Chamberlain 1280 - 1/2 HP User Manual Page 1

TMThe Chamberlain Group, Inc.A DUCHOSSOIS ENTERPRISE845 Larch AvenueElmhurst, Illinois 60126-1196Garage Door OpenerOWNER'S MANUALModel 1280- 1/2

Lag Screws5/16"x9x1-5/8"HighestPoint of Travel(of Garage Door)VerticalCenterLineHeaderWallGarageDoorMounting New Header Bracket10/

HeaderBracketBelt PulleyBracketTemporarySupportHeader WallGarageDoorThe Chamberlain Group, Inc.Liftmaster Synchro DriveAttach Tee Rail to Header

Installation Step 4Position the OpenerFollow instructions which apply to your doortype as illustrated.To prevent damage to steel, aluminum,fiberglass

Installation Step 5Hang the OpenerTwo representative installations are shown.Yours may be different. Hanging brackets shouldbe angled, Figure 1, to pr

OpenerTerminal ScrewsAntennaRight Panelof OpenerMulti-FunctionDoor Control PanelMulti-FunctionDoor Control PanelTerminal ScrewsWHITEREDThe Chamberlain

• Install a 75 watt maximum light bulb in eachsocket. The lights will turn ON and remain lit forapproximately 4-1/2 minutes when power isconnected. Th

To reduce the risk of electric shock, your garagedoor opener has a grounding type plug with a thirdgrounding pin. This plug will onlyfit into a ground

The safety reversing sensor mustbe connectedand aligned correctly before the garage dooropener will move in the down direction. This is arequired safe

1/4 x 1-1/2"Lag Screw#10 - 32 x 3/8"Screw1/4" - 20Lock Nut#10 x 32Lock NutStaples1/4" - 20 x 1/2"Carriage BoltsInstal

Invisible Light BeamProtection AreaSensorSensorConnect Wire toOpener TerminalsThe Chamberlain Group, Inc.Attaching Sensor to "C" Wrap and

Start by reviewing these important safety alert symbols2Contents PageA review of safety alert symbols...2Safety information

Installation Step 11Fasten Door Bracket Follow instructions which apply to your doortype as illustrated below or on page 21.To prevent damage to steel

Horizontal and verticalreinforcement is needed forlightweight garage doors(fiberglass, aluminum, steel, door with glass panel, etc.).Header WallVe

Installation Step 12 Connect Door Arm to TrolleyFollow instructions which apply to your doortype as illustrated below and on page 23.Make sure garage

All ONE-PIECE DoorsAssemble the Door Arm:• Fasten the straight and curved door arm sectionstogether to the longest possible length (with a 2 or3 hole

Adjustment Step 1Adjust the UP and DOWN LimitsDo not make any limit adjustments until theSafety Reversing Sensors are completelyinstalled.24Limit adju

Adjustment Step 2Adjust the ForceToo much force on the door will interfere with theproper operation of the safety reverse system.The door might not re

Adjustment Step 4Test the Safety Reverse SystemTest• Place a one-inch board (or a 2x4 laid flat) on thefloor, centered under the garage door.• Operate

The remote control transmitterThe opener must learn the code of any new remotecontrol. Page 29 explains how to program yourreceiver and how to erase a

To open the doormanually:The door should be fullyclosed if possible. Pulldown on the manualrelease handle and lift thedoor manually. Toreconnect the d

Children operating or playing with a garagedoor opener can injure themselves or others.The garage door could close and causeserious injury or death.Do

3SECTIONAL DOORONE-PIECE DOORTo avoid damage to the garage door andopener, disable locks before installing andoperating the opener. Use a wood screw o

Having a Problem?Situation Probable Cause & SolutionThe opener doesn'toperate from eitherthe door control orthe remote control:Opener operate

Having a Problem? (continued)Situation Probable Cause & SolutionThe door reverses forno apparent reasonand opener lightsdon't blink:The door

10UPCEILING MOUNT ONLY713121112VDC25NOTICE6983LIGHTLOCK11415164215637RAIL GREASENO. 83A484Rail Assembly PartsInstallation Parts32KEY PARTNO. NO. DESCR

Repair PartsOpener Assembly Parts212101543DNUPBrownWire(Down)ContactLIMIT SWITCH ASSY.GreyWireYellowWire(Up)ContactCenter LimitContactDriveGear1156798

Accessories Available For Your OpenerModel 83LMModel 742LMModel 84LMModel 60Model 66LMModel 17023-Channel Remote Control:Includes visor clip.4-Channel

IndexAccess Door/Outside Quick Release Accessory...31, 34Electric

© 1996, The Chamberlain Group, Inc.114A1945D-xxx All Rights Reserved Printed in Mexico LIFT-MASTER SERVICE ISON CALLOUR LARGE SERVICE ORGANIZATIONSPA

4You may find it helpful to refer back to this page as you proceed with the installation of your opener.Safety Reversing SensorHorizontal and vertical

5Straight DoorArm SectionDoor Bracket Plate Door BracketCurved DoorArm SectionSafety LabelsandLiteratureHeader BracketUPCEILING MOUNT ONLYSafety Rever

ASSEMBLY STEP 1Attach the T-Rail To the OpenerTo fasten rail, use only those screws mountedin the top of the opener. Any other screws willcause serio

ASSEMBLY STEP 3Attach the Belt Cap Retainer7IMPORTANT INSTALLATION INSTRUCTIONSTo reduce the risk of severe injury or death to persons:1. READ AND FO

• Open your door to the highestpoint of travel as shown. Drawan intersecting horizontal lineon the header wall 2" abovethe high point. This heigh

Header WallVerticalCenterlineVerticalCenterline ofGarage Door2x4UnfinishedCeilingStructural Supports2x4Header SupportOPTIONAL CEILING MOUNTFOR H