Oki PH640 User Manual page 42

(6) Turn the printer power OFF, and restore the DIP switches DIPSW1-4, DIPSW1-5, DIPSW1-6,
DIPSW1-7, and DIPSW1-8 to their original settings.
6-5-4. COF Sensor Adjustment Mode
(1) Make sure the printer power is turned OFF.
(2) Insert a slip paper to set the printer in the "paper present" state.
To do so, open the front cover as shown below and insert the paper diagonally from the
left.
Set the paper straight while pressing on the platen. Then, close the front cover.
(3) Undo the screws and remove the DIP switch cover from the bottom of the printer.
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