My ValueJet prints a black line on both edges of the media, how do I turn this off.

The function is called "Flushing"

This is a firing of the nozzles on each pass of the carriage.

Go to "Set Up" in the menu.

Here is a menu structure:
http://www.mutoh.com/products/ValueJet/VJMenu.html

Change "Flushing" from "On Media" to "Origin"

The nozzles will then fire on the sponge pad located near the right side of the machine.