Craftsman 139.53920D - Manual (Page 22)

MOUNTING AND WIRING THE SAFETY
REVERSING 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 ienses 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 wail 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 6).
ALIGNING THE SAFETY REVERSING 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 amber indicator light will glow
regardless of alignment or obstruction. If the green
indicator light in the
receiving eye is off, dim, or
flickering (and Ihe 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 until it receives the sender’s beam. When
the green indicator light
glows steadily, tighten the
Figure 5
TROUBLESHOOTING THE SAFETY REVERSING
SENSORS
1. If the sending eye indicator tight does not glow
steadily ai\er inslaiiation, check for:
• Electric power to the opener.
• A short in the while 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 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, reaiign
either sensor.
NOTE: When the invisible beam path is obstructed
or misaligned while the door is closing, the door will
reverse, lithe door is already open, it wHi not close.
The opener lights will blink 10 times. See page 20.
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