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I have a Lexmark 3400 saying cover open. I've check several web sites and found explainations that seem much too involved. At this point, I'd like to give it a try rather than buying a new printer/scanner.

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This happens if the lever arm of cover sensor has fallen off'. if you take the scanner part off the top, and the grayish plastic bit unscrewed and popped off, there is a white nylon lever arm that should be seen sticking up thru a rectangular hole...roughly about 1/2" to the right of the printhead behind it. This lever arm clips onto a microswitch/sensor (the lid switch).you can pop the white nylon bit back on and press to fix, .
This sensor is mounted on the circuit board about midway across, and you can see it if you look straight down, through the hole in the black plastic shrouding that covers the circuit board.
It might be possible to snap the part back on without partial disassembly, or simply shove something in there to hold the sensor in the 'closed' possition .hope this helps?thanks and Godbless

Posted on Dec 13, 2008

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