Aligning the Safety Sensors

•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 white/black wires sufficiently to

connect to the opener terminal screws: white to 2 and white/black to 3.

•Plug in the opener. Green indicator lights in both the sending and receiving eyes will g/owsteadilyif wiring connections and alignment are correct.

The sending eye indicator light will 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 sendingeye 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.

Hardware Shown Actual Size

1/4-20x1-1/2'

Figure 6

IndLcator

Ught

1/4-20 X 1-1/2'

HexBolt

Trouble Shooting

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 steadilybut 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 misa/igned while the door is closing, the door will reverse. If the door is already open, it will not close. The opener lights will flash 10 times. (_ifbulbs are not installed, 10 clicks are audible.) See page 21.

Figure 7

Connect Wire to

Opener Terminals

Door Control		Sensor
Corlnections_	---	ConnocUorls
(dotted line)	---	/

[]

OPENER TERMINAL SCREWS

139.53664SRT2 specifications

The Craftsman 139.53664SRT2 is a highly regarded garage door opener that combines reliability, advanced technology, and user-friendly features. Designed for residential use, this model stands out due to its robust functionality and ease of installation, making it a popular choice among homeowners.

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Craftsman 139.53664SRT2 owner manual Aligning the Safety Sensors, Trouble Shooting

Models: 139.53664SRT2