I have a Lexmark X6570 All In One Wi-Fi model. Just had the problem where I went to print and received an error message saying that the cover was open (when it wasn't). I noticed that the back right hand corner had slightly popped out of place for no apparent reason. Tried to pus it back into place with no luck.
Here's what happened and how to fix it:
There are two plastic hinges at the back of the 6500 series printers that allow the top cover to open for access to the ink cartridge carriage. The lower ends of the hinges are cylindrical shaped and each contains a very stiff steel spring inside. They are designed to prop the cover of the printer up and hold it open when opened. As the plastic material ages, it may weaken and the tension of the internal spring may break the round end of the hinge off. This causes the printer cover to not fully close (even though it may appear so). There is a switch in the main printer body that detects when the top cover it open (even partially), and the printer won't work in this condition.
To fix this, open the top cover and carefully disconnect the 3 wire harnesses and the ribbon cable that run from the top cover to the base of the printer. Then remove the 'paper jam' hatch cover from the back of the printer. There are two phillips screws on the back panel of the pinter (one is located behind the paper jam hatch cover). Remove these screws (they secure the plastic hinges in place). You should now be able to lift the complete top cover/ scanner table assembly off the rest of the printer. Look for a steel spring about 3 inches long...remove this along with the round base of the hinge which may have broken off and remained down inside the printer. Glue this piece back onto the end of the hinge, but leave the spring out. Now reassemble the printer in the reverse order of disassembly and you should be good to go. Note that the top cover or the printer will not stay propped open on it's own with the spring removed, but this is not really an issue.
I am not sure if new replacement hinges are readily available from Lexmark or other sources.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/john_472b46f833fc3109
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