Pentax K2 w/dodgy timing

Discussion in 'Pentax' started by Chris Barnard, Sep 2, 2003.

  1. Me again,

    Messing with my ME super has got me worried that I might need to swap to a
    different body for a while - I have a couple of other bodies but my new
    addition to the family is a K2, which I'd really like to take out and use
    soon. I fixed a stiff/squeaky aperture lever problem, but it seems to be
    having some trouble with it's shutter speeds. It sounds OK at the fast
    speeds (down to about 1/125) - but of course I appreciate it's probably near
    impossible to tell if it's actually working correctly without running some
    film through. However, from around 1/60 downwards, I can definately tell
    that the shutter is not firing in time - it seems a little 'random'. For
    example, at 1/30, sometimes it'll fire ok - other times it sounds closer to
    1/4 or 1/2. The 1 second setting can often take around 2 seconds, 8 seconds
    around 10. I know that some adjustment is possible via a set of
    potentiometers, but would I be able to fix 'random' shutter speeds in this
    way? It doesn't seem to be off by a particular amount. Anyone have any other
    ideas what might be causing it?


    Chris Barnard, Sep 2, 2003
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  2. Chris Barnard

    Mark Roberts Guest

    It might be just the mirror that's sticking. This is often caused by
    decaying foam in cameras as old as the K2. Try removing the lens and
    watching the mirror while firing the shutter. You may see it sticking to
    the foam padding around the focusing screen and remaining in the up
    position longer than it should. Pretty common and pretty simple to

    I have the K2 service manual available on line for free:
    Mark Roberts, Sep 2, 2003
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  3. Chris Barnard

    Pierre L Guest

    I had a brand new K2 in 1976 that behaved similar to what you described, ie.
    at the slower shutter speeds that you could actually hear long enough to
    time, the speeds sounded off. At the time, Pentax said you can't judge by
    the sound, and they said the speeds were Ok. This probably doesn't help you
    much, but my experience with a number of Pentax "K" cameras is that shutters
    usually have to be replaced after so many years.
    Pierre L, Sep 2, 2003
  4. Chris Barnard

    ChrisPlatt Guest

    Pentax K2 and K2DMD cameras use a vertical metal shutter.

    KX, KM and K1000 cameras use a horizontal cloth shutter.

    The latter almost never need replacement.
    They do require periodic service,
    about once every 5-10 years with normal use.

    Excelsior, you fatheads!
    ChrisPlatt, Sep 2, 2003
  5. Hi Mark,

    Thanks for the reply and also thanks for your website! I've already used the
    service manual from the site to help me fix the stiff aperture setting
    lever/ring. There's nothing like an exploded diagram to help you out of a
    camera-maintenance hole at 2:00AM ;)
    Unfortunately, I've tried firing the shutter with the mirror locked-up. It
    still fires seemingly randomly - so I don't think it's the mirror. It's
    definately noticable from 1/30th onwards - does this mean I have a sticky
    shutter or something? Is there anything I can do to fix it/figure out what
    the actual problem is?


    Chris Barnard, Sep 2, 2003
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