Epson WorkForce Enterprise WF-C21000 Series User Manual page 265

Solving Problems
The USB cable is not plugged into the electrical outlet correctly.
Solutions
Connect the USB cable securely to the printer and the computer.
There is a problem with the USB hub.
Solutions
If you are using a USB hub, try to connect the printer directly to the computer.
There is a problem with the USB cable or the USB inlet.
Solutions
If the USB cable cannot be recognized, change the port, or change the USB cable.
You need to reconfigure the USB connection.
Solutions
Disconnect the USB cable from the computer. Right-click on the printer icon displayed on the computer,
and then select Remove Device. Next, connect the USB cable to the computer.
If you cannot use a USB cable, reset the USB connection by following the steps for changing the method
of connecting to a computer. See the related information link below for details.
"Making Settings for Connecting to the Computer" on page 303
&
The printer is connected to a SuperSpeed USB port.
Solutions
If you connect the printer to a SuperSpeed USB port using a USB 2.0 cable, a communication error may
occur on some computers. In this case, re-connect the printer using one of the following methods.
❏ Use a USB 3.0 cable.
❏ Connect to a Hi-Speed USB port on the computer.
❏ Connect to a SuperSpeed USB port other than the port that generated the communication error.
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The Printer Does Not Work as Expected
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Cannot Send or Receive Faxes
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