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Stanley Garage Door Opener Beam Sensor Components webster.joe 07-24-2006
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Posted by on July 24, 2006, 1:19 pm
Hi All,

I'm looking for some advice on troubleshooting/fixing the obstruction
beam sensor assembly (part #49522) on a Stanley Quite-Glide garage door
opener (model UT605-F09).

The red LED on the sensor used to be on all the time and the beeper
would only sound when the beam was broken. Now, the red LED is off all
the time and the beeper sounds every few seconds. I tried cleaning the
optics and setting the sensor/emitter up on my workbench, independent
of the motor unit, with a separate 12 VDC power supply. Even with the
sensor and emitter lined up a few centimeters away from each other, the
red LED won't light up and the beeper sounds. I can hear a faint buzz
from the sensor board when the emitter is pointed at the detector. The
buzz goes away when I hide the emitter.

The resistors and capacitors on the sensor's circuit board look to be
in good shape (nothing is burned out or leaking), so I suspect either
the phototransistor, the IR LED, or one of the other semiconductor
components is shot. I'd like to try replacing them all before giving
up on the unit. The transistors and diodes are labelled clearly
enough, but I'm not sure what parts to buy to replace the
optoelectronics and the 8-pin chip (labelled P7104 I 7507807 =B5EM810G).
Can anyone help me identify them?

Thanks in advance for your help.


Posted by Bob AZ on July 24, 2006, 4:03 pm

webster.joe@gmail.com wrote:
> Hi All,
>
>

Don't replace anything until you are are sure it is bad.
My neighbor had trouble like yours and the problem was the sensor
housing on one side had fallen down some. So realign the sensors until
both leds are glowing.

Bob AZ


Posted by Rich256 on July 24, 2006, 4:45 pm
webster.joe@gmail.com wrote:
> Hi All,
>
> I'm looking for some advice on troubleshooting/fixing the obstruction
> beam sensor assembly (part #49522) on a Stanley Quite-Glide garage door
> opener (model UT605-F09).
>
> The red LED on the sensor used to be on all the time and the beeper
> would only sound when the beam was broken. Now, the red LED is off all
> the time and the beeper sounds every few seconds. I tried cleaning the
> optics and setting the sensor/emitter up on my workbench, independent
> of the motor unit, with a separate 12 VDC power supply. Even with the
> sensor and emitter lined up a few centimeters away from each other, the
> red LED won't light up and the beeper sounds. I can hear a faint buzz
> from the sensor board when the emitter is pointed at the detector. The
> buzz goes away when I hide the emitter.
>
> The resistors and capacitors on the sensor's circuit board look to be
> in good shape (nothing is burned out or leaking), so I suspect either
> the phototransistor, the IR LED, or one of the other semiconductor
> components is shot. I'd like to try replacing them all before giving
> up on the unit. The transistors and diodes are labelled clearly
> enough, but I'm not sure what parts to buy to replace the
> optoelectronics and the 8-pin chip (labelled P7104 I 7507807 µEM810G).
> Can anyone help me identify them?
>
> Thanks in advance for your help.
>

If you haven't already done it, is there a way of by-passing the
sensors? Just a way of verifying that it is internal to the sensors.

Posted by on July 25, 2006, 2:20 pm
Without the sensor I can open the garage door with the remote control,
no problem. I can also close the door by pressing and holding the
hardwired pushbutton inside the garage. The only thing I can't do
right now is close the door with the remote because, by design, the
opener won't close the door if it can't find the sensor.

I'm sure it isn't an alignment problem since I've tried moving the
emitter directly in front of the receiver and the problem persists. I
tested the wiring too, since I've heard that is also a common problem
with beam sensors. It was all good.

I've been quoted $50 for a new sensor assembly. It would be a shame to
replace the whole thing when replacing a $2 component might do the
trick.


Posted by Rich256 on July 25, 2006, 3:17 pm
webster.joe@gmail.com wrote:
> Without the sensor I can open the garage door with the remote control,
> no problem. I can also close the door by pressing and holding the
> hardwired pushbutton inside the garage. The only thing I can't do
> right now is close the door with the remote because, by design, the
> opener won't close the door if it can't find the sensor.
>
> I'm sure it isn't an alignment problem since I've tried moving the
> emitter directly in front of the receiver and the problem persists. I
> tested the wiring too, since I've heard that is also a common problem
> with beam sensors. It was all good.
>
> I've been quoted $50 for a new sensor assembly. It would be a shame to
> replace the whole thing when replacing a $2 component might do the
> trick.
>
You obviously have isolated it to the sensors. And I expect that a $2
component is probably what it needs. Just the question if you want to
spend the time of tracing out the circuit and measuring voltages. I
never looked inside of those things but probably not a lot of
components. I would be most suspicious of the LED.

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