I have an older , Sears, chain operated garage door opener. Mechanically,
the door is working fine, but I have a problem with the two safety sensors
that beam a light across the bottom edge of the door, about 5 inches off the
floor bottom.

The door will open fine, but will not close. I am 99% sure the problem is
in the two sensors just described.

On one of the sensors, which I think is the sending unit, the little pilot
led light is bright and pretty. However, on the other unit, which is
marked the "Receptor" unit, the small led light is barely, barely, lit.
It is getting voltage, as the led pilot light will very faintly light up
when I apply the electrical wiring plug into it. I can also tell that when
I line up the two sensors, and then place my hand across the beam of light,
I can just barely detect that it faintly changes the intensity of the led
pilot light.

My suspicion is that this "Receptor" unit has gone bad.

Two Questions please:

1. Am I on the right track ?

2. Can these sensors be bought at Lowe's or Home Depot ?

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Any comments or input would be very much appreciated.

Thank you very much !!

James