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6 Testing & Adjusting the Door Force Safety System
The door force adjustments are located on the side of the opener. The door force adjustments must be properly
set at all times. The CLOSE FORCE adjustment controls how much force is required to cause the door to reverse
direction if an obstruction is encountered during closing. The OPEN FORCE adjustment controls how much force
is required to stop the door if an obstruction is encountered during opening.
➤ NOTE: Read the following directions carefully before
changing the door force adjustments.
Door Force Safety System Test
1 Start with the door open. Use the remote control to
cycle the door during this test.
Adjusting the Close Force
2 Turn the CLOSE FORCE adjustment 1/8-turn at a time
in the DECREASE direction (counterclockwise) until
the door stops and reverses mid travel while going
down.
3 Turn the CLOSE FORCE adjustment 1/8-turn at a time
in the INCREASE direction (clockwise) until the door
fully closes without reversing.
Safety Reversal System Test
4 Lay a 2 x 4 board fl at on the fl oor where it will be struck
by the center of the door as it closes.
5 Verify that the door reverses when it strikes the board.
The door must reverse within two seconds after
striking the board.
➤ NOTE: If the door stops after encountering the board
and does not reverse, the CLOSE FORCE needs to be
DECREASED.
6 Repeat the Safety Reversal System Test until the door
reverses within two seconds of striking the board.
Adjusting the Open Force
7 Turn the OPEN FORCE adjustment 1/8-turn at a time
in the DECREASE direction (counterclockwise) until
the door stops mid travel while going up.
8 Turn the OPEN FORCE adjustment 1/8-turn at a time
in the INCREASE direction (clockwise) until the door
fully opens without stopping.
7 Replacing the Opener’s Lamp
If the opener’s safety lamp fails to light manually or when
the opener is cycled, the light bulb needs replacing. Use
the following steps to replace the light bulb.
1 Swing the light cover open to expose the light bulb and
lamp socket.
2 Replace the light bulb with a 100 watt maximum rough
service bulb (sometimes called a garage door bulb).
3 Swing the light cover closed, snapping it shut.
4 Press the wall station’s lamp button to test the lamp.
8 Troubleshooting
LAMP FLASHES
TROUBLE CODE
PROBLEM CAUSE REMEDY
1 FLASH
No problem
Remote control entered into
memory
Add any additional remote controls
(MegaCode™ type only)
2 FLASHES
Door won’t close Shorted wall station wires
Check wall station wires. Be sure both are
connected to the terminal screws.Check for a
staple in the wall station wires. Remove any
staples compressing the wire.
3 FLASHES
Door won’t close Safety beam obstacle
Check for obstacles. Align the safety beam
(Section 4)
4 FLASHES
Door reverses
or won’t open or
close
Open or Close force
exceeded, or motor thermal
shutdown
Check for binding or un-balanced door.
Adjust the door force (Section 6). If motor had
thermal shutdown, wait 30 minutes and retry.
5 FLASHES
Door won’t open
from transmitter
Remote was activated while
vacation switch was locked
Unlock vacation switch on wall station
6 FLASHES
Motor ran longer
than 30 seconds
Mechanical or electronic
failure
Call your local garage door professional
FCC NOTICE
Changes or modifi cations not expressly described in this manual or approved by the manufacturer could void the user’s authority to operate the
equipment. This device complies with FCC Part 15. Operation is subject to the following two conditions: (1) This device may not cause harmful
interference and (2) this device must accept any interference received, including interference that may cause undesired operation.
LIMITED WARRANTY
This Linear product is warranted to the original consumer against defects in material and workmanship for:
MODEL ELECTRONICS MECHANICAL MOTOR BELT
LDO50 1 year 5 years Lifetime Lifetime
LDO33 1 year 5 years 10 years Lifetime
This product is warranted to the original consumer against defects in material and workmanship for the periods mentioned above. Linear
will repair, or at its option, replace, any device that it fi nds requires service under this warranty, and will return the repaired or replaced
device to the consumer at Linear’s cost. Devices must be sent to Linear for service at owner’s expense. This warranty does not apply
to damage to the product from negligence, abuse, abnormal usage, misuse, accidents, normal wear or tear or due to failure to follow
Seller’s instructions, or arising from improper installation, storage or maintenance. In no event will Linear be responsible for incidental,
compensatory, punitive, consequential, indirect, special or other damages. The remedies provided by this warranty are exclusive. Some
states do not allow the exclusion or limitation of incidental and consequential damages, so the above limitation or exclusion may not apply
to you. Any warranties implied by law are limited to the time periods set forth above. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specifi c legal rights, and you may also have
other rights which vary from state to state.
For warranty service and shipping instructions contact Linear at the phone number shown below. In order to be protected by this warranty,
save your proof of purchase and send a copy with equipment should repair be required. All products returned for warranty service require
a Return Product Authorization Number (RPA#). Contact Linear Technical Services at 1-800-421-1587 for an RPA# and other important
details.
4 Testing the Infrared Safety Beam
The safety beam has two components, a sender and a receiver. The sender produces a narrow infrared beam that
travels across the bottom of the door opening to the infrared receiver. If an object blocks the infrared beam while the
door is closing, the door will stop, then reverse and fully open (the opener’s light will fl ash three times).
As a safety feature, the opener will ignore signals from all remote controls if the door is open and the
infrared safety beam is blocked or out of alignment. In this case, the door can be forced closed by pressing
and holding the wall station’s up/down arrow pushbutton (be sure the door area is in clear view).
Safety Beam Test
1 Check that the opener has power. The green lights on
the sender and receiver should be lit.
2 If the receiver’s green light is on, but the red light is off,
the receiver has power but is not detecting the infrared
beam from the sender. The red light might fl ash when
the beam is partially detected. This can be caused by
mis-alignment or something blocking the beam. Adjust
the safety beam sender and receiver while watching the
receiver’s red light (stay out of the beam while aligning
it). When the red light stays on, the beam is aligned.
SAFETY BEAM INDICATOR TABLE
GREEN ON POWER ON
GREEN OFF POWER OFF
RED ON BEAM OK - NO BLOCKAGE
RED OFF BEAM BLOCKED OR MIS-ALIGNED
RED FLASHING BEAM ALIGNED POORLY
➤ NOTE: If the receiver’s red light remains off, check
for: 1) Dirt on the receiver’s lens, 2) Sunlight shining
into the receiver’s lens, 3) A short in the safety beam
wiring (from staples or at the opener terminals).
3 With the door closed and the opener disengaged
from the door, press the wall station’s UP/DOWN
ARROW button to move the traveler (the part on the
belt or chain that the trolley engages with) to the up
position (away from the door).
4 Push the wall station’s UP/DOWN ARROW button again.
While the traveler is moving to the down position (toward
the door), block the safety beam. THE TRAVELER
MUST STOP, THEN REVERSE TO THE UP POSITION.
The opener’s light should fl ash three times.
5 Place an object in the path of the safety beam. Check
that constant pressure is required on the wall station’s
UP/DOWN ARROW button to cause the traveler
to move toward the down position. Release the
pushbutton before the opener stops; check that the
traveler returns to the up position.
➤ NOTE: The garage door opener will not respond to a
CLOSE command from a radio transmitter if the safety
beam is blocked.
6 To reconnect the opener, fl ip the release lever up.
Raise the door manually until the opener reconnects.
5 Adjusting the Open and Close Limits
The limit adjustments that control how far the door will
open or close are located on the side of the opener. The
limits should be adjusted so the door opens just short of
any door stops, and closes right at the fl oor level. Each
full turn of a limit adjustment equals about 2-½” of door
travel.
1 Start with the door in the closed position.
2 Activate the remote control. Wait while the door moves
to the open position and stops.
3 Examine the position of the door.
• If the door needs to open more, turn the OPEN
LIMIT adjustment clockwise ¼-turn (towards UP on
the label) to raise the open limit.
• If the door needs to open less, turn the OPEN LIMIT
adjustment counterclockwise ¼-turn (towards DOWN
on the label) to lower the open limit.
➤ NOTE: On jamb doors, set the open limit so the door
stops just short of level (see fi gure).
4 Activate the remote control. Wait for the door to move
down a few feet, then activate the remote control again
to stop the door.
5 Repeat Steps 2-4 until the open limit is properly
adjusted.
6 Activate the remote control. Wait while the door moves
to the closed position and stops.
7 Examine the position of the door.
• If the door needs to close more, turn the CLOSE
LIMIT adjustment counterclockwise ¼-turn (towards
DOWN on the label) to lower the close limit.
• If the door needs to close less, turn the CLOSE
LIMIT adjustment clockwise ¼-turn (towards UP on
the label) to raise the close limit.
8 Activate the remote control. Wait for the door to move
up a few feet, then activate the remote control again to
stop the door.
9 Repeat Steps 6-8 until the close limit is properly
adjusted.
➤ NOTE: If the door stops during opening or reverses
during closing before reaching the limits, the door force
adjustment needs to be set. Change the adjustment as
described in the next section then return to this step to
fi nish setting the limits.
CAUTION
Set the open and close limits carefully. Setting
the limits beyond the distance that the door can
travel could cause damage to the door, the door
hardware, or opener.
WARNING
Too much door force will interfere with the
proper operation of the safety system. SOMEONE
COULD BE SERIOUSLY INJURED OR KILLED IF THE
DOOR FORCE IS SET TOO HIGH. A closing door
might not reverse properly when required and
someone could be pinned under it. An opening
door might not stop when going up and someone
hanging on the door could get pinned between
the door and the header. Do not increase the
door force beyond what is required to move the
door. DO NOT USE THE DOOR FORCE ADJUSTMENT
TO COMPENSATE FOR A BINDING OR STICKING
GARAGE DOOR. PERFORM THE SAFETY REVERSAL
SYSTEM TEST (STEPS 4-6) MONTHLY!
Copyright © 2007 Linear LLC 223710 B
PRINTER’S INSTRUCTIONS:
INSTR,HOMEOWNERS,LDO W/MCT3; LINEAR P/N: 223710 B; INK: BLACK; MATERIAL: 20# MEAD BOND; SIZE: 11.000” x 17.000”; FOLDING: 1-FOLD VERTICAL, 1-FOLD HORIZONTAL, FINISH 8.500” X 5.500” WITH LOGO SHOWING; SCALE: 1-1; SIDE 2 OF 2
SAFETY BEAM INDICATORS
RED LIGHT
GREEN LIGHT
GREEN LIGHT
ON = POWER ON
OFF = POWER OFF
RED LIGHT
ON = BEAM ALIGNED, NO OBSTRUCTION
OFF = BEAM NOT ALIGNED, OR OBSTRUCTION
BLINKING = BEAM NEEDS BETTER ALIGNMENT
ADJUST THE SENDER
AND RECEIVER UNTIL
THE RED INDICATOR
LIGHTS SOLID
ADJUSTING THE BEAM
BLOCK THE BEAM
WHILE THE TRAVELER
IS MOVING DOWN
TOWARD
DOOR
TOWARD
OPENER
UP
DOWN
CHECKING FOR REVERSAL
TRAVELER
THE TRAVELER MUST REVERSE
WHEN THE BEAM IS INTERRUPTED
PLACE AN OBJECT
IN THE BEAM'S PATH
VERIFY THAT CONSTANT
PRESSURE IS REQUIRED
ON THE WALL STATION'S
PUSHBUTTON TO MAKE
THE TRAVELER GO DOWN
RELEASE PUSHBUTTON
BEFORE THE OPENER STOPS,
THE TRAVELER SHOULD
RETURN TO THE UP POSITION
CHECKING FORCED CLOSURE FEATURE
WARNING
With the door closed, disengage the trolley
from the chain during these alignment tests by
pulling the red release handle.
WARNING
Serious injury or death from a closing garage
door may result because of failure to test and
adjust safety reverse system. Repeat this test
monthly and adjust as needed.
USE A SCREWDRIVER
TO ADJUST THE LIMIT
SETTING THE OPEN LIMIT
OPEN LIMIT
ADJUSTMENT
UP
DOWN
CLOSE LIMIT
ADJUSTMENT
UP
DOWN
USE A SCREWDRIVER
TO ADJUST THE LIMIT
SETTING THE CLOSE LIMIT
DOWN
UP
EXAMINE THE SPOT WHERE
DOOR STOPS CLOSING
CHECKING WHERE THE DOOR STOPS
DOWN
UP
EXAMINE THE SPOT WHERE
THE DOOR STOPS OPENING
CHECKING WHERE THE DOOR STOPS
ADJUSTING THE CLOSE FORCE
ADJUSTING THE OPEN FORCE
SETTING THE DOOR FORCE
CLOSE FORCE
DECREASE
DECREASE CLOSE FORCE
ADJUSTMENT UNTIL THE
DOOR REVERSES MIDWAY
WHILE GOING DOWN
UNDER-SETTING THE CLOSE FORCE
TEST WITH SMALL OBSTACLE
THE DOOR MUST REVERSE
WITHIN 2-SECONDS AFTER
IMPACT WITH A 2 x 4 BOARD
2 x 4 BOARD LAID FLAT
UNDER
CENTER OF DOOR
TESTING THE SAFETY REVERSAL SYSTEM
OPEN FORCE
DECREASE
DECREASE OPEN FORCE
ADJUSTMENT UNTIL THE
DOOR STOPS MIDWAY
WHILE GOING UP
OPEN FORCE
INCREASE
INCREASE OPEN FORCE
ADJUSTMENT UNTIL THE
DOOR OPENS FULLY
WITHOUT STOPPING
UNDER-SETTING THE OPEN FORCE SETTING THE OPEN FORCE
CLOSE FORCE
INCREASE
INCREASE CLOSE FORCE
ADJUSTMENT UNTIL THE
DOOR CLOSES FULLY
WITHOUT REVERSING
SETTING THE CLOSE FORCE
INSTALL NEW BULB (UP TO 100 WATTS)
REPLACING LAMP
SWING COVER OPEN
WARNING
Always perform the Door Force Safety System
Test after making any adjustments to the
opener.
SETTING THE OPEN LIMIT ON A JAMB DOOR
JAMB DOOR
SET THE OPEN LIMIT SO THE DOOR
STOPS JUST SHORT OF LEVEL
NOTE: SETTING THE OPEN LIMIT TOO HIGH WILL CAUSE
THE OPENER TO "BUCK" WHEN STARTING DOWN