Olivetti D-COPIA 300MF Operation Manual page 64

Preparation before Use
2-26
Original size indicator plates
(Inch models)
(Metric models)
3 Close the original cover.
CAUTION:
Do not push the original cover forcefully when you close it.
Excessive pressure may crack the platen glass.
NOTE:
Shadows may be produced around the edges and in the middle
of open-faced originals.
CAUTION:
Do not leave the document processor open as there is a
danger of personal injury.
OPERATION GUIDE