Mamiya PRO 645 - Manual (Page 43)

When the camera is not used for a long period of time,
remove the battery and any film from the camera.
Avoid storing the camera for prolonged periods of time
in a damp or salty atmosphere. (Color film should be
stored at the manufacturer’s recommended tempera-
tures.)
Since cameras are precision instruments, avoid shocks
and rough handling.
When camera and lens are stored for a long time,
periodically exercise the shutter(s) at various speeds
and also turn the lens diaphragms.
Cleaning
Never touch the surface coated mirror. Clean dust
particles with a blower and optical surfaces with lens
cleaning tissue and lens cleaner.
Periodic Check
Periodically check the camera to make sure that it is in
good working order, especially before an important
assignment. Check the battery, flash synchronization,
mirror and shutter movement, film advance, diaphragm
operation, etc.
Should any malfunction occur or if the camera has
been dropped, jarred or become wet, do not attempt to
fix it yourself but send it to the Service Department of
your Mamiya distributor.
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