Olivetti d-Copia 300MF Guide De L'utilisateur page 146

Maintenance
5-6
4 As shown in the figure, clean
dirt from the transfer roller by
moving the brush from side to
side along the roller while
rotating the roller by turning
the gear at the left end of the
roller.
5
Put away the cleaning brush,
press the specified position of
the front cover and left cover 1
to close.
OPERATION GUIDE