Open chassis, remove operating on key printing plate, press the button switch, inelastic when found the EJECT button press, on both ends of the resistance measurement with multimeter R x 100, when when broken, when pressed, also render time break phenomenon. Show that the key switch in reed have lost their elastic fatigue. For the switch is ultra-thin, no one can change, try to get off after switch on the sheet metal heating, pour in the switch failure of reeds, will contact scrub clean, find another common keys with the same size in the reed mount, restorable, try pressing feel normal, good contact with three with table test, on and off altogether. Installed the trial, everything is back to normal.bHWservice manual download site