Originally posted by seventhdr
Take the lens off and try to auto focus. If it is the screw drive focus motor turning, you will see the little screw drive tip at about 5 o'clock what you look at the lens mount.
Also try to activate the depth of field preview around the shutter button to see if the aperture arm moves.
Regards
Chris
The screw drive tip at 5 o'clock is turning and is turning fast! So it is the "screw drive focus motor" that keeps turning? Not sure what that does but I am able to auto focus just like usual even though it keeps whirring.
Does this new revelation suggest any troubleshooting next steps I can try?
Thanks!
---------- Post added 08-18-14 at 06:21 PM ----------
Originally posted by DominicVII
Maybe you should try to take few pictures and make some movies without a lens attached to the camera so as to give yourself at least a vague idea of what could be going on inside that machine. Perhaps filming the events inside your camera and posting the video here could prove helpful in terms of determining what the problem might be. If it's corrosion, then there is obviously very little to be done.
That is a good idea. I will try to make a video.
Without the lens, there is only one moving part that I can see. It is the focus motor's screw tip. I can't seem to get any other parts to move. I don't know what the aperture arm is but I tried pushing all the buttons! Am sure people might recognize the whirring sound in a video too.