Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Check to see if the trolley is jammed against the bolt just in front of the motor housing. If it is you need to loosen the chain enough to release the tension and then run the opener until the door is closed.While the door is closed, locate the 'up limit' control on the side of the motor unit. Turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.
Posted on Apr 04, 2011
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Posted on Jan 02, 2017
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1. No operation - no panel lights: DC Volts
Upper Circuit Board
Lower Circuit Board
I would start with the DC volatage and track it back until you lose it. Most of the time it does end up being the lower circuit board though.
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