Reference Manual

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The P+ back is fully integrated with the camera body and acts
as a part of the whole camera system. When no cassette is
attached to the Mamiya 645 AFD camera house the mirror is up
and the shutter is open. This is the correct position when no film
cassette is attached. When attaching the P+ back to the camera
body the shutter will close and the mirror comes down. It is
important to ensure that the bottom part of the P+ back camera
back is pressed well into the locking mechanism before the
upper locking mechanism is pressed together. Failure to do this
can cause an error with the Mamiya body. The error is a state
of continuously opening and closing the shutter. If this occurs,
remove the P+ back. Please be aware that the shutter should
be in the correct starting position (shutter open), if this is not the
case, attach and remove the P+ back again to make sure that
the camera body gets in the correct starting position. (The same
procedure is recommended by Mamiya for all film cassettes)
Press and hold down the "Detach" button
while connecting the upper part
Place the P+ back firmly in the bottom
locking mechanism
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