Test The Safety Reverse System; Troubleshooting; Replacement Parts - Chamberlain Protector System 770EML Manual

Bell Wire
Finished
Ceiling
Sensor
Invisible Light Beam
Sensor
Protection Area
• Center each sensor unit in a "C" wrap with lenses pointing
toward each other across the door.
• Secure sensors with the hardware shown in Figure 6. Finger
tighten the wing nut on the receiving eye to allow for final
adjustment. Securely tighten the sending eye wing nut.
• Run wires from both sensors to the opener as shown in Figure 6.
Use insulated staples to secure the wire to the wall and ceiling.
• Connect both sets of wires to the opener terminals as shown.
• Plug in the opener. If your opener has the Multi-Function Door
TEST THE PROTECTOR SYSTEM™
• Press the remote control push button to open the door.
• Place an object large enough to obstruct the sensor beam in the
path of the door.
• Press the remote control push button to close the door. The
door will not move more than an inch (25mm).
The garage door opener will not close from a remote control if
the indicator light in either sensor is blinking (alerting you to
the fact that the sensor is misaligned or obstructed).
You can operate the garage door opener by disconnecting the
safety reversing sensor.
Professional service is required if the opener closes the door
when the Protector System™ is obstructed.
TROUBLE SHOOTING
1. If the sending eye or receiving eye indicator light does not
glow after installation, check for:
• Electric power to the opener.
• A short in the black/white wires. These can occur under
staples or at screw terminal connections.
• Incorrect wiring between sensors and opener.
• An open wire, (wire break).
• Lock switch on Multi-Function Door Control Panel is
activated. Deactivate.
2. If both sensors are blinking, realign or remove obstruction.
3. If an infrared sensor has been installed, it can not be removed
later on. The unit only operates with the IR sensor (starting
September 2004).
4. If the IR sensors are damaged and cannot be repaired, the
door, nevertheless, can be closed using the wall switch
Safety Sensor Kit (receiving and sending eyes only)
Safety sensor hardware bag.............................................41A4116
C-Wrap Bracket ...................................................................12B483
FIGURE 6
Connect Wire to
Opener Terminals
Bell Wire
Wing Nut
"C" Wrap
Sensor

REPLACEMENT PARTS

41A4887-2
Wire
Indicator
Light
1/4-20x1-1/2"
Hex Bolt
Control, make sure the Lock Feature is off. Red indicator lights in
both the sending and receiving eyes will glow if wiring
connections and alignment are correct.
If the indicator lights are blinking (and the invisible light beam path
is not obstructed), alignment is required.
• Loosen the receiving eye wing nut to allow slight rotation of unit.
Adjust sensor vertically and/or horizontally until the red indicator
light glows.
• When indicator lights are glowing in both units, tighten the wing
nut in the receiving eye unit.

TEST THE SAFETY REVERSE SYSTEM

Failure to test and adjust the safety reverse system may
result in serious injury or death from a closing garage
door. Repeat this test once a month and adjust as needed.
TEST:
• Place a one-inch (25mm) obstacle 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 direction.
• Increase the DOWN limit by turning the DOWN limit adjustment
screw counterclockwise 1/4 turn.
• Repeat the test.
On a sectional door, make sure limit adjustments do not force
the door arm beyond a straight up and down position.
• When the door reverses on the one-inch (25mm) obstacle,
remove the obstruction and run the opener through 3 or 4
complete travel cycles to test adjustment.
If the door will not reverse after repeated adjustment
attempts, call for professional door service.
Square Hole Bracket............................................................12B484
Slotted Bracket ....................................................................12B485
3-EN
Connect Sensor Wires to
Opener Terminals
1 2 3
ML2000/3000/4000/5000/5500
Sesam100/200
420E/440E
ML500
ML700/750/850