Question about Pentax ME Super 35mm SLR Camera

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Shutter button does not trigger

This symptom came about after I rapidly went through two films while photographing fireworks last Monday. I noticed that the mirror was no longer raising when I was taking pictures midway through my third film, and there was no tension on the shutter button. The cock indicator was orange (cocked), but the film advance lever advanced freely.

Having opened the top and bottom covers (which is as far as I've felt confident to go so far, with thanks to http://www.mypentax.com/PentaxMeSuper.html), I've found that the shutter was not quite completely cocked, hence the free lever. Having manually thrown the internal cocking lever all the way (http://www.mypentax.com/images/PentaxMES/Picture%20042.jpg) the shutter is fully cocked, and the lever locks as normal. The shutter button still does not engage, but by prodding about with a screwdriver I am unreliably able to trigger the 'scissor' through the hole indicated in the picture. As it's touch and go to get this to happen, I haven't been able to observe the mirror raising/falling, but I think it does.

Can anyone give any ideas as to which part has died? I'd tend to expect that I've sheared or bent something inside, but I don't want to delve deeper until I'm in proximity to my soldering iron (to detach the wires necessary) and know what I'm aiming for.

With thanks in advance.

Posted by krus_aragon on

  • krus_aragon Dec 11, 2007

    After reading up exhaustively on other repairs of this camera, I felt confident enough to open her up and have a look inside.

    The gunked rubber was not the problem (although it is a little soft and will need attention at a future date). The winder and shutter mechanism had slipped and disconnected from the mirror mechanism. The trigger button had released the mirror (which went up and down) but did not release the shutter. The winder wound the shutter, but did not wind the mirror. Realigning these components means that it's running fine again!

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zdenek vajdak

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The problem is actually the mirror box controlling mechanism and not the shutter it self ,strictly speaking. What is happening is that the locking /unlocking of mirror, when it is cocked, is gummed up by perished rubber bushings and rubber shock dumpers ( life span of 15-20 years max ) .
You need to get to the left hand side of the mirror box ( easy to locate once you take the m. box out ) and clean out with isopropanol ( can use benzine but is unhealthy ). Relatively easy but make a note of where the wiring goes ( shutter and l. meter ). And then also take care with the mirror box -cocking mechanism at the bottom ( draw picture of position before dismantling ).

Posted on Dec 05, 2007

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