Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
I have replaced the battery, however it is still not working. I've tried to find the instruction manual via Sears site but could not to check to see if I put the battery in the correct way, if I need to reprogram it or just what's up!
i had a problem with my craftsman 1/2 horse g.d.o.not being able to go down .it wouldnt reverse and close the door.after the second day of messing with it checking all the normal problems like the lite sensors and door binding and checking and setting the limit switches i was about to give up when i noticed that when i pressed the transmitter button to activate it to go down, there was a clicking in a selonoid that was attached to the printed circuit board.i looked it over again and again but i didnt see the problem when i deceided to use the ol "hit it with something trick" lol.well that didnt work either but what did work was to just use a insulated screwdriver and working from the circuit board side i gently pried the selenoid ever so slightely and it sparked and viola,the door went down.i guess what had happened was the selonoid had grounded itself out and it is what controls the "reversing" of the motor.this g.d.o.is 13 years old and it now works great again.so, set your limit switches ,check for any door binding and look over the printed circuit board very closely.listen for any clicking and investigate.
Posted on Oct 10, 2008
Loosen the inner nut on the trolley. (That is the lock nut). Then tighten the outer nut on the trolley to increase tension. The outer nut on the trolley is closest to the garage door. The chain tension should be 1/2 inch off the rail at midspan. (The chain is fastened to a threaded bolt on to the trolley. The threaded bolt has an inner and outer nut). Hope this helps.
Posted on Dec 24, 2008
Make sure the batteries are good in your remotes. Next it might be your openers logic board. Get the numbers off the unit and look for a replacement on ebay as there are plenty of used good parts out there, heck even new ones if you want to spend the extra cash.
Posted on May 16, 2009
According to Sears your model number is bad. Double check the number and they will have the owners manual with complete installation instructions.
Posted on Sep 25, 2009
I am going to assume you have short range with your remotes and give you some stuff to check.
Limited range of your remote controls could be related to radio frequency interference that comes from something in your home or in the surrounding environment. Certain electrical devices can radiate interference; this could be almost anything that is plugged into an electrical outlet.
Please keep in mind that the device can be brand new, or can be an item that has been in use for quite a while. Also, the item may continue to function properly as far as you are able to tell. The only problem with the item may be that it has started to broadcast the interference, with no other symptoms noted.
Some devices are more likely to generate interference than others. This includes TV cable, cable amplifiers, surge protectors, fluorescent lights, battery charging devices (power tools, golf carts, etc.), anything that utilizes a timer (sprinkler systems, lights, alarm systems, etc.), and a myriad of others. If the problem seems sporadic, we can safely assume that the device responsible for the interference is only being operated during these times. Again, please keep in mind that the age of the device does not determine if it is capable of broadcasting unwanted interference. Any electrical device can be the source of the problem.
The first step is replacing the battery in your remote. If the range on your remote does not improve, remove the wall control wires from the overhead unit. If the range does not improve you will likely need to replace the remote control. After replacing the remote, or if you have other remotes programmed in to the opener, and the range problem still exists, please proceed to the Power Down test.
Multiple garage doors:
If you have two garage door units and one is working just fine, you will need to start by unplugging the good unit. This will help determine if the unit with no range starts to function properly. If the range comes back to the bad unit then you will need to replace the logic board on the unit that was unplugged as it is emitting an RF signal that is over powering the other garage door opener. If the range doesn not improve after the “good” unit has been unplugged, replace the batteries and try programming some additional remotes to determine if the existing remotes are the issue. If the extra remotes do not have any range then you would need to replace the receiver logic board in the “bad” unit.
Power Down test:
To isolate potential sources of interference, turn the circuit breaker off to the garage and plug the garage door opener into an extension cord from another room. If the range improves, then the interference is coming from a device in the garage. If no improvement is seen follow the same procedure, this time turning off the circuit breakers to your home, with the exception of the garage and test the remote controls. If improvement is noted, turn the circuit breakers back on, one by one, until the range problem resurfaces. This will allow you to narrow down what room the problem device is in. You will have to go from there to isolate it further, by unplugging and re-plugging the items in that room.
If you are unable to determine any source of interference, then the receiver logic board in the overhead unit will need to be replaced.
Posted on Nov 20, 2009
Make sure that when inserting the 9 volt battery that those red & black wires are not somehow pinched, twisted or stretched. I just fixed mine... The battery terminal was crushing one of the wires and preventing the battery to supply power to the keypad. I found it out by NOT securing the battery case door and my opener worked fine. Securing the battery case door with the screw and thightening, my opener DID NOT WORK. It was that simploe of a FIX!
Posted on Jul 06, 2010
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the smart/learn button on the rear of the motor unit near where all
those white wires go. Press and immediately release this and then
walk over to the keypad and key in any 4 digit code you like and
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