When you get to registration mode, press enter, then execute will appear, then press enter. Then display will say adjusting. Remember magenta, cyan and yellow register to black. If registration is still bad you need to remove the four drums and transfer belt. To the left you will see a plastic move it to the left and you will see a white plastic with two sensor one at each end. This clear plastic get dirty and then you have bad registration. Clean it with a Q-tip. This two sensors are locate just below the left of the transfer belt, one at each side. This usually get dirty with residue of toner.