Craftsman 139.53904D Manual Del Propietário página 29

ADJUSTMENT STEP 3
Testthe SafetyReversal System
TEST
• With the door fully open, place a 1-1/2" (3.8 cm) board (or a
2x4 laid flat) on the floor, centered under the garage door.
• Operatethe door in the down direction. The door must reverse
on striking the obstruction.
ADJUST
• If the door stops on the obstruction, it is not traveling far
enough in the down direction. Increasethe DOWNlimit by
turning the DOWNlimit adjustment screw counterclockwise 1/4
turn.
NOTE: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 25.
° Repeatthe test.
° When the door reverses on the 1-1/2" (3.8 cm) board, remove
the obstruction and run the opener through 3 or 4 complete
travel cycles to test adjustment.
° If the unit continues to fail the Safety ReverseTest, call for a
trained door systems technician.
IMPORTANTSAFETYCHECK:
Test the Safety ReverseSystem after:
• Each adjustment of door arm length, limits, or force 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.
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLYINJUREDor
KILLED by a closing garage door.
• Safety reversal system MUST be tested every month.
• If one control (force or travel limits) is adjusted, the other
control may also need adjustment.
° After ANY adjustments are made, the safety reversal system
MUST be tested. Door MUST reverse on contact with
1-1/2" (3.8 cm) high object (or 2x4 laid flat) on the floor.
(or a 2x4 laid flat)
ADJUSTMENT STEP 4
Test The ProtectorSysterr
° Press the remote control push button to open the door.
° Placethe 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 (2.5 cm), and the opener
lights will flash.
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).
If the opener closes the door when the safety reversingsensor
is obstructed(and the sensorsare no more than 6" (15 cm)
above the floor), call for a trained door systemstechnician.
Without a properly installed safety reversing sensor, persons
(particularly small children) could be SERIOUSLYINJUREDor
KILLED by a closing garage door.
Safety Reversing Sensor Safety Reversing Sensor
29