Fuji GS645W lens removal

[campy51]

I will be buying a GS645W that has one of the aperture blades not moving. Anyone have any tips removing lens and on fixing it?

 

[OAPOli]

I've worked on one but didn't remove the shutter.

From the rear there is a little circular baffle that you can unscrew, giving you access to the rear lens and shutter retaining ring. The issue is that the shutter is attached to the body via a bunch of cables for the the flash and light meter. I don't know how to deal with those; you likely have to take the top cover and see where the wires go. Take out the advance lever via rubber tool, plus three screws around the cover. You probably also need to take the front covers to make sure everything clears. There are two screws behind plastic discs on the right and more under the textured grip cover on the left.

The conical cover around the lens is quite hard to remove, there are three screws behind. The control rings come out easily but watch out for the the thin contact arms for the meter coupling: they are very fragile. At that point you should have a familiar shutter in front of you.

Working on the aperture mechanism requires you to take the shutter almost entirely apart. Take out the self-timer, escapement, levers and springs, etc., then split the shutter in half via four screws in the rear. Do this slowly to check how the shutter leaves are configured. The rear half has the aperture system. Consider the possibility that the pin on the aperture blade has broken off.