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Posted by jloomis on January 17, 2009, 11:28 am
I would oil and lube parts....
The force sensor is doing its job.
I noticed on many automatic doors the hardware gets gummed up, rusty, and
parts and pieces do get loose. After a tightening, and spraying WD-40 or
some type oil.....things do work more smooth.
jloomis
> Agreed. The fastest diagnosis for that is to uncouple the door and see
> how hard it is to opena nd close by hand.
>> wrote:
>>>thank you so much Peter. One thing you mentioned was to check the lens
>>>cover on the Sending unit........ I had only checked the Receiver. I
>>>will
>>>check the Sender tomorrow.
>>>The door will start down, but after a bit it will reverse and go back up.
>> OK, this sounds exactly like the force seensor is tripping. This is a
>> sensor that monitors the motor's current, when it sees a rise in
>> current above an acceptable predetermined limit, it reverses the door
>> thinking that the door is blocked. This is doen because it is possible
>> to have a car in the doorway but because of the wheels holding it (the
>> car) above the sensor light beam, the light won't be blocked.
>> If the light sensor is not working the door will not even start down
>> on most models.
>>>It will open fine. I can force it down by pushing the wall switch and
>>>holding it until the door is fully closed.
>>>I need to get the model number of the unit, and will post it. I do know
>>>that it is quite old............
>> 'quite old' is a broad range! What I call old, some people think of as
>> relatively new. And I've seen stuff that was described as old, and I
>> figured it was relatively new! See if you can find a date code on the
>> label...
>>>Thanks again.
>>>James
>
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Posted by James on January 17, 2009, 11:52 am
Ok, I did try the "free wheel" test, by releasing the latch and manually
putting the door up and down. It goes up and down freely, with no binding
etc
I tried to do the eye to eye matchup with the two sensors, but when I plug
the receiver sensor in, the led on the transmitter goes out. This is not
right........
if i just keep power to the transmitter, the led comes on.......... but
when I power the receiver, the transmitter light stays off, no matter where
i aim the receiver.... there is just no pilot light on the sending
unit........
from this, I am suspecting more and more that I have bad sensors.....
what you guys think ??
James
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Posted by jamesgangnc on January 17, 2009, 12:13 pm
Does it have force limit adjustments? They would be trim pots behind small
holes in the case.
Probably ought not say this but... you can remove the optical safety sensor
from the circuit. If you do not have any small children or stupid pets then
it's not really that big a deal. Mine is old enough it does not have those
sensors. Alternatively you could bypass it to see if that fixes it.
If you really want to replace them I have usually found that sears is
actually pretty good about having and getting parts from.
> Ok, I did try the "free wheel" test, by releasing the latch and manually
> putting the door up and down. It goes up and down freely, with no binding
> etc
> I tried to do the eye to eye matchup with the two sensors, but when I
> plug
> the receiver sensor in, the led on the transmitter goes out. This is
> not
> right........
> if i just keep power to the transmitter, the led comes on.......... but
> when I power the receiver, the transmitter light stays off, no matter
> where
> i aim the receiver.... there is just no pilot light on the sending
> unit........
> from this, I am suspecting more and more that I have bad sensors.....
> what you guys think ??
> James
>
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Posted by James on January 17, 2009, 12:30 pm
we do not have children or pets. I still plan on getting a set of new
sensors, but would like to disable them for the ten days it will take for
online ordering and shipping......
to remove, can I just take the wires off the screw tabs where they are
hooked up ?
James
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Posted by jamesgangnc on January 17, 2009, 1:52 pm
Seems they thought of that. Looks like they recognize being disconnected.
I suspect the correct value resistor across the terminals would do it but it
looks like what most people do is take them off and mount them close to each
other above the opener. They seem to be fairly generic so lowes or home
depot might have some that you could replace with.
> we do not have children or pets. I still plan on getting a set of new
> sensors, but would like to disable them for the ten days it will take for
> online ordering and shipping......
> to remove, can I just take the wires off the screw tabs where they are
> hooked up ?
> James
>
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> how hard it is to opena nd close by hand.