Hardware Shown Actual Size

•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 insutation 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.

Aligning the Safety Sensors

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

The sendingeye 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 re-adjust, aiming directly at the receiving eye. Lock in place.

•Loosen the receivlngeye wing nut and adjust sensor vertically and/or horizontally until it receives the sender's beam. When the green indicator light glows stead#y, tighten the wing nut.

1/4-20 x 1-1/2"

Figure 6

"C" Wra

Indicator

Light

1/4-20x 1-1/2"

Hex Bo_

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 steadi/ybut 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 closing, the door will reverse. If the door is already open, it will not close. The opener lights will flash 10 times. (if bu/bs are not installed, 10 clicks are audible.) See page 21.

Figure 7

Connect Wire to

Opener Terrninals

Bell Wire

Finished __

Bell Wire	Door Control		Sensor
	Door Control		Sensor
	Conneciions_		Connections
	(dotted line)	-'-	7

[]

OPENER TERMINAL SCREWS

Sensor

Invisible Light Seam

Sensor

Protection Area

139.53648SRT2, 139.53645SRT3, 139.53834SRT3, 139.53335SRT3, 139.53646SRT2 specifications

The Craftsman 139.53660SRT1, 139.53646SRT2, 139.53335SRT3, 139.53834SRT3, and 139.53645SRT3 are a series of advanced garage door openers designed for homeowners looking to enhance convenience, security, and functionality in their daily lives. Each model is equipped with cutting-edge technologies that streamline garage access while ensuring safety and durability.

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Craftsman 139.53335SRT3, 139.53834SRT3, 139.53646SRT2 Hardware Shown Actual Size, Trouble Shooting

Models: 139.53648SRT2 139.53645SRT3 139.53834SRT3 139.53335SRT3 139.53646SRT2 139.53660SRT1