Craftsman 139.18076 Owner's Manual page 23

1/2 hp garage door opener for residential use only
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Mounting and Wiring the Safety Sensors
• Slide a 1/4"-20x1/2" carriage bolt head into the slot
on each sensor. Use wing nuts to fasten sensors to
brackets, with lenses pointing toward each other
across the door. Be sure the lens is not obstructed by
a bracket extension. See Figure 5.
• Finger tighten the wing nuts.
• 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. The indicator lights in both the
sending and receiving eyes will glow steadily if wiring
connections and alignment are correct.
The sending eye orange indicator light will glow
regardless of alignment or obstruction. If the green
indicator light in the receiving eye is off, dim, or
flickering (and the invisible light beam path is not
obstructed), alignment is required.
• Loosen the sending eye wing nut and readjust,
aiming directly at the receiving eye. Lock in place.
• Loosen the receiving eye wing nut and adjust sensor
vertically and/or horizontally until it receives the
sender's beam. When the green indicator light glows
steadily, tighten the wing nut.
Figure 6
Wiring the Safety Sensors
Bell Wire
Invisible Light Beam
Sensor
Finished
Ceiling
Sensor
Protection Area
Figure 5
1/4"-20x1/2"
Carriage bolt
Trouble Shooting the Safety Sensors
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 at staples, or at screw terminal connections.
• Incorrect wiring between sensors and opener.
• A broken wire.
2. If the sending eye indicator light glows steadily but the
receiving eye indicator light doesn't:
• Check alignment.
• Check for a broken 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 can be heard.) See page 21.
Bell Wire
23
Wing nut
Lens
Connect Wire to
Opener Terminals
Sensor
Door Control
Connections
Connections
(dotted line)
1
2
OPENER TERMINAL SCREWS
3

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