Wing Nut - Chamberlain 1280 Owner's Manual

• Center each sensor unit in a "C" wrap with lenses
pointing toward each other across the door (see
Figure 7).
• Secure sensors with the hardware shown. Finger
tighten the wing nut on the receiving eye to allow
for final adjustment. Securely tighten the sending
eye wing nut.
• Run the wires from both sensors to the opener.
Use insulated staples to secure wire to wall and
ceiling.
• Strip 1/4" of insulation from each set of wires.
Separate white and white/black wires sufficiently to
connect to the opener terminal screws: white to 2
and white/black to 3.
Aligning the Safety Sensors
• Plug in the opener. Green indicator lights in both
the sending and receiving eyes will glow steadily if
wiring connections and alignment are correct.
The sending eye indicator light will glow regardless
of alignment or obstruction. If the indicator light is
off, dim or flickering in the receiving eye (and the
invisible light beamm path is not obstructed),
alignment is required.
The Chamberlain Group, Inc.
• Loosen the sending eye wing nut and re-adjust,
Attaching Sensor to "C" Wrap and Wires to Operator
aiming directly at the receiving eye. Lock in place.
Liftmaster Synchro Drive
• Loosen the receiving eye wing nut and adjust
5/19/92
sensor vertically and/or horizontally until it receives
the sender's beam. When the green indicator light
glows steadily, tighten the wing nut.
Hardware Shown Actual Size
1/4-20 x 1-1/2"
Hex Bolt
Bell Wire
Sensor

Wing Nut

Finished
Ceiling
Sensor
Invisible Light Beam
Protection Area
Figure 7
1/4-20 x 1-1/2"
1. If the sending eye indicator light does not glow
steadily after installation, check for:
• Electric power to the opener.
• A short in the white or white/black wires. These
can occur under staples or at screw terminal
connections.
• Incorrect wiring between sensors and opener.
• An open wire (wire break).
2. If the sending eye indicator light glows steadily but
the receiving eye indicator light doesn't:
• Check alignment.
• Check for an open wire to the receiving eye.
3. If the receiving eye indicator light is dim, realign
either sensor.
NOTE: When the invisible beam path is obstructed or
misaligned while the door is closing, the door will
reverse. If the door is already open, it will not close.
The opener lights will flash 10 times. (If bulbs are not
installed, 10 clicks are audible.) See page 17.
Door Control
Connections
Bell Wire
(dotted line)
19
Wing
"C" Wrap
Nut
Indicator
Light
Sensor
with Wire
Hex Bolt
Trouble Shooting
Connect Wire to
Opener Terminals
1
2
OPENER TERMINAL SCREWS
Sensor
Connections
3