Workcenter xd103f copy comes out blank

Which cartridge did you change? If its the toner cartridge, make sure none of the packaging materal is left on it, same with the drum cartridge. First and simply remove and reseat the cartridges.
What I suspect with the blank copies is a broken transfer corotron wire.
Open the right side door. On the bottom you will see some whit plastic rollers. Above that you will see an opening about 1/2 inch wide. There is a very thin wire in that channel. That wire has probably broken causing your blank copies, I highly suspect that is broken.. That wire when it is dirty also causes really poor copy quality.
Also clean all the mirrors and glass well. That will cause poor copy quaility issues.