Did a few searches with the exact error message "Communication Not Available" and found a few suggestions which worked. One is to stop the print spooler, the other to adjust power management settings. Not sure which did the trick but printer working OK now. Here is link:
I Have an older Lexmark 5600 printer. Had to uninstall / reinstall after I upgraded my PC to Windows 10 last year, but it worked OK since. Recently it abruptly stopped communicating with my PC properly. Tried the uninstall / reinstall, checked USB cable, cartridges are good. I even did a system restore on PC but no luck! Scanner works OK but print dialogue box has question marks where ink level usually displays. After long delay, error message says "Unable To Communicate..." I'm guessing it's a Windows 10 compatibility / support issue. Any suggestions?