Originally posted by UncleVanya I disagree - but again I don't know this for certain. I just recall reading that the solenoid for aperture and something else shutter related is tied together in the low end shutter/aperture block and handled with separate solenoids in the high end systems like a K-3. I will try to dig that up but it's a needle in a haystack issue. I have been unable to find this and hope that someone else recalls where it is documented.
The K7/5/3/K01/KP and K1 don't use a solenoid at all. They use a sophisticated motor. (larger, more expensive)
Originally posted by UncleVanya To be clearer, what I recall (but can't find) was that eventually untreated the solenoid stops operating the shutter but since others are using their bodies for a long time... Perhaps I'm misremembering.
The solenoid is part of the aperture mechanism. The shutter and its mechanism are run also by 2 powerfull but very different solenoids. Of course all is linked
if one has an A-lens in use, but if one uses manual lenses in M-Mode, the solenoid is not used at all.
Applying series shots to losen up the stuck plunger of the solenoid can do further damage to the aperture-control-mechanism as at times does a filed/sanded solenoid but it does no damage to the shutterbox / shuttermechanism.
So usually a K-30 or any other body with a defunct solenoid will work fine in M-Mode.