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Chamberlain M75 - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1 196 www .chamberlaingroup.com GARAGE DOOR OPENER 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 Sy ...
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Chamberlain M75 - page 2
2 Introduction Pages 2-5 Safety symbol and signal word review ........................2 Preparing your garage door ........................................3 T ools needed ...............................................................3 Planning .....................................................................4 Carton inventory ................. ...
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Chamberlain M75 - page 3
3 Pliers Wire Cutters Claw Hammer Hack Saw Screwdriver Adjustable End Wrench Sockets 1/2" and 7/16" and Wrench Drill Tape Measure 2 1 Stepladder Pencil Drill Bits 3/16", 5/16" and 5/32" Carpenter’s Level T o prevent damage to garage door and opener: • AL W A YS disable locks before installing and operating the opener . ...
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Chamberlain M75 - page 4
Safety Reversing Sensor Support bracket & fastening hardware is required. See page 13. — — — — — — — — Door Center Header Wall FINISHED CEILING Torsion Spring Extension Spring OR Safety Reversing Sensor Gap between floor and bottom of door must not exceed 1/4" Access Door Wall- mounted Door Control Horizontal and vertical r ...
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Chamberlain M75 - page 5
5 Straight Door Arm Section Curved Door Arm Section Safety Labels and Literature Header Bracket U P C E IL IN G M O U N T O N L Y Sprocket Cover 2 Conductor Bell Wire White & White/Red Remote Control Transmitter Visor Clip Door Bracket (2) Safety Reversing Sensors (1 Sending Eye and 1 Receiving Eye) with 2-Conductor White & White/Black Bell ...
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Chamberlain M75 - page 6
6 ASSEMBL Y STEP 1 Attach the T -Rail to the Motor Unit T o avoid installation difficulties, do not run the garage door opener until instructed to do so. • Remove the two washered bolts mounted in top of motor unit. • Position T -rail at a 45 ˚ angle to opener so one hole in T -rail and motor unit line up. • Thread one of the washered bolts ...
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Chamberlain M75 - page 7
7 ASSEMBL Y STEP 3 Tighten the Chain • Spin the inner nut and lock washer down the threaded shaft, away from the trolley . • T o tighten the chain, turn outer nut in the direction shown. As you turn the nut, keep the chain from twisting. • When the chain is approximately 1/2" above the base of the T -rail at its midpoint, re-tighten the ...
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Chamberlain M75 - page 8
8 INST ALLA TION STEP 1 Determine the Header Bracket Location Installation procedures vary according to garage door types. Follow the instructions which apply to your door . SECTIONAL DOOR AND ONE-PIECE DOOR WITH TRACK 1. Close the door and mark the inside vertical centerline of the garage door . 2. Extend the line onto the header wall above the do ...
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Chamberlain M75 - page 9
9 Header Wall Vertical Centerline Vertical Centerline of Garage Door 2x4 Unfinished Ceiling 2x4 OPTIONAL CEILING MOUNT FOR HEADER BRACKET Structural Supports ONE-PIECE DOOR WITHOUT TRACK 1. Close the door and mark the inside vertical centerline of your garage door . Extend the line onto the header wall above door , as shown. If headroom clearance i ...
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Chamberlain M75 - page 10
10 INST ALLA TION STEP 2 Install the Header Bracket Y ou can attach the header bracket either to the wall above the garage door , or to the ceiling. Follow the instructions which will work best for your particular requirements. Do not install the header bracket over drywall. If installing into masonry , use concrete anchors (not provided). W ALL HE ...
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Chamberlain M75 - page 11
Clevis Pin 5/16"x2-3/4" Ring Fastener 11 INST ALLA TION STEP 3 Attach the T -Rail to the Header Bracket • P osition the opener on the garage floor below the header brac ket. Use packing material as a protective base . NO TE: If the door spring is in the wa y y ou’ll need help . Hav e someone hold the opener securely on a temporary sup ...
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Chamberlain M75 - page 12
12 ONE-PIECE DOOR WITHOUT TRA CK •W ith the door fully open and parallel to the floor , measure the distance from the floor to the top of the door . • Using a stepladder as a suppor t, raise the top of the opener to this height. • The top of the door should be le vel with the top of the motor unit. Do not position the opener more than 2" ...
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Chamberlain M75 - page 13
13 INST ALLA TION STEP 5 Hang the Opener Tw o representative installations are shown. Y ours ma y be different. Hanging brac kets should be angled (Figure 1) to provide rigid suppor t. On finished ceilings (Figure 2), attach a sturdy metal brac ket to structural suppor ts before installing the opener . This brac ket and f astening hardware are not ...
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Chamberlain M75 - page 14
Opener Terminal Screws Bell Wire Antenna BACK PANEL Lighted Door Control Button Terminal Screws Bell Wire WHT RED 1 3 9 7 5 1 3 9 7 5 2 3 1 -2 -1 Lighted Door Control Button 14 INST ALLA TION STEP 6 Install the Door Control Locate the door control within sight of the door at a minimum height of 5 f eet where small children cannot reach, and aw ay f ...
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Chamberlain M75 - page 15
15 INST ALLA TION STEP 7 Install the Light and Lens INST ALL THE LIGHT • Install a 75 watt maxim um light bulb in each soc ket. The light will tur n ON and remain lit f or appro ximately 4-1/2 minutes when power is connected. Then the light will tur n OFF . • If the b ulbs burn out prematurely due to vibration, replace with a Garage Door Opener ...
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Chamberlain M75 - page 16
16 INST ALLA TION STEP 9 Electrical Requirements To av oid installation difficulties, do not run the opener at this time. To reduce the risk of electr ic shock, y our garage door opener has a grounding type plug with a third g rounding pin. This plug will only fit into a grounding type outlet. If the plug doesn't fit into the outlet you hav e, ...
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Chamberlain M75 - page 17
17 Invisible Light Beam Protection Area Sensor Beam 6" max. above floor Sensor Beam 6" max. above floor F acing the door fr om inside the garage INST ALLA TION STEP 10 Install The Protector System ® The safety rever sing sensor must be connected and aligned correctly bef ore the garage door opener will move in the do wn direction. IMPORT ...
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Chamberlain M75 - page 18
18 FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) DOOR TRACK MOUNT (RIGHT SIDE) Indicator light Lens Lip Sensor Bracket Door T rack Sensor Bracket Extension Bracket (See Accessories) Lens Indicator light Attach with concrete anchors (not provided) Inside G arage W all Indicator light Sensor Bracket Lens Extension Bracket (See Accessories) Inside ...
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Chamberlain M75 - page 19
Carriage bolt 1/4"-20x1/2" Lens Wing nut Figure 4 MOUNTING AND WIRING THE SAFETY SENSORS • Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor . Use wing nuts to f asten sensors to brac kets, with lenses pointing to ward each other across the door . Be sure the lens is not obstr ucted by a brac ket e xtension. ...
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Chamberlain M75 - page 20
20 INST ALLA TION STEP 11 Fasten the Door Bracket F ollow instructions which apply to your door type as illustrated below or on the f ollowing page . A horizontal reinfor cement brace should be long enough to be secured to two or three vertical supports. A vertical reinfor cement brace should cover the height of the top panel. Figure 1 shows one pi ...
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Chamberlain M75 - page 21
21 Header Wall Vertical Centerline of Garage Door Finished Ceiling Optional Placement of Door Bracket Header Bracket Door Bracket 2x4 Support For a door with no exposed framing, or for the optional installation, use lag screws 5/16"x1-1/2" (Not provided) to fasten door bracket. MET AL DOOR Top of Door (Inside Garage) Door Bracket Optional ...
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Chamberlain M75 - page 22
22 INST ALLA TION STEP 12 Connect Door Arm to T rolley Follow instructions which apply to your door type as illustrated below and on the following page. SECTIONAL DOORS ONL Y • Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley . Slide the outer trolley back (away from t ...
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Chamberlain M75 - page 23
23 ALL ONE-PIECE DOORS 1. Assemble the door arm: • Fasten the straight and curved door arm sections together to the longest possible length (with a 2 or 3 hole overlap). • With the door closed, connect the straight door arm section to the door bracket with the 5/16"x1-1/4" clevis pin. • Secure with a ring fastener . 2. Adjustment pr ...
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Chamberlain M75 - page 24
24 ADJUSTMENT STEP 1 Adjust the UP and DOWN T ravel Limits Limit adjustment settings regulate the points at which the door will stop when moving up or down. T o operate the opener , press the Door Control push bar/button. Run the opener through a complete travel cycle. • Does the door open and close completely? • Does the door stay closed and n ...
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Chamberlain M75 - page 25
25 ADJUSTMENT STEP 2 Adjust the Force Force adjustment controls are located on the back panel of the motor unit. Force adjustment settings regulate the amount of power required to open and close the door . If the forces are set too light, door travel may be interrupted by nuisance reversals in the down direction and stops in the up direction. Weath ...
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Chamberlain M75 - page 26
26 Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSL Y INJURED or KILLED by a closing garage door . • Safety reversal system MUST be tested every month. • If one control (for ce or travel limits) is adjusted, the other control may also need adjustment. • After ANY adjustments are made ...
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Chamberlain M75 - page 27
OPERA TION IMPORT ANT SAFETY INSTRUCTIONS T o reduce the risk of severe injury or death: Using Y our Garage Door Opener Y our Security ✚ opener and hand-held remote control have been factory-set to a matching code which changes with each use, randomly accessing over 100 billion new codes. Y our opener will operate with up to eight Security ✚ re ...
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Chamberlain M75 - page 28
28 T o Open the Door Manually The door should be fully closed if possible. Pull down on the emergency release handle and lift the door manually . T o reconnect the door to the opener , press the door control push bar . The lockout feature prevents the trolley from reconnecting automatically , Pull the emergency release handle down and back (toward ...
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Chamberlain M75 - page 29
29 Care of Y our Opener LIMIT AND FORCE ADJUSTMENTS: Weather conditions may cause some minor changes in door operation requiring some readjustments, particularly during the first year of operation. Pages 24 and 25 refer to the limit and force adjustments. Only a screwdriver is required. Follow the instructions carefully . Repeat the safety reverse ...
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Chamberlain M75 - page 30
30 Having a Problem? (Continued) 6. The garage door opens and closes by itself: • Be sure that all remote control push buttons are off. • Remove the bell wire from the door control terminals and operate from the remote only . If this solves the problem, the door control is faulty (replace), or there is an intermittent short on the wire between ...
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Chamberlain M75 - page 31
*3-Button Remotes If provided with your garage door opener , the large button is factory programmed to operate it. Additional buttons on any Security ✚ ® 3-Button remote or mini-remote can be programmed to operate other Security ✚ ® garage door openers. T o Erase All Codes From Motor Unit Memory T o deactivate any unwanted remote, first erase ...
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Chamberlain M75 - page 32
1. Enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold ENTER. 2. While holding the ENTER button, press and hold the LIGHT button on the Multi-Function Door Control. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the Multi-Function Door Control (all three buttons ...
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Chamberlain M75 - page 33
7 U P C E I L I N G M O U N T O N L Y 11 10 NOTICE 5 6 8 1 4 9 12 3 2 1 3 4 5 RAIL GREASE NO. 83A11-2 6 2 Installation Parts 33 REP AIR P ARTS Rail Assembly Parts KEY P ART NO . NO . DESCRIPTION 1 4A1008 Master link kit 2 41A4813 Chain pulley bracket 3 41A3489 Complete trolley assembly 4 183B99 One-piece T -rail 5 41D3484 Full chain assembly 6 83A1 ...
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Chamberlain M75 - page 34
Motor Unit Assembly Parts 34 2 1 10 8 13 14 15 16 19 4 3 DN UP Brown Wire (Down) Contact LIMIT SWITCH ASSY. Grey Wire Yellow Wire (Up) Contact Center Limit Contact Drive Gear 9 20 16 12 18 11 17 3 5 6 7 KEY P ART NO . NO . DESCRIPTION 1 31D380 Sprocket cover 2 41C4220A Gear and sprocket assembly . Complete with: Spring washer , thrust washer , reta ...
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Chamberlain M75 - page 35
LOCK LIGHT 35 ACCESSORIES 974AC 970LM 971AC 1708LM 97LM 1702LM Outside Quick Release: Required for a garage with NO access door . 8 Foot Complete Rail: T o allow an 8 foot door to open fully . 1-Button SECURITY ✚ ® Remote Control: Includes visor clip. 3-Button SECURITY ✚ ® Remote Control: Includes visor clip. 4-Button SECURITY ✚ ® Remote C ...
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Chamberlain M75 - page 36
© 2003, The Chamberlain Group, Inc. 1 14A2670C All Rights Reserved Printed in Mexico A CCESS MASTER GARA GE DOOR OPENER ONE-YEAR LIMITED W ARRANTY Chamberlain/Access Master (“Seller”) warrants, to the first retail purchaser of this product, for the residence in which this product is originally installed, that it will be free from any defect in ...
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