Need help diagnosing Mamiya M645 (not 1000s)

Discussion in 'Medium Format Cameras and Accessories' started by natertots, Mar 12, 2014.

  1. natertots

    natertots Member

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    Recently I purchased a Mamiya M645. While its exterior is in great condition, the shutter does not work. It has a peculiar issue where the shutter button only opens the shutter and it uses the battery check button to bring in the second part of the shutter (to stop the exposure). If needed, I can record video of this. Is there any way to fix this without having to buy a new body? The exterior is nearly perfect and it'd be a shame for it to just be a paperweight. Thank you.
     
  2. alexfoto

    alexfoto Member

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    -This happen when the battery is exhausted, check the battery and replace with new one.
     
  3. natertots

    natertots Member

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    I bought a fresh PX28 lithium battery for it since I couldn't find anything else in my area when I first got it. Do I need true silver oxide batteries for it to function?
     
  4. agfarapid

    agfarapid Subscriber

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    No, you don't need silver oxide. I use an Alkaline 4LR44 6V. I bought 5 of them for about $10 on Amazon. Apparently, these are mainly used on dog collars to power dog owners' electric fences. They've been working fine for me for the past several weeks on my orginal Mamiya 645 as well as the later 645 Super. Also, your shutter will hang up if you place the shutter dial on the little round circle between 500 sec and B.
     
  5. MattKing

    MattKing Subscriber

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    Be careful with the lithium batteries. They are different from the other options, and your camera came out a long time before they were invented.

    Mamiya used to have a compatibility chart on the internet that listed which cameras were (and were not) suitable for using the lithium batteries.

    The alkaline batteries work on the Super and the Pro bodies I have owned, but they don't last particularly long.
     
  6. dorff

    dorff Member

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    +1. The alkaline batteries seem to last quite long enough for a few dozen rolls, though. I have RZ67 Pro II, Pentax 67 II and Mamiya Pro TL bodies that use them, and I replace a battery on average once every six months to a year.
     
  7. alexfoto

    alexfoto Member

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    -I use alkaline and last long in my old 645, i shoot now my 19 roll of film, and the battery check led look bright.
     
  8. BMbikerider

    BMbikerider Member

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    This may be due to sticking magnets on the electronically controlled shutter and may possibly be cleared after a good clean and service. The same happens to Minolta models (XG1! and later) and can almost always be restored to full working order.