Oki C610 - Manual (Page 105)

105 – C610/C711 User’s Guide
3. Gently wipe the LED head surface with a clean, lint free cloth.
4. Close the top cover and press down firmly at both sides so
that the cover latches closed.
CAUTION!
Do not use methyl alcohol or other solvents on the LED
head as damage to the lens surface will occur.