Question about Chamberlain 740CB Wireless Keyless Entry System

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How do you remove the chamberlain 740 CB wireless keyless entry system? I can't find the mounting screw other than the one behind the battery

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There is another screw on top but it is covered buy a plug.

pop out the plug and you will find the screw. if you do not plan on keeping it you can drill a small hole into the plug and screw the bottom screw into the hole somewhat and now you can pull the plug.

good luck!

Posted on Aug 16, 2010

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How do you replace the battery? where isist?


slide the bottom part of the keypad down the battery is a 12Volt (a-23)

if it doesn't slide remove the bottom screw.

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I don't know this model. (in australia). the chamberlains here are probably the same. the 4 digit code you first put in the keypad is what you have to use. push the learn button on your operator then punch in your 4 digit No. Hold the enter button on your keypad until the light flashes on the operator.
That should code it in.
freddy51

Feb 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The Chamberlain wireless keyless entry model 940CD doesn't work. I changed the 9 volt battery, but it doesn't light up or do anything when I enter the password. It's like it's totally dead. I've had it for...


make sure it is the right keyless entry. For starters, Make sure your antenna hanging off the operator is "purple" color. If it is grey, you have the wrong keyless entry. The keyless you have is for the 315 frequency. If your antenna from the operator is grey, you need to get another keyless entry based on the frequency.

Oct 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Programming my keyless entry


Yes, you purchased the wrong wireless. You must get a Genie keyless and there are two types of Genie keyless (GWKP & GWK-BL) depending on which Genie operator you have. You might think about a wired keyless entry (Domino GD-1). Then if you change your operator you don't have to change your keyless.

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Sears Wireless keypad will close door but will not open


If you are sure the battery is good than it sound like the keypad is bad and needs to be replaced. With a 6+ year old operator I would suggest a wired keyless entry (Donino GD-1) so if the operator has to be replaced you can use the same keyless entry.

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