Nikon D90 Service Manual & Repair
Nikon D90 Service Manual & Repair
Nikon D90 User Guide Manual Operating Instructions download
error - Nikon D90 mirror stuck
Nikons from that era (D40, D50, D90, etc) have a couple of things
that are fairly well known to cause the dreaded 'Shutter Error" and/or
locked up mirror.
The first is that the main drive wheel for the shutter/mirror cocking
mechanism is dirty or needs lubrication. This wheel can be accessed on
many Nikon cameras by removing the floor plate of the camera. It's the
red wheel visible through a cutout in the metal chassis. A drop or two
of grease (I prefer white lithium) applied to the wheel with a toothpick
should do the trick. You want a fairly thick lubricant for this wheel,
but just a tiny dab will do. Spread it around evenly over the entire
circle of the wheel. (Please note: WD40 is NOT a lubricant. It is a
penetrating cleaner and water dispersant.) DO NOT spray grease from a
can directly into your camera - it can get in a lot of places you don't
want it to go!
This video
shows how to do the same thing with a D40, but most of the Dx0 models
from that time are very similar. (Note: he uses spray directly, but I do
not recommend doing so!)
The other problem area is also one that just needs a bit of
lubrication but is in an area harder to access. Disassembling the camera
to access the area is probably beyond all but the most capable
do-it-yourselfers. But there is a trick to getting a drop of machine oil
where it needs to be without taking anything apart. Use a straightened
paper clip to place
one tiny drop of oil on the post that is
the pivot around which the shutter and mirror cocking mechanisms rotate.
Here is an "exploded" diagram of the area. #208 is the aperture control
lever that is visible when your lens is removed.
And here is how you reach it without taking anything apart.
GENTLY pull the aperture linkage lever (indicated by the blue
arrow) down and hold it while inserting a straightened paper clip with a
drop of mineral oil on the end into the area marked by the blue arrow
and place the drop on the point where the other end of the aperture
lever pivots. I use sewing machine oil for this one. If the camera is
held in portrait orientation with the shutter button end up, the oil
will lubricate the post that both the shutter and mirror cocking
mechanisms also pivot, as they are all in there very close together. The
aperture lever is spring-loaded, and you don't want to let it slip out
from under your finger and bounce back unimpeded. That could allow the
spring to become unseated and then the camera will need to be
disassembled to be repaired!
After you've oiled and lubed your camera, cycle the shutter a few
times to spread it around a little. If it tests OK you're good to go. If
you're still getting the error or stuck mirror, then it's probably time
for a trip to a repair shop/service center or, if the cost would be as
much or more than the camera is worth, time for another camera.
How to repair a bent aperture arm on a Nikon camera
D800 with Non-AI Lens "ERR" Problem (Lens works with D7100 | Nikkor-P 105mm f/2.5)
