I have disconnected the chain and am working only with the motor itself at this point. The motor will operate in only one direction, but will turn by hand in the other without binding. I also ruled out sensors and up/down force adjustments. (Actually it is so old that it did not require the optional sensors.) This appears to be an issue with whatever mechanism starts the motor in the opposite direction. It does appear to have any mechanical issues that prevent this so I am thinking some sort of solenoid or something. I also burnished the little relay contacts to no avail. Sears/Craftsman Model 139.53513 Anybody have any thoughts? ( besides buy a new one ; )
I answered this in part yesterday. Viewed from above, closing should be CW and opening should be CCW of the sprocket. If you are good at visualization if you start the motor going down and short #'s 1 and 2 again the sprocket should stop CW rotation and start CCW rotation back up . If you short 3's 1 and 2 and the motor is pulling the door up shorting 1 and 2 should stop the motor. The next short of 1 and 2 should send the door down (CW rotation). Please let me know what happened. I get very little feedback.
