Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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Posted on Jan 02, 2017
SOURCE: Garage Door doesn't close
The Craftsman GDO has a RPM sensor that, if not working correctly, will cause this problem. Either the optical sensor itself is dirty, or more likely, the wheel that is attached to the motor shaft has slipped. This is also a common problem if you have changed the worm drive. The motor shaft has about 3/16" of play (in and out) and if you do properly re-assemble the collar and leaf washer this play will prevent the RPM wheel from working properly.
Posted on Dec 24, 2007
You have loose wire(s). After speaking with Genie Customer Service, they had me disconect a few of the wires and try operating the unit, to no avail. I noticed when reconnecting the wires that several other wires on the same row of connections were loose. I tightened all wire connections and VOILA, it works.
1.Open plastic cover in front of the Unit.
2. Look on upper right corner for a row of screws. Model 2020L has a verticle row of (6) connection screws numbered from top to bottom, 1-6. These screws connet to a green circuit board. Looks kind of like a video card from a computer.
3. Tighten all these screws top to bottom assuring good connection of all wires.
My contention is this. As the motor runs, it causes a vibration that tends to loosen those screws causing a faulty connection to the circuit board. Hope this works for you.
Posted on Nov 24, 2008
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