control panel. Then, the data shown below is printed.
Note: If you have passed the item that you want to select, repeatedly press the
FEED switch briefly until you return to the first item.
Test Print
End
Sample Print
Data Analysis
Cleaning
Sensor Adjustment
Setup
Test Print
Selection Item
Special Mode
Usage
Item Selection
Please push the feed switch short.
Item Decision
Please push the feed switch long.
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