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Liftmaster 1280-298LMC Manual

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Adjustment Step 4
Test the Safety Reverse System
Test:
• With the door fully open, place a 2x4 laid flat on
the floor, centered under the garage door.
• Operate the door in the down direction.
The door
must reverse on striking the obstruction.
Adjustment:
If the door
stops
on the obstruction, it is not traveling
far enough in the down direction.
• Increase the DOWN limit by turning the DOWN
limit adjustment screw counterclockwise 1/4 turn.
• Repeat the test.
On a sectional door, make sure limit
adjustments do not force the door arm beyond a
straight up and down position. See the
illustration on page 22.
• When the door reverses on the 2x4 laid flat,
remove the obstruction and run the opener through
3 or 4 complete travel cycles to test adjustment.
If the door will not reverse after repeated adjustment
attempts, call for professional garage door service.
Important safety check:
Repeat Adjustment Steps 1, 2 and 4 after:
• Each adjustment of door arm length, force controls
or limit controls.
• Any repair to or adjustment of the garage door
(including springs and hardware).
• Any repair to or buckling of the garage floor.
• Any repair to or adjustment of the opener.
2x4 laid flat
Failure to test and adjust the safety reverse
system may result in serious injury or death to
perons trapped by a closing garage door.
Repeat this test once a month and adjust as
needed.
26
Adjustment Step 3
Test the Protector System
®
• Press the remote control push button to open the
door.
• Place the opener carton in the path of the door.
• Press the remote control push button to close the
door.
The door will not move more than an inch,
and the opener lights will flash.
Professional service is required if the opener
closes the door when the safety reversing
sensor is obstructed.
The garage door opener will not close from a
remote if the indicator light in either sensor is off
(alerting you to the fact that the sensor is misaligned
or obstructed).
The garage door can be closed by pressing and
holding the Door Control push bar until down travel
is completed.
Détecteur inverseur de sécurité
Détecteur inverseur de sécurité
Without a properly working safety reversing
sensor, persons (particularly children) could be
seriously injured or killed if trapped by a closing
garage door.
Repeat this test once a month.
WARNING
WARNING
… 26 …


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