If your printer shows offline, there could be numerous things to cause it. To get it back online, follow theses steps.
Check to see if the printer is powered on. Often the printer’s power cord gets loose from the back of the printer or power outlet and will cause the printer to show offline.
A loose parallel, Ethernet or USB data cable will also cause the printer to show offline. If this is the case, shut off the printer and reconnect the data cable properly. Once the parallel, Ethernet or USB data cable is reconnected, return power to the printer and check to see if the printer shows offline.
Is the D, the DN, the T and the TN able to use the same drivers? Sometimes the same drivers will function normally but don’t always count on it so if you are swapping printers while one is under repair, add the correct drivers to print without issues.
If you are not careful, printers can be duplicated causing issues so be sure to check the Devices and Printers section to see if ‘copy’ is amended to a printer name. Another form is one printer for each network account user that had sign in.
If someone forgot to give the network printer a static IP Address, you may find this has changed so make sure that the IP Address in Devices and Printers matches the one in the printer. Also, If a printer has moved from LPT1 (parallel) to USB, this will cause issues as well.
If the shared printed on a PC got reinstalled, you will need to sync your connection once more for all guest.