Chamberlain 1200 Owner's Manual page 23

• Insert the wire connector into each
sensor and push until you hear a
click, Figure 7. The white tab on the
sensor should be flush with the back
of the connector.
Bell Wire
Invisible Light Beam
Sensor
• Run paired wires from both sensors to the opener.
Use insulated staples to secure the 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.
• Plug in the opener. Make sure the Lock Feature is
off . Green indicator lights in both the sending and
receiving eyes will glow steadily if wiring
connections and alignment are correct.
If the indicator light is off in the receiving eye
(and the invisible light beam path is not obstructed),
alignment is required.
• Loosen the receiving eye wing nut to allow slight
rotation of unit. Adjust sensor vertically and/or
horizontally until the green indicator light glows
with a steady light .
• When indicator lights are glowing steadily in both
units, tighten the wing nut in the receiving eye unit.
Safety Sensor
— Finished Ceiling —
Sensor
Protection Area
Figure 7
White Tab
Wire Connector
Connect Wire to
Opener Terminals
Bell Wire
• Center each sensor unit in a "C" wrap with lenses
pointing toward each other across the door.
• 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.
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 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 steadily but
the receiving eye indicator light doesn't:
• Check alignment.
• Check for an open wire to the receiving eye.
Hardware Shown Actual Size
1/4-20x1-1/2"
Hex Bolt
23
Tab should be
flush with back
of connector
Push connector in
until you hear a click
Connections
Wall Control
Connections
(dotted line)
1 2
OPENER TERMINAL SCREWS
Wing Nut
Wire
"C" Wrap
Indicator Light
1/4-20x1-1/2"
Hex Bolt
Sensor
Trouble Shooting
Wing Nut
Sensor
3