Here's one idea
Have you been using the lens with the additional screw thread for the second
cable release used for mirror up operation?
Sometime this thread remains protruding out from the lens barrel even AFTER
removing the cable release, and so the lens won't fire via the usual shutter
release button.
Reconnect the mirror up cable release, and then undo it again: A gentle push
as you do this ensures the protruding bit goes back flush with the lens
barrel.

> Hello list , I know there are some Mamiya RZ users on list .
>
> We had a problem this morning , the camera would just not fire , all we
> got was the  warning sound (beeping).
> Took the camera apart , suspecting that the AE prism contacts were at
> fault , changed all batteries , all to no avail.
> Tried a different lens , and bingo it worked .
> So , anyone had similar problems ? or any ideas on how to fix the
> faulty 50mm lens ? I suspect its an electronics problem.
>
> sorry for OT nature , but we need to use lens tomorrow .
>
> Many thanks
>
> Janus
>
>
>
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