A.Black B.Blue C.Red D.White
A.flux B.poles C.magnets D.azimuth
A.If the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should add some magnets B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray C.If the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should reverse the magnets D.If the blue ends of the magnets are forward,and the fore-and-aft tray is at the bottom,you should add some magnets