Oki LD670 User Manual page 185

(4) Press the FEED switch briefly (one second or less) once to move to
"CUTTER CLEANING."
Then, press the FEED switch for one second or longer to accept the
selection. The printer enters cutter cleaning mode. The printer prints the
following and cuts the paper when it enters cutter cleaning mode:
(5) After completing cleaning, reposition the roll paper, and close the top
cover.
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