Adjusting the Top Margin When you replace the Engine Controller Board, you must readjust the top margin as follows: Figure 6-43 Location of VR501 1 After setting the VR501 on the Engine Controller Board to the center position (0), load letter or A4 paper in the tray. Press the Engine Test Print Button (located on the left side of the printer, below the vent) to make several test prints. 6-46 Removing and Replacing Parts