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garage door opener frequency change -- I need to disable the old receiver

I have a Craftsman 1/2 HP GDO from 08/91, model 139.53615SR. It occasionally opens and closes with no signal from me. I understand that the old 890MHz frequency is subject to military interference and that this is a known problem. Sears suggested that I buy the conversion kit to change to 815 MHz which I did: PN 953751. I installed it and it works fine: it's just that my old remote still controls the 890 MHz unit in the GDO and the new remote controls the new 815 MHz receiver. This is no good to me because if my local base is sending interfering signals on 890 it will continue to open the door. How do I disable the 890 MHz receiver so that all I have is the 815 unit? There are no instructions with the conversion kit.

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Manage My Life
Andrew you cannot change out the logic board like you asked. When the frequency changed the manufacturer also changed the electrical connections to the logic board. Your phantom operation could be caused by a bad wall control or the wiring going to it. You can eliminate both possibilities temporarily if you like by removing the wire on terminal #1 on the back of the motor unit. This will of course disable the wall control.
by Manage My Life
May 24th, 2010
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Manage My Life
Bob B: Thank you for the quick response. I took off the antenna for the GDO as short as possible and it still picks up the old remote from 50 yards away! It seems a real shame to toss out a whole working GDO just because the frequency changed. If the receiver and switch mechanism and logic circuit are all on the same board can I just change that out for a new one with 315 MHz receiver? Is that part available?

Thanks again.

Andrew
by Manage My Life
May 23rd, 2010
Answered in 23 hours
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Manage My Life
Not to be critical but I believe you are talking about 390 and 315 mhz, just for your future dealings.

There really is no way to just turn off or disable an internal receiver totally. The internal receiver is part of the units logic board and can't be separated. Although you can take steps to solve this problem, I will help you.

First find the colored learn button on the motor head. Hold this button down until the led light goes out. This erases all old codes out of the unit. Now look for an antenna on the motor head. It looks like a wire just hanging off the motor head and will probably be colored. Cut this wire as close to the unit as possible. This will cut down the receiving range drastically to probably 6 ft. Do not cut the one on the external receiver. If this does not fix your problem then your only course of action is to replace the whole unit with another on 315 only, but I think you will be happy with the results. 390 was the frequency almost all the big players were using, so this problem is wide spread not just this brand. Thanks BB
by Manage My Life
May 23rd, 2010
Answered in 13 hours
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