Mamiya M645 1000s shutter sticking?

[Ektagraphic]

I see.

[pounder35]

It may be the battery but also check the battery contacts for any signs of corrosion. The inner contact and the ring around the chamber or the battery cap. I'm not sure of that design. Some cameras will use a metal battery cap for ground, if not and it's a plastic cap there will be a ring around the outside of the battery chamber that may need cleaning.