Other devices attached to the computer can block proper communication. Check to see if there are any devices (other than USB keyboards or mice) connected to the computer. Disconnect the device( s ) and restart the computer. Once the computer has restarted, attempt your process again.
How to locate your printer's serial number you are using, you can check the serial number by printing out the network setting information of the printer For more on printing, search for "NR044" on your printer ' s Online Manual and see the instructions shown.
Fan paper prior to inserting it into the printer. Insert the stack of paper back into the tray (print side up for Auto Sheet Feeder, print side down for Cassette). Slide the paper guide( s ) to fit the loaded paper stack. Press <Resume>.
Perform White Level calibration 4. Click the White Level button. 5. Load the white calibration sheet into the printer s sheet feeder (as if you were going to print on it) with the cut corner in the upper left position. 6. Click OK.