Craftsman 139.53664SRT2 - Manual (Page 23)

• 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 wire to wall and
ceiling.
• Strip 1/4" of insulation from each set of wires.
Separate white and whiteAjlack 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. Green indicator lights in both
the sending and receiving eyes will glow steadily ^
wiring connections and alignment are correct.
The sending indicator light wilf glow regardless
of alignment or obstruction. If the indicator light is
off, dim, or flickering in the receiving eye (and the
invisible light beam path is not obstructed),
alignment is required,
• Loosen the sending 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
wing
1/4-20 X 1-1/2'
Hex Bolt
Trouble Shooting
1. If the sending eye indicator light does not glow
steadily eWer 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 steadHy^\A
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, realign
either sensor.
NOTE: When the invisible beam path is obstructed or
misaligned while the door is dosing, the door will
reverse. If the door is already open, it will not dose.
The opener lights will flash 10 times. (If bulbs are not
installed, 10 dicks are audible.) See page 21.
'Sensor
Invisible Light Beam
Protection Area
/
Sensor
23