Chamberlain LiftMaster PROFESSIONAL SECURITY+ 1280LMC-R Manuel Du Propriétaire page 3

Preparing your garage door
Before you begin:
• Disable locks.
• Remove any ropes connected to garage door.
• Complete the following test to make sure your
garage door is balanced and is not sticking or
binding:
1. Lift the door about halfway as shown. Release
the door. If balanced, it should stay in place,
supported entirely by its springs.
2. Raise and lower the door to see if there is any
binding or sticking.
If your door binds, sticks, or is out of balance, call
a trained door systems technician.
Sectional Door
Stepladder
One-Piece Door
Carpenter's
Level
Tape Measure
Drill
3/16", 5/16" and
5/32" Drill Bits
1/2" and 7/16" Sockets
and Wrench
WARNING
To prevent possible SERIOUS INJURY OR DEATH:
• ALWAYS call a trained door systems technician if
CAUTION
garage door binds, sticks, or is out of balance. An
unbalanced garage door may not reverse when
required.
• NEVER try to loosen, move or adjust garage door, door
springs, cables, pulleys, brackets or their hardware, all
of which are under EXTREME tension.
• Disable ALL locks and remove ALL ropes connected to
garage door BEFORE installing and operating garage
WARNING
door opener to avoid entanglement.
CAUTION
To prevent damage to garage door and opener:
• ALWAYS disable locks before installing and operating
the opener.
• ONLY operate garage door opener at 120V, 60 Hz to
avoid malfunction and damage.
Tools needed
During assembly, installation and adjustment of the
opener, instructions will call for hand tools as
illustrated below.
Pencil
Wire Cutters
Pliers
Screwdriver
3
Hack Saw
Claw Hammer
Adjustable End Wrench