Craftsman 139.536481DM Owner's Manual page 22

Mounting and Wiring the Safety Reversing Sensors
• Slide a 1/4"-20xl/2" carriage bolt head into the slot on each
sensor. Usewing 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 6).
• Fingertighten 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" (6 mm) of insulation from each set of wires. Separate
white and white/black wires sufficiently to connect to the
terminal screws: white to 2 and white/black to 3 (Figure 7).
ALIGNINGTHE SAFETYREVERSING SENSORS
• Plug in the opener. The indicator lights in both the sending and
receiving eyeswill glow steadily if wiring connections and
alignment are correct.
The sending eye green indicator light will glow regardless of
alignment or obstruction. If the green indicator light in the
receiving eyeis 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 6
"C"Wrap _j Wing I
Indicato
Hex Bolt _. _ _
1/4-20 x 1-1/2_
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 eyeindicator light glows steadily but the receiving
eye indicator 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. The opener lights will blink 10 times.
(If bulbs are not installed, 10 clicks can be heard.) Seepage 20.
Figure7
Finished
Bell Wire Ceiling
Connect Wire to
Terminal Screws
Bell Wire
Door Control
Connections
(dotted line)
Sensor
Connections
J
OPENERTERMINAL SCREWS
Safety Reversing Sensor
Invisible Light Beam
Protection Area
Safety Reversing Sensor
22