6f5f31d5_Printer_Error_Code_Information__Solutions
[Error Code] 975-979 Network Card X [Error Message] Indicate a network card failure in the specified slot, X=any card in slot 1 or 2. 975- Unrecognizable Network Card 976- Unrecoverable software error in network card X 979- Flash parts failed while programming card X If the printer is a network model, replace system board [Solutions] 
System Board Pricing
Lexmark Printer Error Code Information
Solutions