Symptoms your ceiling fan has a bad receiver can include rotational shimmying (Chubby Checker behavior) of the fan, or loss of effective range of the remote.
How to replace receiver in a Minka Aire Ceiling Fan (such as F887 with remote RH-786R):
1. Turn off fan power at breaker.
2. Consider alternatives to replacing: If receiver has gone from performing well to not responding at all, consider first trying to reprogram it (see steps 14-16). If there is possible interference, try changing the remote's frequency (see manual), then re-programming receiver to that new frequency.
3. Twist off the "canopy cover" (a ring) by hand. A kitchen jar-gripper pad may help. Photo (from above after removal) shows the keyholes by which it was locked to the heads of two "canopy" screws.
4. With power off at breaker, undo the two canopy screws, lower the canopy, remove wire nuts and detach wires, and get them out of the way for step 3.
5. Lift the fan until the black hanger ball (shown) comes free of the hanger bracket. Carefully lower the fan onto a table without bending or striking the fan blades. Loosen the set screw from hanger ball as shown:
6. Slide down the ball, remove the crosspin as shown, then slide ball off the downrod.
7. Remove canopy and canopy cover:
8. Remove coupling cover:
9. Remove all six screws from the housing:
10. Remove the hitch pin, lock pin, and two set screws from the top coupling:
11. Undo the two plastic cable ties ("zip" ties) as follows: New ties must be obtained for reassembly, but new ties may be too large for the housing holes. In that case, cut old ties in a way that leaves as much reusable length as possible, and leave them passed through the housing holes. New ties can then be looped around wiring only, with old ties looped through the new ties to hold them against the housing.
12. Unplug the two wiring plugs, unscrew the two mounting screws and (as shown) the grounding screw.
13. Re-installation is reverse of steps 3-12.
14. With power still off at breaker, disconnect hot (black) wires to any other nearby fans that you do not want to accidentally reprogram the receivers of. These receivers will remember their last programming even when without power.
15. Turn on power at breaker.
16. Programming (or re-programming) a fan's receiver to learn the frequency of a remote is done as follows: Wall switch must be turned from off to on, and then within a certain time (manual says 60 seconds), you must bring the remote within range (very close if your receiver(s) have started to go bad) then press and hold the stop button of the remote for several seconds. (Seems to be 4 seconds, but manual says 10.) IMPORTANT: Contrary to instruction manual, you must then turn off the power again, then on again, before the fan will respond to the remote. Otherwise it will just spin in reverse and not react at all. Determining this conflict with manual took much trial and error, and I'm still not certain whether there is any minimum number of seconds the power must be off between steps.