Canon A-1, film advance lever and shutter release

SOURCE: I have an Canon AE-1 and the film advance lever

The film is either at the end or stuck. The shutter will not release unless the film advance lever has gone all the way and back.
Make a note of the frame counter. Rewind the film and remove it from the camera (When you feel the film to come loose from the receiving spool, stop rewinding to prevent the end of the film to disappear inside the can. This way you can reload it if it was stuck in the middle.) If the film was completely exposed, take it to be developed.
With the empty camera, try to advance the lever and release the shutter. If this works, the problem was the film and not the camera. Everything is fine. If the problem persists, take it to be repaired.
If the film was stuck in the middle, load it again into the camera. With the lense cap on (preferably in a dark room or similar) 'shoot' as many 'empty' frames as you had on the counter plus two more. Finish the film and develop the pictures.
If the film stucks again at the same place, rewind it and develop normally. It was a bad film.
Hope this helped you to solve the problem.

SOURCE: nikon fm10 cannot get shuuter release button to

The film lever is also a switch. If you had advanced the film lever, **** it outward a little. You will feel the detent click somewhat when doing so. Leave the lever outward and see if the shutter will work. The detent is for appling an closed circuit for the light meter. When the lever is fully pushed back in it shuts the power to the meter on off to conserve battery power

SOURCE: Film advance lever and shutter release button are "stuck"

No, it is not the battery. My guess is that the film leader did not stay in the take-up spool and is now bunched up around it. Try rewinding the film carefully as you normally would but remember that you are only rewinding a small portion of the length. You can even just open the film door and start over. You will only loose 3 or 4 frames on the roll.

SOURCE: I have an old Asahi Pentax, release lever and shutter are stuck.

The Pentax is a easy fix, maybe.. If you feel comfortable removing the bottom cover, then remove the 3 cross point screws. The battery, if installed will be loose. Looking at the bottom section of the camera, locate the tripod socket. On on side is the battery compartment, the other an L shaped lever. Under the L shaped lever is a brass plate with a slot in it. In that slot is another lever that has a spring going through the end eyelet. Move that lever toward the front of the camera until it latches on the L shaped lever above. Then try the release.

The first thing to try on the X700 is fresh batteries. Clean the battery cap and contacts with a pencil eraser.

SOURCE: pentax me super mirror in up position

If the batteries are flat or missing you wont get LED's to light up and it will set itself to 125 naturally. I know as I have tried it. It could be that the shutter has got stuck on its way down and it is preventing the mirror from coming down as a result this is a mechanical issue, not battery related. The best way I found to release the mirror was to gently, really gently stroke the shutter nearest to the film down towards the groove it goes home in. Recommend a cotton budd so you don't damage the shutter leaves or get grease from your fingers on the movement. This should release the mirror. The next thing to do is try preventing the shutter getting stuck again by removing the bottom plate which will allow you access to the cogs for the shutter. it is tight in there and it is recommended by some that you remove some of the movement to see and clean them up. I did this but it is tricky and it involves winding on the camera and rocking parts out with itself. Not easy to do. The shutter cogs are brass (or look like it) and they may have old oil stuck inbetween the teeth which needs cleaning out with a tooth pick and then lubricate but not with WD40 which gets sticky with age. Use a cotton budd again with the lubricant on so you don't affect other sensitive parts around this section. Alternatively send the camera for a good service. I just had mine done, got it sorted with a warranty for 12 months to and cost me just £45. They cleaned everything up, new light seals and sorted issues common to this model of camera. The photos are instantly back to their best. Compare a good service to a series of wasted film with an inconsistent camera. Peace of mind too, it is worth it and so is the camera!