Genie Carriage

Garage door not closing all the way HELP!!?

My garage door only closes like around halfway and then opens back up. There is nothing in the way of the door closing and I even unhooked the door from the carriage but still it only goes to halfway and then goes back. Is there like a timing belt adjuster or something like that because this started happening a couple of days ago and before that there was never any problems with it. What can I do? I really don't have the money right now to go and buy a new opener. If it helps I have a Genie Model 940A.
P.S. I have an electric opening garage door but oddly enough I'm the only one around here that doesn't have the lasers.

there is a sensitivity screw you can increase the down force check the rail make sure all seams are tight spray w d 40 and clean dirt with rag when running and re lubricate with grease. check photo eyes make sure they aren't a little off , make sure when the top section comes down its not hitting the trigger type limit, if this unit has a red box the sensitivity adjustment is under the tape that says genie slide this out ,vinyl screw under. the number for genie is.... 1800 ok genie.

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