Test The Protector System; Test The Safety Reverse System - Chamberlain 3500 - 1/2HP Series Owner's Manual

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 light 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 or button until
down travel is completed.
Adjustment Step 4

Test the Safety Reverse System

Test:
• 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 26.
• 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.
®
Safety Reversing Sensor
Important safety check:
Repeat Adjustment Steps 1, 2 and 4 after:
• Each adjustment of door arm length, force controls
• Any repair to or adjustment of the garage door
• Any repair to or buckling of the garage floor.
• Any repair to or adjustment of the opener.
30
WARNING
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
Failure to test and adjust the safety reverse
system may result in serious injury or death to
persons trapped by a closing garage door.
Repeat this test once a month and adjust as
needed.
GARAGE DOOR
or limit controls.
(including springs and hardware).
Safety Reversing Sensor
2x4 laid flat