Adjustment; Adjustment Introduction - Craftsman 139.30437 Owner's Manual

A/igning the Safety Reversing Sensors (Continued)
IF THE AMBERLED ON THE SENDINGSENSORIS NOT
GLOWING:
1. Make sure there is power to the garage door opener.
2. Make sure the sensor wire is not shorted/broken.
3. Make sure the sensor has been wired correctly: white wires to
white terminal and white/black wires to grey terminal.
IF THE GREENLED ONTHE RECEIVING SENSORIS NOT
GLOWING:
1. Make sure the sensor wire is not shorted/broken.
2. Make sure the sensors are aligned.
ADJUSTMENT
Introduction
Your garage door opener is designedwith 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 and cannot be
changed.
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)
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLYINJUREDor
KILLEDby a closing garage door.
• Incorrect adjustment of garage door travel limits will interfere
with proper operation of safety reversal system.
• NEVERuse 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 adequateclearance.
ONE-PIECEDOORSONLY
When setting the UPtravel 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.
PROGRAMMINGBUTTONS
The programming buttons are located on the left side panel of the
garage door opener and are used to program the travel.
PROGRAMMING BUTTONS
o o o
UP
j Button
Adjustment
Button
DOWN
Button
27