LiftMaster LA400 Support Question
LiftMaster LA400 Support Question
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Question posted by Jimcooley on July 26th, 2020
Antenna Issues On La400
My antenna seems to have issues. I could previously be 70-80 ft away and remotely open the gate. Now I need to be 5-6 ft away and have direct line of sight to the control box. I tried tightening the coax connector. It's secure and not corroded. Do I need to replace the entire motherboard or is there another option? I've had this for 8-10yrs
Current Answers
Answer #1: Posted by Jimcooley on August 2nd, 2020 12:04 PM
Jimcooley
Member since:
July 26th, 2020 Points: 50
Member since:
July 26th, 2020 Points: 50
I fixed my issue. I replaced the top antenna with a $10 aftermarket replacement one from amazon. Works great. I probably should have removed, sanded, and reseated it before replacing...but the new one works fine. I'm guessing it was a loose connection on top.
Antenna with Coaxial Connection F Connector for use with Gate receiver 8" long and a protective rubber, Silver, 8 Inch https://www.amazon.com/dp/B00IJ2TRO6/ref=cm_sw_r_cp_api_i_0RWjFbAGEN6WZ
Related LiftMaster LA400 Manual Pages
LA400 Manual - Page 1
The operator can be used in Class I, Class II and Class III applications.
2 YEAR WARRANTY
Radio Receiver Built on Board
315 MHz LA400 & LA400-S
MEDIUM DUTY SWING GATE OPERATOR
OWNER'S MANUAL
MeBtOoLaaxplrtC(giXooennLMatrl)ol
Serial # Primary Arm Serial # Secondary Arm Serial # Control Box Installation Date
The LA400 is intended for use with vehicular swing gates.
LA400 Manual - Page 2
...-to-Open) Attach Brackets to Gate Operator Determine Mounting Location Measuring and Marking for the Gate Bracket Position Gate Operator on Gate Test Gate Travel Secure Post Bracket to Gate Post Secure Gate Bracket to Gate Warning Sign Placement Standard Control Box Large Metal Control Box (XLM)
WIRING
Connect the Gate Operator (Gate 1) to the Control Box Set the Bipart Delay (Model LA400-S Only...
LA400 Manual - Page 8
... inventory is doubled except for a 90° opening 4 Minutes -20° C to + 50° C -4° F to -Open Bracket (1) • Hex Bolt 5/16"-18 ...control box.
• Standard Control Box (1) • Hardware Bag (1) • Gate Operator Arm • Motor Cable - Six Conductor, 9 feet (2.7 m) • Warning Sign (2) • Battery (2) • Plug-in Transformer (1)
LA400-S (SECOND GATE...
LA400 Manual - Page 10
...Ground Installation (Optional)
9 INSTALLATION » OVERVIEW OF TYPICAL INSTALLATION
LEFT-HAND GATE
Warning Sign
Antenna Control Box with Batteries
Photoelectric Sensors
12 Gauge Wire
PVC Conduit (not provided) to ...HAND GATE
NOTE: One or more non-contact sensors shall be exercised to reduce the risk of entrapment or obstruction exists at either the opening or closing direction.
LA400 Manual - Page 11
... from lawn mowers and string trimmers. INSTALLATION » OVERVIEW OF TYPICAL INSTALLATION
DUAL GATE
Warning Sign Hinge
Antenna
Post Bracket
Gate Bracket
Gate 1
Control Box with Batteries
Operator Cable
Gate 2
Junction Box Extension Cable Photoelectric Sensors
PVC Conduit (not provided) to reduce the risk of entrapment or obstruction exists at either the opening or closing direction.
LA400 Manual - Page 19
... Button Connections
Knock Outs
Knock Outs
Knock Outs
7
A. Mount the control box as high as possible for best radio reception.
1 Remove screws and open the control box.
1
2 Disconnect the reset button, alarm, and coaxial connector.
3 Loosen screws to remove the control board and mounting bracket.
4 Remove the control board.
5 Remove batteries and set aside.
6 Select mounting holes and...
LA400 Manual - Page 20
INSTALLATION » STANDARD CONTROL BOX
INSTALL THE CONTROL BOARD
NOTE: Make sure the battery leads are on the left side of the control box and not pinched.
1 Attach the antenna. 2 Reinstall the batteries, control board, alarm and reset button.
1 2
Coaxial Connector
Reset Button Connections Alarm
19
LA400 Manual - Page 21
...
RESET
STOP CTRL PWR CTRL PWR
SHADOW
INTERRUPT CHGR OVLD CTRL PWR
AC PWR /SOLAR
LOOP INPUTS
20 The control box door may be removed by opening the
door 90°. Lift
the
door
from
the
hinges
and ALARM LOCK GATE 1
setSOL
GND MAGR
LEARN XMITTER
ON
OFF
LOCK /
BIPA RT DELAY
BR
GR
WH
YL
BL...
LA400 Manual - Page 22
... bottom of the receptacles is for the standard control box. ALARM
LOCK
SOL GND MAGR
GATE 1 BR GR WH YL BL RD
ACCESSORY POWER
12 V
BR GR WH YL BL RD GATE 2
LEARN XMITTER
ON
OFF
LOCK /
BIPA RT DELAY
CLOSE EDGE
OPEN EDGE/ PHOTO
OPEN PHOTO
SET OPEN LIMIT
GATE 1
CLOSE PHOTO
SET CLOSE LIMIT
LEARN LIMITS...
LA400 Manual - Page 23
...
WHT
YEL
BLU
RED
Z12
ACCESSORY POWER
GATE 1
BRN
GRN
WHT U4
YEL
BLU
RED
3
MAX
C13
C4
F6 F2
FUSE OPEN
Nut
52
Operator Cable
1 Watertight Connector Nut
Terminal blocks can be used for the operator cable. 2 Insert the watertight connector into the bottom of the control box and tighten
with nut.
3 Insert the operator cable...
LA400 Manual - Page 24
... to the Gate 2 connector and
1
the operator on that the
control box be set as this gate. The range is 0 to open first and close second. WIRING » SET THE BIPART DELAY (MODEL LA400-S ONLY)
SET THE BIPART DELAY (MODEL LA400-S ONLY)
In some dual gate installations, one gate or if using a
solenoid lock, for the control box, then mount the control box on...
LA400 Manual - Page 25
...BLU RED
GATE 2
BRN GRN WHT YEL BLU RED
2
Operator Cable
4
Extension Cable
PVC Conduit
24 WIRING » CONNECT THE GATE OPERATOR (GATE 2) TO THE CONTROL BOX (MODEL LA400-S ONLY)
CONNECT THE GATE OPERATOR (GATE 2) TO THE CONTROL BOX (MODEL LA400-S ONLY) Before digging, contact local underground utility locating companies.
1 Trench across driveway to control box using watertight connector nut...
LA400 Manual - Page 28
... 120 Vac directly to the control box and plug the transformer into a receptacle external to the control box.
2 Run low voltage wire between the transformer and control box.
Serve 1
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
Off
Off Off Off
Off
Off
Off
Off
Air (1) Conditioner
Main Room
LA400
Bathroon. NOTE...
LA400 Manual - Page 29
...to the screw terminal of power for the operator.
ALARM MAGLOCK
Z1 GATE 1
ACCESSORY POWER
GATE 2 R4
J4
FUSE FUOSPEEN OPEN
D15 C2
MOV2
Control Box
R4 C2 J4
24 VAC/ SOLAR INPUT
Ground Screw
12 Gauge Wire
... green screw on the control board.
24 VAC/ INPUT
J4
MOV2
POWER C2
C64 U2
BATT 2 BATT 1
USE DEDICATED CIRCUIT
1
BATT 1 BATT 1 Connector
BATT 2 Connector
28 Ensure the power ...
LA400 Manual - Page 31
... on the outside of the control box to the desired OPEN position. The programming times-out automatically after 60 seconds of the gate the control box is now complete. (If the SET OPEN LIMIT LED continues to the desired OPEN position. SINGLE ARM LEFT-HAND SIDE
PROGRAM OPEN
3 Press the LEARN LIMITS button (SET OPEN LIMIT LED will beep. RESET...
LA400 Manual - Page 38
...LA400-BOX to open.
Upon removing the obstruction, the gate will continue to enclose safety electronics.
ADDITIONAL FEATURES » LOOP INPUTS + PHOTO/EDGE INPUTS (P6-7-8 AND 9)
LOOP INPUTS
OPEN ... INPUT TERMINAL AND COMMON This input protects cars by preventing the gate from moving off of the open control. If a Chamberlain Pulsing Photoelectric Sensor (See Accessories) has been...
LA400 Manual - Page 39
... DB1
C64 U2
R9 D1
JMPR1
D4 D2
FUSE OPEN
BATT 2 BATT 1
Accessory Power
AUXILIARY OUTPUT POWER ...gates. These devices have been provided for 2 inch (5 cm) square post. MODEL CPS-LN4 CPS-RN4
MODEL G65MG0204 G65MG0205 G65MGR205 G65MGS205
PHOTOELECTRIC CONTROLS DESCRIPTION
Emitter, receiver and mounting brackets - 30 feet (9 m) Ranges
VOLTAGE +24 Vdc
Emitter with the LA400 to control box...
LA400 Manual - Page 42
...1
Connector P1
2
Connector P6
3
Connector P8
4
Connector P7
5
Connector P9
6
Connector P12
7
Connector P10
8
Connector P11
9
Connector P5
10
Connector P16
11
Connector P13
12
Connector P17
13
Connector P14
FUNCTION
Antenna Input Close Edge Open Edge/Photo Open Photo Close Photo Switched Accessory Power* Control Inputs Loop Inputs 24 Vac Input Gate 2 Accessory Power* Gate...
LA400 Manual - Page 45
...
Switch Harness
3 41ASWG-0014SA
Rear Connector
1
4 41ASWG-489
Cable 24 V with Connector
1
Not Shown
41ASWG-0119
Release Key
1
K77-19130
Hardware Bag Complete with: Gate bracket, post bracket, Pull-to the parts lists below for replacement parts available for your operator. REPAIR PARTS » CONTROL BOX + GATE OPERATOR ARM
CONTROL BOX
Refer to -Open bracket and hardware
44 44
LA400 Manual - Page 46
... of two years from state to you . THIS LIMITED WARRANTY DOES NOT COVER ANY PROBLEMS WITH, OR RELATING TO, THE GARAGE DOOR OR GARAGE DOOR HARDWARE, INCLUDING BUT NOT LIMITED TO THE DOOR SPRINGS, DOOR ROLLERS, DOOR ALIGNMENT OR HINGES. Technical Support Group 6050 S. REPAIR PARTS » HOW TO ORDER REPAIR PARTS
HOW TO ORDER REPAIR PARTS...
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