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This blog post outlines repair procedures for stuck lens covers. An A400 is used as an example. The A720 is more complex, but the base procedures are similar:
I have a solution posted in doc "nikon s5 s6 lens cover error repair.doc" uploaded on site http://www.esnips.com/web/papputatiyasStuffIt will be helpfull for you. Its is a step by step solution with images. RegardsMukesh
Try blowing lots of compressed air around the open lens shutter to clean the mechanism. Or use a hair dryer for a few seconds (don't want to heat up the camera). Also with the lens barrel extended and pointed downward, tap the lens barrel with a pencil while you extend and retract the lens by powering the camera on and off. A grain of sand in the mechanism is usually the culprit, and you want to try to dislodge it.
You can open it up, but only as a very last resort. The above procedures usually work if you try them enough. But for those particularly nasty stuck mechanisms, here's an example repair on a Canon Powershot A400 (do this at your own risk):
http://camerarepair.blogspot.com/2007/11/repair-of-stuck-lens-covers.html
I know this is an old post, but for those who want to fix it themselves: try blowing lots of compressed air around the open lens shutter to clean the mechanism. Or use a hair dryer for a few seconds (don't want to heat up the camera). Also with the lens barrel extended and pointed downward, tap the lens barrel with a pencil while you extend and retract the lens by powering the camera on and off. A grain of sand in the mechanism is usually the culprit, and you want to try to dislodge it.
You can open it up, but only as a very last resort. The above procedures usually work if you try them enough. But for those particularly nasty stuck mechanisms, here's an example repair on a Canon Powershot A400 (do this at your own risk):
If you're careful this problem is a relatively easy fix for many digital cameras. The design of the lens cover mechanism is usually simple and very similar throughout camera brands. Here's an example fix for a Canon A400 with similar problems:
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