“Error Number : 311 Printer is in use or an error has occurred. If an error has occurred, eliminate the cause of the error.”
After getting this dumb error, I did all obvious things, restarted the computer, restarted the printer, upgraded the drives, searched, and found others who’ve gotten the same error, all without success.
Finally, after even more playing around, I think I’ve hit upon the issue that I have a “print head error” that requires repair service. 🙁 I’ll find out tomorrow when their customer support is open.