The last Xerox PPD for this machine was in 2004, OSX 10.7 and above are not supported.
You may be able to make it print by installing it manually and use the Generic Postscript driver within OSX, but it isn't guaranteed to work.
My 5400 has been working beautifully forever but my recent upgrade to Sierra has it NOT RESPONDING at all. It's a simple dcevice. Does anyone know how to get these two talking? (Sierra and Phaser 5400 I mean) Frustrating...