I searched for a solution, and found it quickly: this problem occurs when your network router assigns a different IP [Internet protocol] address to the printer, but Windows doesn't know about it.
Here is how to solve the problem:
1. Determine the current IP address of the printer. (I do this through my router's Web interface.)
2. Change the IP address in Windows, as follows:
a. Click Start and then Printers.
b. Right-click the problematic printer icon, and then choose Printer Properties.
c. Select the Ports tab.
d. Find the port for this printer; it'll look something like 192.168.1.7.
e. Click Configure Port.
f. In the Printer Name or IP Address text field, enter the correct IP address.
(Leave the Port Name alone, because you cannot edit it here.)
g. Click OK for all the open dialog boxes.
The printer should now work.
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