Crftmn 1/2 hp buzzes--- then nothing
My 1/2 HP Craftsman 139.53627SRT (manufactured in '93) doesn't work anymore.
The lightbulbs on the main unit work and the green sensor lights are steady. However, when I try to open or close it with the wall mounted button or the remote, the opener doesn't react. The unit just makes a buzzing sound for a moment or so right after i press the button to open or close it. there is no movement in the unit's gears (i took off the cover and looked) nor along the track. also, there doesn;t appear to be anything stcuk in the gears preventing its movement. this same sound ocuurs whether the door is engaged or disengaged to the track. the door opens fine manually.
any ideas would be greatly appreciated!