I had this problem a week ago on a vacation using my 1st beginner's DSLR ,a Nikon D40.
If its under Nikon Warantee,you can turn in to the dealer & wait for the repair but what if its beyond warantee period, or you bought it used with expired Warantee?
Here's my solution to fix it to save some repair charges and guess it might bless someone with the same problem there.
There is a gear motor that controls the tripping of the Shutter Release mechanism and over time,it either gets a bit tight to turn over or just contaminated with dust & needed soe light lubrication to get it back to normal( provided the motor is still ok).
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Signing UpStep 1Tools & Stuffs You need
Small Watch Maker's Phillips Screw Driver
Toothpick,
Can of Spray Grease (or any General Purpose Light duty Grease)
Tissue Paper
A Clean Dust free Environment
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I came to this site, and followed the steps that you described above. I used "Phil Wood" bike grease. After adding a little bit of grease, it worked, then then error came back. I added a bit more grease, and spun the red gear some more. Then it worked fine.
It's been a day and the camera is working fine. Thanks so much for your incredibly detailed and helpful guide. What an amazing resource!
I would also be concerned with high pressure release of the grease, which may find its way to shutter curtains or the sensor. If your spray grease is compatible with plastic gears I would suggest spraying in a small container (i.e., a bottle cap) and applying from there using a toothpick.
Otherwise, if it really works, great instructable.
My two cents,
Koray