On Sun, 12 Jan 2020 18:06:00 -0600, Dean Hoffman
wrote:

On 1/12/20 6:01 PM, wrote:
On Sun, 12 Jan 2020 10:50:45 -0800 (PST), trader_4
wrote:

On Sunday, January 12, 2020 at 10:16:36 AM UTC-5, wrote:
On Sun, 12 Jan 2020 06:08:10 -0800 (PST), trader_4
wrote:

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"?



Thanks for your response.
Yes -
There is a copy of the installation manual at
https://www.scribd.com/doc/268502784...een&from_embed
and other places of which I have had a downloaded pdf copy.
As I read it, the 1280 has two controls for door travel distance up
and down and two other controls for the force put on the door as it
goes up and down. It talks about one control knob turn equals 2" of
door travel.

The thing is - right now the new belt is not on the opener at all.
Neither is the old belt. Ergo, the 'gear' on the top of the motor is
not engaged. When I press on the remote to run the opener, the 'gear,
runs, naturally. But it won't stop (unless I press on the remote
again). That 'gear' always spins in the same clockwise direction tho,
so I fear that if the belt were connected to the 'gear' and the slider
on the track, the belt would break when when the slider reaches its
limit (ie the door is closed). And so, I fear to go on.

Help?
Murph

The door opener has sensors that would presumably tell it when the door is
closed or fully open. Those would be adjusted with the two limit and two
force controls. Right now it makes sense that the motor would just keep
spinning, because it's not connected to the drive so the sensors think
it's not at the end of either range of motion. I thought jr put the
new belt on? Why did he start fiddling with the adjustments? Was it
working correctly before? Seems if it was working, one would just replace
the old belt without screwing with anything else and it should work as it
did before. If it didn't, maybe he screwed something, like a sensor,
while changing the belt. I can see as a last step, fiddling with the
sensor adjustment, if needed for some reason. Is the door balanced,
moves freely when disengaged?


Ohboy!

First thing first - I must have said something that indicated that my
son was involved. That is not the case. It was my next door
neighbor. My poor son is always getting blamed. Just ask him. Haha.

My neighbor has not returned by the way.

You are right on that one w/should replace the belt positioned just
the way the old one was. All the relative Youtube videos say just
that. But my old belt broke some time ago, and the motor kept
running st the time with the belt and slider mechanism amok. So I
have no idea where things were.

That said, when my neighbor said and did what he did (adjusting the
sensors) I couldn't see what he was doing exactly because he was on
the ladder, and I was on the floor, as I said before. He said he knew
what he was doing. Blind faith got me in trouble.

I would really like to be able to try the sensors to base settings (ie
factory settings), and try from there. Like, u know, at zero.
minimum, all the way clockwise, or some such.

Murph

I'd probably get the belt on. Then you'd be able to stand there
with the control
in hand to see what the door does and go from there.

Hi

I thought of that. But if the motor does not stop, then I was afraid
when the belt reached the end of its travel length, wouldn't the new
belt just snap in two or at best pull apart? Maybe if I stood there
with thumb on the remote 'on' button to try to stop the damned thing
(assuming it would)?
Why is this so hard?
Maybe I should just call Liftmaster on 1-800-578-5880 tomorrow?

Murph