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Chamberlain 1280-298LMC - page 1
TM Garage Door Opener Model 1280-298LMC - 1/2 HP - For Residential Use Only ® Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ The door WILL NOT CLOSE unless the Protector System ® is connected and properly aligned. ■ Periodic checks o ...
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Chamberlain 1280-298LMC - page 2
Start by reviewing these important safety alert symbols 2 CONTENTS PAGE A review of safety alert symbols ...............................2 You'll need tools ........................................................3 Safety information regarding garage door locks and ropes ...............................................................3 Testing y ...
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Chamberlain 1280-298LMC - page 3
Pliers Wire Cutters Claw Hammer Hack Saw Screwdriver Adjustable End Wrench 1/2" and 7/16" Sockets and Wrench Drill Tape Measure 2 1 Stepladder Pencil 3/16", 5/16" and 5/32" Drill Bits Carpenter's Level Y ou'll Need T ools During assembly , installation and adjustment of the opener , instructions will call for hand ...
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Chamberlain 1280-298LMC - page 4
4 Safety Reversing Sensor Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 20 for details. FINISHED CEILING Support bracket & fastening hardware is required. See page 13. — — — — — — — — Door Center Header Wall Safety Reversing Sens ...
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Chamberlain 1280-298LMC - page 5
5 Straight Door Arm Section Curved Door Arm Section Safety Labels and Literature Header Bracket UP CEILING MOUNT ONLY 2-Conductor Bell Wire White & White/Red Remote Control Transmitter Visor Clip Light Lens (2) Belt Cap Retainer Door Bracket One-Piece T-rail Styrofoam Belt Pulley Bracket Belt Trolley SECURITY ✚ 3-Channel Remote Control (2) (2 ...
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Chamberlain 1280-298LMC - page 6
ASSEMBL Y STEP 1 Attach the T -Rail T o the Opener To fasten rail, use only those screws mounted in the top of the opener. Any other screws will cause serious damage to the opener. 6 • Remove the two washered screws mounted in top of opener. • Align T-rail and styrofoam over opener sprocket. • Cut tape from T-rail, belt and styrofoam. • REM ...
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Chamberlain 1280-298LMC - page 7
Assembly Step 3 Attach the Belt Cap Retainer 7 IMPORT ANT INST ALLA TION INSTRUCTIONS T o reduce the risk of severe injury or death to persons: 1. READ AND FOLLOW ALL INST ALLA TION INSTRUCTIONS. 2. Install only on a properly balanced and lubricated garage door. An improperly balanced door may not reverse and could result in severe injury or death. ...
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Chamberlain 1280-298LMC - page 8
• Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on the header wall 2" above the high point. This height will provide travel clearance for the top edge of the door. Header Wall Ceiling Track Highest Point of Travel Door 2" 8 Proceed to Step 2, page 10. Door Track Header Wall Highest Point of ...
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Chamberlain 1280-298LMC - page 9
9 Header Wall Vertical Centerline Vertical Centerline of Garage Door 2x4 Unfinished Ceiling Structural Supports 2x4 OPTIONAL CEILING MOUNT • Close the door and mark the inside vertical centerline of your garage door. Extend the line onto the header wall above door. If headroom clearance is minimal, you can install the header bracket on the ceilin ...
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Chamberlain 1280-298LMC - page 10
UP Lag Screws 5/16"-9x1-5/8" Garage Door Vertical Center Line Header Wall Finished Ceiling Header Bracket 6" Maximum Vertical Center Line Door Spring Lag Screws 5/16"-9x1-5/8" Highest Point of Travel (of Garage Door) Vertical Center Line Header Wall Garage Door UP CEILING MOUNT ONLY Wall Mounting Holes Optional Wall Mountin ...
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Chamberlain 1280-298LMC - page 11
Header Bracket Belt Pulley Bracket Temporary Support Header Wall Garage Door , Liftmaster Synchro Drive Tee Rail to Header Bracket 5/16/92 T-rail Clevis Pin 5/16"x2-3/4 " Ring Fastener Header Bracket Belt Pulley Bracket T-rail • Position the opener on the garage floor below the header bracket. Use packing material as a protective base. ...
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Chamberlain 1280-298LMC - page 12
Installation Step 4 Position the Opener Follow instructions which apply to your door type as illustrated. To prevent damage to steel, aluminum, fiberglass or glass panel doors, do not rest the opener on the door without using a 2x4. SECTIONAL Door & ONE-PIECE Door with T rack T-rail 2x4 Laid Flat Door Stepladder ONE-PIECE Door without T rack ? ...
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Chamberlain 1280-298LMC - page 13
Installation Step 5 Hang the Opener Two representative installations are shown. Yours may be different. Hanging brackets should be angled, Figure 1, to provide rigid support. On finished ceilings, Figure 2, attach a sturdy metal bracket to structural supports before installing the opener. The bracket and fastening hardware are not supplied. • Mea ...
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Chamberlain 1280-298LMC - page 14
Outside Keylock Accessory Connections To opener terminal screws: white to 2; white/red to 1 WARNING DO NOT CONNECT TO LIVE ELECTRICAL WIRING. CONNECT ONLY TO 24 VOLT LOW VOLTAGE WIRES. CONNECTION TO LIVE WIRES OR HIGHER VOLTAGE MAY CAUSE SERIOUS INJURY FROM SHOCK, BURN OR ELECTROCUTION. Children operating or playing with a garage door opener can in ...
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Chamberlain 1280-298LMC - page 15
Watt x imum h t Bulb Lens Guide e ns a b Lens Slot Lens Tab 75 Watt Maximum Light Bulb • Install a 75 watt maximum light bulb in the socket. The light will turn ON and remain lit for approximately 4-1/2 minutes when power is connected. Then the light will turn OFF. • If the bulbs burn out prematurely due to vibration, replace with a "Garag ...
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Chamberlain 1280-298LMC - page 16
To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn't fit into the outlet you have, contact a qualified electrician to install the proper outlet. To avoid installation difficulties, do not run the opener at th ...
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Chamberlain 1280-298LMC - page 17
Without a properly working safety reversing sensor , persons (particularly children) could be injured or killed by a closing garage door . Read and follow all instructions. T o protect small children, install the safety reversing sensor so that the beam will be no higher than 4"-6" above the garage floor . Disconnect power to the garage d ...
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Chamberlain 1280-298LMC - page 18
Installation Step 10 Install the Safety Reversing Sensor 18 FLOOR MOUNT (Right Side) WALL MOUNT (Right Side) DOOR TRACK MOUNT (Right Side) Indicator light Lens Lip Sensor Brack et Door T rac k Sensor Brack et Optional Extension Bracket (See Accessories) Lens Indicator light Attach with concrete anchors (not provided) Inside Garage Wall Indicator li ...
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Chamberlain 1280-298LMC - page 19
Invisible Light Beam Protection Area Sensor Sensor Connect Wire to Opener Terminals Bell Wire Bell Wire Finished Ceiling OPENER TERMINAL SCREWS Sensor Connections Door Control Connections (dotted line) 1 2 3 19 Figure 6 Wiring the Safety Sensors 1/4"-20x1/2" Carriage bolt Lens Wing nut Figure 5 MOUNTING AND WIRING THE SAFETY SENSORS • S ...
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Chamberlain 1280-298LMC - page 20
Installation Step 1 1 Fasten Door Bracket Follow instructions which apply to your door type as illustrated below or on page 21. T o prevent damage to steel, aluminum, fiberglass or glass panel doors, always reinforce the inside of the door both vertically and horizontally with angle iron. A horizontal brace should be long enough to be secured to 2 ...
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Chamberlain 1280-298LMC - page 21
Door Bracket Inside Edge of Door or Reinforcement Board Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, aluminum, steel, door with glass panel, etc.). (Not Provided) Header Wall Vertical Centerline of Garage Door — Finished Ceiling — Header Bracket 2x4 Support Door Bracket All ONE-PIECE Door Installatio ...
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Chamberlain 1280-298LMC - page 22
Installation Step 12 Connect Door Arm to Trolley Follow instructions which apply to your door type as illustrated below and on page 23. Make sure garage door is fully closed. Pull the manual release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" as shown in Figures 1, 2 ...
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Chamberlain 1280-298LMC - page 23
Nuts 5/16"-18 Lock Washers 5/16" Ring Fastener Straight Door Arm Screws 5/16"-18x7/8" Door Bracket 5/16"x1-1/4" Clevis Pin Curved Door Arm Fully Open Trolley Door Arm Connector Hole Door Arm Closed Door Open Door Door with Backward Slant Door Arm Connector Hole Fully Closed Trolley Door Arm Can/DoorArmToTrolley 1 pc Al ...
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Chamberlain 1280-298LMC - page 24
Adjustment Step 1 Adjust the UP and DOWN Limits Do not make any limit adjustments until the safety reversing sensors are completely installed. 24 Limit adjustment settings regulate the points at which the door will stop when moving up or down. The door will stop in the up direction if anything interferes with door travel. The door will reverse in t ...
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Chamberlain 1280-298LMC - page 25
Adjustment Step 2 Adjust the Force Too much force on the door will interfere with the proper operation of the safety reverse system. The door might not reverse properly when required and could seriously injure or kill someone under it. Do not increase the force beyond the minimum amount required to close the door. Do not use the force adjustments t ...
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Chamberlain 1280-298LMC - page 26
Adjustment Step 4 T est the Safety Reverse System Test: • With the door fully open, 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 directio ...
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Chamberlain 1280-298LMC - page 27
The remote control transmitter: The opener must learn the code of any new remote control. Page 29 explains how to program your receiver and how to erase all codes if required. Self service of your radio controls and remote controls is not recommended. If service is needed, call the toll- free number listed on the back page. The remote control batte ...
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Chamberlain 1280-298LMC - page 28
28 Operation of Y our Opener Weak or broken springs could allow an open door to fall (either rapidly or unexpectedly), resulting in serious injury, death or property damage. If possible, use the manual release rope and handle only when the door is fully closed. WARN ING Activate the opener with any of the following: • The Remote Control Transmitt ...
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Chamberlain 1280-298LMC - page 29
SECURITY ✚ Garage Door Opener RIGHT PANEL "Smart" (learn) Button Indicator Light KG KG 1 3 9 7 5 1 3 9 7 5 1 2 3 KG KG 1 3 9 7 5 1 3 9 7 5 1 2 3 Code programming instructions are also located on the opener panel. Figure 2 Select a push button Model 973LM SECURITY ✚ 3-Channel Remote Control Figure 1 Children operating or playing with a ...
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Chamberlain 1280-298LMC - page 30
1. Does the opener have electric power? Plug a lamp into the outlet. If it doesn't light, check the fuse box or the circuit breaker. (Some outlets are controlled by a wall switch.) 2. Have you disabled all door locks? Review installation instruction warnings on page 7. 3. Is there a build-up of ice or snow under the door? The door may be froze ...
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Chamberlain 1280-298LMC - page 31
31 Having a Problem? (continued) Situation Probable Cause & Solution The door reverses for no apparent reason and opener lights don't blink: 1. Is something obstructing the door? Pull the manual release handle. Operate the door manually. If it is unbalanced or binding, call for professional garage door service. 2. Clear any ice or snow fro ...
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Chamberlain 1280-298LMC - page 32
7 10 11 5 NOTICE 6 UP CEILING MOUNT ONLY 8 4 3 2 9 12 1 LOCK LIGHT 7 1 4 5 3 6 2 Rail Assembly Parts Installation Parts 32 KEY PART NO. NO. DESCRIPTION 1 1A995 Master link kit 2 41A3588-1 Belt pulley bracket 3 41B3869-1 Complete trolley assembly 4 183B99 One-piece T-rail 5 41A3589-12 Full belt assembly 6 41B4103 Tensioner assembly 7 109B33 Trolley ...
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Chamberlain 1280-298LMC - page 33
Repair Parts Opener Assembly Parts 2 12 10 15 4 3 DN UP Brown Wire (Down) Contact LIMIT SWITCH ASSY. Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear 11 5 6 7 9 8 9 8 20 14 13 16 1 3 18 19 17 5 KEY P ART NO. NO. DESCRIPTION 1 41A4371 Belt cap retainer 2 41A4885-2 Gear and sprocket assembly Complete with: Spring washer Thrust washe ...
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Chamberlain 1280-298LMC - page 34
LOCK LIGHT 34 Accessories A vailable For Y our Opener Model 59LMC Model 974LMC Model 1702LMC SECURITY ✚ 3-Channel Remote Control: Includes visor clip. SECURITY ✚ 4-Channel Remote Control: Includes visor clip. SECURITY ✚ 3-Channel Mini Remote Control: With key ring and V elco fastening strip. Extension Brakcets: (Optional) For safety sensor in ...
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Chamberlain 1280-298LMC - page 35
Index Access Door/Outside Quick Release Accessory ..........................................................................................4, 34 Electrical Safety Warnings ....................................................................................................................2, 7, 16, 27 Garage Door Testing for balance, binding and sti ...
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Chamberlain 1280-298LMC - page 36
© 2000, The Chamberlain Group, Inc. 114A2478 All Rights Reserved Printed in Mexico LIFT -MASTER SERVICE IS ON CALL OUR LARGE SERVICE ORGANIZATION SPANS AMERICA AND CANADA INSTALLATION AND SERVICE INFORMATION IS AS NEAR AS YOUR TELEPHONE SIX DAYS A WEEK. SIMPLY DIAL OUR TOLL FREE NUMBER: 1-800-654-4736 HOURS: (Central Std. Time) 6:00 A.M. TO 7:00 P ...
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