Oki C9000 Series User Manual page 108

2. With an LED lens cleaner or soft cloth, gently wipe each of
the four heads (1). Move the cleaner as shown, using a
clean section of the cleaner with each pass. Be careful not
to damage the guards (2).
3. Close the printer unit top cover then lower the scanner
unit.
C9800 MFP User's Guide> 108