Quoted from skink91:Earlier today I had the same problem and found the washers on the ramp mechanism were rubbing against a screw when trying to close/drop the ramp. I dremeled the washers a bit for clearance and it stopped happening... maybe the same problem for you?
I think you can do coil test #20 and #15 to watch it happen.
Mine was doing the same thing. I removed the star washer behind that screw, added a thin plastic washer behind the magnet coil and adjusted the throw of the steel plate that locks the ramp as close as i could to the magnet. It seems to have done the trick. The mech doesn't impress me.