Mamiya 645 Pro TL back won't work...

Hi Everyone -

One of the backs for my Mamiya 645 Pro TL just stopped working the other day. When you load the film, it advances to the first frame (with the power grip) but when you press the button to take the first shot it does nothing. It's not the camera because it fires with the back off and it fires with my other back.

Has anyone ever experienced this?

Thanks - Steve

Try cleaning the electrical contacts on the back.

I forgot to mention that I did try that. Did not work.

I once had a back that refused to communicate the film speed to the camera. It took several vigorous contact-cleaning attempts before it came right.

Another possibility is that the darkslide or its detector switch is faulty. Try swapping darkslides between backs.

Never had a moment's problem with my old metal M645s BTW. In fact they're still working. Whereas all my plastic 645s gave endless trouble. It seems they were in for repair more than they were in use!

I once had a back that refused to communicate the film speed to the camera. It took several vigorous contact-cleaning attempts before it came right.

 

Another possibility is that the darkslide or its detector switch is faulty. Try swapping darkslides between backs.

 

Never had a moment's problem with my old metal M645s BTW. In fact they're still working. Whereas all my plastic 645s gave endless trouble. It seems they were in for repair more than they were in use!

Thanks Joe. I'll try that. I agree 100% about the older Mamiya 645s vs. the newer ones.