This thing is driving me crazy.
A couple of weeks ago after all the back-and-forth on the list, I had
managed to convince myself that the circuit board was bad. I ordered a
new one from Amazon and put it in; it was a perfect fit, and the problem
did NOT go away. Ok, now I was finally convinced the sensors were at
fault.
I put the old board back in place, and pulled the sensors off their
brackets, and taped them to a stick so they were an inch or so apart,
and the door worked fine. So, it looked like the sensors had gone bad.
I put the taped-together sensor assembly up on one of the wall studs and
ordered a new pair of "universal" sensors from Amazon. While I was
waiting for the new sensors to arrive, even with the sensors taped
lens-to-lens, it wouldn't go down without holding the button. I figured
the sensors were really, really dead.
The new sensors came about a week later, I installed them in all of
about ten minutes, and the door worked fine. Problem solved! Since it
was working so well, I got an RMA and returned the PCB.
About a week or so later, this afternoon, guess what? Same problem
again. Door won't go down without holding the button. Sensors are
clean and well aligned, orange and green leds on the sensor are lit, and
the green one goes out when I interrupt the beam, but the door won't go
down without the button being held down. I disengaged the door from the
traveler, and it still won't go down....increased the setting on the
"down" force pot, same problem.
I think I'm going to H.D. next week end and buy a whole new GDO and be
done with it. I'm sick of this.
On 9/15/2014 7:51 AM, Paul Parkanzky wrote:
> At our current house, the sensors would act up when the sun was shining on one
> of them at just the right angle. I ended up having to make a shade out of a
> piece of disposable cutting board to make it reliable.
>
> -Paul
>
>> On Sep 15, 2014, at 4:31 PM, Jeff Scarbrough <fishplate@gmail.com> wrote:
>>
>> I second the beam issue. I've had occasions before where the beam was
>> barely aligned, but the action of the door starting must have shook it
>> or flexed it off. I'd watch the lights on the beam receiver as the
>> door is operated and see what happens, or I'd go ahead and clean and
>> re-align the beam, making sure it's centered.
>>
>> Jeff Scarbrough
>> Corrosion Acres, Ga.
>>
>>> On Mon, Sep 15, 2014 at 10:18 AM, Steven Trovato <strovato@optonline.net>
> wrote:
>>> All the advice about lubricating rollers and checking for binding is all
>>> good and worthwhile to do. However, with my Chamberlain openers, when the
>>> light blinks and it refuses to close, it means the safety beam system is
>>> detecting an obstruction. It could be a beam alignment issue, it could be
>>> dirt or something on the lens. It could be a fault in the circuit board.
>>> In my experience, though, it is never related to the door binding. On my
>>> openers the door may reverse because of binding, but this does not cause
>>> the light to blink. The fact that the problem went away for a week when
>>> the service guy came leads me to believe that it is not a fault in the
>>> board. It is more likely to be a beam alignment or cleaning issue.
>>>
>>> -Steve Trovato
>>> strovato@optonline.net
>>> _______________________________
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