Xerox Phaser 3400 Reference Manual page 16

The printer prints the wrong data or incorrect characters
Make sure that your computer is connected to the printer with the right cable and is
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connected properly. Test whether the cable is defective by swapping the cable with
one known to work.
Make sure that you selected the correct printer driver.
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Test whether the software application is malfunctioning by printing a job from
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another application.
Make sure that the parallel port setting is set to one of these supported modes:
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Compatible, Nibble, Byte, or ECP.
If there is still a problem, reboot your computer and the printer, then re-submit the
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job.
Cannot select the optional Tray 2 in the driver
Configure the printer driver to recognize the optional tray.
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From the PCL 6 printer driver's properties, select the Paper tab and place a check
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in the Paper tray 2 installed check box.
From the PostScript printer driver's properties, select the Device Options tab,
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select Change settings for Paper Tray 2, and change the setting from
Not installed to Installed.
Reference Guide
Troubleshooting Printing Problems
11