On Sunday, January 12, 2020 at 6:38:15 AM UTC-5, wrote:
I have a 10 year old Liftmaster 1280/2280 Garage Door belt opener. The
belt wore out and was coming apart.
I Bought a new belt off Ebay.
I Removed the old belt.
I quickly found that my 90 year old legs wouldn't support me on my
stepladder.
I enlisted the aid of my younger neighbor.
I dunno what he did, but before he connected the new belt, he played
with the two 'up and down travel limit' controls on the side and the
two 'Force adjustmnt controls' on the back and messed them up.
Then he quit on me.
I need to try to correct the control settings. I want to reset them
back to their starting point. They certainly are not what they were
when we started.

Has anyone out there had to mess with this problem?
Maybe I need a 'professional' for this?
Thanks
Murphy


Did you Google for "Liftmaster 1280 Installation Instructions"?