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Put the SD card in a computer to make sure you can read it.

 

Shine a light in the SD card slot - look for bits of plastic, hair and dust.  If you see any try to get it out with a toothpick or simlar.  Try putting a vacuum cleaner hose up to the slot to suck out any dust.  Use a cell phone with a light next to the camera - turn on the light and use the camera to look inside and look around for dirt, dust, things that shouldn't be in there.

 

I have had to repair a few of these - one had a hair in it, another had a tiny piece of blue plastic in it (which was vary hard to see against the black plastic).

 

Are you using the standard blue SD card that comes with the printer? SanDisk SDHC C4 (or faster) 4GB

 

The "C" in "C4" is almost a complete circle with the 4 inside.

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That little circuit board can be removed which will make it a little easier to get in there and shake/pry the piece out but it's still covered by a metal box.  Still I found it easier to take the board out.  

 

If you decide to do this first remove the primary control knob by pushing it off from behind (there is a hoel in the fogged/clear plastic housing just inside the printer - put a screwdriver through that to push the knob off). Then remove the large nut around the shaft for the knob.  Then remove the bottom cover - I think 4 screws?  2 screws?  

 

Then remove the 2 ribbon cables.  Pay attention to where the red stripe goes.

 

Then remove the 4 screws holding the circuit board and gently pull that board and the display out.  Be very careful with the display and the connecting wire.  I then removed the display - but if you don't know how to use those types of connectors maybe you shouldn't.  You have to get a tiny screwdriver in there and there is a part of the connector that slides apart and then the ribbon cable comes out with zero force.  If you aren't familiar with these maybe keep the display attached with a rubber band and some protective foam?

 

Then you can clean out the SD card slot.

 

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