Garage Door Opener Schematic



Question:
I have bought my opener in the U.S. but i use it in France, on 120 V 50 Hz and I had to turn the force controls all the way up for it to operate. I was suspecting it had to do with some kind of speed sensing, and i was about to fall short of force. If I could find the schematic, I could tune up the resistors so that the force detection circuit matches the reduced speed at 50 Hz. I innocently did this for 15 years ago I did the same with a 60 Hz opener (a Genie with a lead screw) and it worked perftectly until it died a few weeks ago. But the force sensing at that time was an adjustable friction clutch, so no problem with the frequency.

Answer:
Well, the schematic to mine is in the Sears Owners Manual, but I've no idea whether they still put them in those manuals. Per www.sears.com the manual number for your opener is 114A2843. Good luck "reverse engineering" your unit. From what I recall seeing in the manual for my unit last nite the two rheostat connected force potentiometers had their hot ends fed from a +8 volt dc source through a single series resistor. If you unit is anything like mine and uses an unpotted PC board, it shouldn't take the CIA to trace out the circuits around those pots, measure the voltage at their (common) hot ends and try putting some ohms in parallel with that series feed resistor I mentioned above. Good luck, nothing succeeds like success!





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