Just purchased a Mamiya 645 pro body with a back and I'm trying to make sure it works. Currently, I can not get the shutter to fire and I have checked: battery shutter lock dark slide correct shutter speed My question is, do i need a view finder on the camera to operate the shutter? Is this the problem?

SOURCE: Mamiya RZ67 Camera Older model.

Problem solved- The camera does not operate correctly unless the battery is in good condition, in place, and all the contacts are clean. In the RZ76 as opposed to the old RB models the components "talk" to each other: via electronic circuits. The back "tells" the camera bod if the dark slide ins in or out and whether the film is loaded or at the end of the roll. If the batter voltage is too low or the contacts are no clean and making full contact the body has no way of knowing the condition of the film backs and the interlocking mechanisms fail to work.

What I did was firstly test the battery under load and discovered that the cell was a bit low. It was a fresh battery but it is a good idea to turn the camera off after shooting in case the is a slight current draw when the camera is idle (?) . I replaced the battery and traced the voltages through the body to see if it was getting to some of the contacts such as the onces on the meter prism which has LEDs to be lighted. I also used an ohm meter to check out continuity- everything seemed to be in order. I then cleaned all the contacts including the battery terminals withl alcohol and made sure everything was dry and clean.

Now- everything works. The camera was turned off overnight and the battery has lost no voltage when tested under load..

This camera is equipped with RB lenses which have no electrical contacts and therefore the camera and lenses can't "communicate" so the meter will not work with theses older lenses.

Ed

FIKRET UNALIR

• 239 Answers
• Posted on Mar 24, 2010

SOURCE: I just got a Mamiya 645 Pro off ebay, but the

Test these instructions above, I hope it will work

SOURCE: Mamiya 645 pro shutter doesn't fire

First thing that comes to mind on this camera is that it's a modular camera. This means the film back can be changed mid roll so there is what is called a Dark Slide between the film back and the body.

The dark slide needs to be removed before the camera will function. Also depending on how "new" the film back is there may be a dark slide holder/sleeve on the back side of the film back.

So you remove the dark slide and slide is into the holder so first you don't loose it and also it doesn't get bent.

Diagram

SOURCE: I have a Mamiya 645

Hi karlsenpaata,

I would suggest you to shoot some photos reset the settings and then remove the battery of the camera for at least half an hour , then put the battery back again and then the problem would be resolved.
Hope this helps ..:)