Craftsman 139.53903DM Owner's Manual page 22

MOUNTINGAND WIRING THE SAFETYREVERSING SENSORS
• Slide a 1/4"-20xl/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 (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 7/16" (11 mm) of insulation from each set of wires.
Separatewhite and white/black wires sufficiently to connect to
the opener quick-connect terminals. Twist like colored wires
together. Insert wires into quick-connect holes: white to white
and white/black to grey (Figure 6).
ALIGNINGTHE SAFETYREVERSING 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 eyeamber 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.
• Loosenthe sending eyewing nut and readjust, aiming directly
at the receiving eye. Lock in place.
• Loosenthe receiving eyewing nut and adjust sensor until it
receivesthe sender's beam. When the green indicator light
glows steadily, tighten the wing nut.
Figure 5
Wing Nut
TROUBLESHOOTING T HE SAFETYREVERSING SENSORS
1. If the sending eyeindicator 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 opener connections.
• Incorrect wiring between sensors and opener.
• A broken wire.
2. If the sending eye indicator light glows steadily but the
receiving eyeindicator light doesn't:
• Checkalignment.
• Checkfor an open wire to the receiving eye.
3. If the receiving eye indicator light is dim, realign either sensor.
NOTE: Whenthe 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. Theopener lights will blink 10
times. See page 20.
Figure6
Bell Wire
Connect Wire to
Quick-Connect Terminals
Finished _-_'_"
Ceiling
Bell Wire
Safety Reversing
Sensor
Invisible Light Beam
Protection Area
Safet Reversing
Sensor
1. Strip wire 7/16"
(11 mm)
I 7/16"(11 mm) I
2. wist like colored
wires together
3. To release or insert
wire, push in tab with
screwdriver tip
Red White Grey
Quick-Connect Terminals
22