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• Center each sensor unit in a "C" wrap with lenses
pointing toward each other across the door (see
Figure 6).
• 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 the wire to the 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.
• Plug in the opener. Make sure the Lock Feature is
off . Green indicator lights in both the sending and
receiving eyes will glow steadily if wiring
connections and alignment are correct.
If the indicator light is off in the receiving eye (and
the invisible light beam path is not obstructed),
alignment is required.
• Loosen the receiving eye wing nut to allow slight
The Chamberlain Group, Inc.
rotation of unit. Adjust sensor vertically and
Attaching Sensor to "C" Wrap and Wires to Operator
horizontally until the green indicator light glows
with a steady light .
Liftmaster Synchro Drive
• When indicator lights are glowing steadily in both
5/19/92
units, tighten the wing nut in the receiving eye unit.
Hardware Shown Actual Size
1/4-20x1-1/2"
Hex Bolt
Figure 7
Bell Wire
Sensor
Wing Nut
Finished
Ceiling
Sensor
Invisible Light Beam
Protection Area
Figure 6
"C" Wrap
Indicator
Light
1/4-20 x 1-1/2"
Hex Bolt
Trouble Shooting
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.
Figure 7
Bell Wire
23
Wing
Nut
Sensor
with Wire
Connect Wire to
Opener Terminals
Sensor
Wall Control
Connections
Connections
(dotted line)
1
2
OPENER TERMINAL SCREWS
3
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