Xerox 8400B - Phaser Color Solid Ink Printer Reference Manual page 152

c. Replace all trays and push each one completely to the back of the printer.
Note
Use only the approved paper type, weight, and size for the tray. Custom size paper can
be used in Tray 1 only.
For additional information, go to www.phaserSMART.com.
Phaser® 8400 Color Printer
4-11
Paper Jams
8400-005