garage door opener photo cells

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Old 08-30-10, 08:56 PM
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garage door opener photo cells

Got a new garage door opener. For some reason, it doesn't have photo cells. Has two connections, but no actual photo cells.

However, I've got what were good ones, from an old Chamberlain lift.

They both have small lites on top, and you get those aimed at each other.

Are those units both receptor and transmitter ? Or, is one a receptor, and one a transmitter ? Just curious.

I'm hoping these will work OK with the new opener I've got.
 
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Old 08-31-10, 03:43 AM
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Can you provide some more info? I couldn't say one way or the other what they are or whether they're compatible.
 
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Old 08-31-10, 06:25 AM
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Sure. It'll be later...
 
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Old 08-31-10, 08:47 AM
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Check the packing list and owners manual. All openers are required to have safety devices. If you are supposed to have sensors, and they are not in the box, take it back to the store.
 
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Old 08-31-10, 09:06 AM
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Some openers (WD?) don't use the typical sensors for normal operation. What brand and model is it?

Kinda sounds like someone went box raiding before you got it. As in..buy an opener...take it home...take out the parts you need...reseal it and return to store.
 
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Old 08-31-10, 11:00 AM
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More good info: It turns out that there are two connections on the ceiling unit. They are marked for the cells.

It turns out my photo cells look the same. They're not. One is a receptor, the other is a transmitter. Both have small lites on them, and they should shine brightly, as long as the units "see" each other. So, we have one receptor, with two leads. We have one transmitter with two leads. These may be infrared--not sure.

I'm wondering which leads on the ceiling unit go to the receptor and transmitter?

I guess this thing works by the light beam interruption breaks a circuit, which causes the door to not come on down.

Still not sure how it breaks the circuit.
 
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Old 08-31-10, 11:54 AM
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Ummm....rbig...you've been here long enough to know...if you don't answer the questions asked..we can't help.

Some sensors are compatible among brands..others aren't.

What model and brand do you have?

And yes...most (all?) have a rcvr and a transmitter).
 
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Old 08-31-10, 01:56 PM
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The overhead unit is a CASAR 600. The door units are Chamberlain.

I'll have to ask CASAR if they're compatible or not.
 
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Old 08-31-10, 04:57 PM
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Looks like you get what you pay for. For about $10 more you could have purchased the complete opener with sensors and a push button.
 
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Old 10-20-10, 07:02 PM
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photo eyes are a switch

it is my opinion that all photo cells are the same and
are the two part (sender/receiver) which either completes
the circuit or breaks it.
testing if the photo cell is the problem would be to bypass
them with jumper wire.
running the opener without the door engaged is a good test.
running door without opener is another.
using an ohm meter to test photo cell is good.
 
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Old 10-20-10, 07:56 PM
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Good info. Thanks! Appreciate the input.
 
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Old 10-21-10, 07:17 AM
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Little older post...but sorry, techknownut is incorrect for most newer openers. You cannot bypass or jumper around the eyes. The opener will just give an error code. At least the newer Genies and Chamberlains that I have worked with in the last few years will.

There are actually componants in the eyes..not just an IR diode and sensor.

I also doubt a simple ohmmeter test will show you anything.
 
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Old 11-01-10, 12:44 PM
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I would like to add just a bit to this even though it is late. Maybe someone else will stumble onto this. The sending unit of the door sensors sends an infrared signal to the receiving unit which in turn tells the logic board that the door is clear of obstacles. There is no way to jumper or eliminate the door sensors and there never has been. Checking for voltage at the sensors will let you know the wiring between them and the motor unit is good. Nothing else.
 
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Old 11-03-10, 06:07 AM
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Originally Posted by figpickle View Post
There is no way to jumper or eliminate the door sensors and there never has been.
I have to disagree about "never has been". The old Genie in my garage has a 3-conductor connector that sends power, contact sense, and common to the sensor. The sensor is an IR transmitter and a receiver. The other side is a simple reflector. A relay inside the transceiver opens when the beam is interrupted causing the door to reverse.

The sensor failed, so I soldered a jumper across the common and contact sense leads of the connector.
 
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