on the bottom base plate for hidden screws.
Be careful not to over-tighten.
c. Ensure there is no film in the camera. Open the back and continue
your inspection for loose screws in the film supply and take-up chambers.
d. Using your soft brush or compressed air canister, dust or blow
debris and film fragments from the camera's interior. Be careful that you
don't strike or blow air on the shutter curtain (single lens reflex cameras)
because they are easily damaged.
e. While you have the camera open, you can make a quick shutter
Open the f/stop to wide-open.
While looking through the
back of the camera, cock and fire the shutter several times at each speed
You can watch the shutter cycle from closed to open then closed
again. This works with both focal plane and between the lens shutters. You
should see a change in the time of the cycle as you work your way through
the speed settings. If not, see your camera repairman.
f. You should next make a lens aperture check. Set the shutter speed
on "B." Wind and trip the shutter. It should remain open. While viewing
the aperture leafs, rotate the aperture ring through its full-range and
back. The aperture should maintain a circular shape as it gets smaller and
larger, as you turn the ring. If it does not, see your camera repairman.
g. If your camera has an automatic aperture stop down feature, you can
run this check.
Set the f/stop at 11 or 16 and the shutter speed at 1/2
second or one second. Wind and trip the shutter while again looking through
the open camera back. The aperture should move smoothly from open to the
present aperture without a stop or hesitation.
h. Clean all electrical contacts.
Remove the battery and using a
common pencil eraser, clean the contacts on the battery, in the battery
housing, and the cap or screw cover that holds the battery in place. All
these contacts should be shiny and free of oil.
i. Check your battery with the camera battery check or a voltmeter. If
the camera has not been used for six or more months, consider replacing the
old battery with a new one.
Batteries go bad from lack of use nearly as
rapidly as with constant use.