Adjustment; Introduction - Craftsman 139.3043 Owner's Manual

ADJUSTMENT

Introduction

Your garage door opener is designed with electronic controls to
make setup and adjustments easy. The adjustments allow you to
program where the door will stop in the open (UP) and close
(DOWN) position. The electronic controls sense the amount of
force required to open and close the door. The force is adjusted
automatically when you program the travel.
NOTE: If anything interferes with the door's upward travel it will
stop. If anything interferes with the door's downward travel, it will
reverse.
UP (Open)
ONE-PIECE DOORS ONLY
When setting the UP travel for a one-piece door ensure that the
door does not slant backwards when fully open (UP). If the door
is slanted backwards this will cause unnecessary bucking and/or
jerking when the door is opening or closing.
PROGRAMMING BUTTONS
The programming buttons are located on the left side panel of the
garage door opener and are used to program the travel.
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED or
KILLED by a closing garage door.
• Incorrect adjustment of garage door travel limits will interfere
with proper operation of safety reversal system.
• NEVER use force adjustments to compensate for a binding or
sticking garage door.
• 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 floor.
To prevent damage to vehicles, be sure fully open door
provides adequate clearance.
DOWN (Close)
28
CORRECT
INCORRECT
PROGRAMMING BUTTONS
UP
Button
Adjustment
Button
DOWN
Button