Lexmark 4800 Series Duplex unit does not operate correctly, Removing an external print server

Duplex unit does not operate correctly

These are possible solutions. Try one or more of the following:

Check paper size and type

Check the paper size and type to make sure the paper is supported by the printer. If you are using automatic duplexing, use only letter- or A4-size plain paper.

Check for paper jams

Check for and clear any paper jams. For more information, see “Paper jam in the duplex unit” on page 139.

Make sure the duplex unit is properly installed

Remove the duplex unit and reinstall it. For more information, see “Paper jam in the duplex unit” on page 139.

Removing an external print server

1Press to turn the printer off.

2Make sure the power to the print server is off.

3Remove the USB cable from the external print server.

4Disconnect the external print server from the computer.

5Connect the printer USB cable to the printer.

6Press to turn the printer back on.

Cable is not connected, is loose, or is damaged

The printer cable must be fully connected and undamaged for proper communication.

Make sure the USB cable is connected to the USB port on the back of the computer

The USB port on the back of the computer is marked by . Plug the long, flat end of the USB cable into this port.

Make sure the other end of the USB cable is connected to the back of the printer

Plug the smaller, more square end of the USB cable into the back of the printer.

Make sure the cable is not damaged or loose

Make sure:

•The USB cable is not damaged.

•The light is on.

For more information, see the related topic below.

Printer is plugged in but does not print

These are possible solutions. Try one or more of the following:

Make sure the printer is set as the default printer

Try printing a test page.

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