Oce CS2436 User Manual page 648

Maintenance (CS2436-10)
Important
Do not use a dry cloth to wipe inside the Top Cover. This may create
a static charge, which may attract dust and affect the printing quality.
Never use flammable solvents such as alcohol, benzene, or thinner. If
these substances come into contact with electrical components inside
the printer, there is a risk of fire or electrical shock.
Do not touch the Linear Scale (a) or Carriage Shaft (b).