6f5f31d5_Printer_Error_Code_Information__Solutions
[Error Code] Error 31 [Error Message] Error code 31 is displayed when the top front cover is closed and a defective print cartridge is detected. It may take the printer 10-20 seconds to determine if the print cartridge is defective. Note: This error indicates the printer was able to read the cartridge ID, but the ID did not pass the verification test. [Solutions] 
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Lexmark Printer Error Code Information
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