Hi Jonboz.
Thank you for using the forum.
Please check the knowledge base for this product at:
http://www.support.xerox.com/support/phaser-6120/support/enus.html
There are several solutions documented but there are details that would need to be identified to find the right solution.
You may need to contact support at 1-800-835-6100 or by using this form: FastTrack to the Expert, so they may assist you.
I've only printed 3300 copies on the printer, but now it prints about 1/4 to 1/3 of the way down from the top of the page, leaving a large, unprinted area at the top of the page. Also, I get paper jam alerts, even when there is no jam. Any suggestions? Thanks.