Gday kramerica :),
And Welcome to CoffeeSnobs [smiley=thumbsup.gif].
I used to own a Lux Grinder and all in all, theyre not too difficult to look after. Before starting, take note of the Grind Setting by noting the number its set on then gently wind the burr-carrier inwards a short distance until it comes up against the Stop Screw or the burrs make contact. Note the Grind Setting number again so that you can record the "Datum" point for resetting the grinder back to your original position later on.
Basically, to remove the upper burr carrier/hopper, you just need to keep the Grind Step Lock Button depressed while you unscrew the upper assembly.... takes a little while as the threaded section is quite deep. Eventually though, youll end up with the hopper section in one hand and the base in the other. The Hopper is actually an interference fit into the Burr-Carrier section and can just be gently coaxed out by wiggling slightly from side to side while at the same time pulling it away from the burr carrier.
From memory, I think the discharge spout comes off by gently sliding it up but you should be able to determine that by inspecting it closely. Once you have access to the lower burr area and the discharge port in this housing, the whole thing can be easily cleaned by getting hold of a small stiff bristle brush, or just a few toothpicks, and dislodging any caked on grounds while poking a vacuum-cleaner nozzle with one of those narrow attachments, into the grinding chamber and the discharge port. It will all clean out pretty well with a little perseverance. I wouldnt use compressed air to "blow" loose material out, as some of this might end up in the motor/gearbox section and cause premature failure of these components.
To reassemble, just reverse the above procedure taking special care to ensure that the thread is properly engaged before screwing the upper burr-carrier back down. Eventually you will reach the point again where a Stop-Screw or Burr Contact prevents you from screwing this down any further, at which time you just back it off to your previously noted setting. If you havent replaced the Hopper as yet, you can do this now and then youre ready to go again. Hope this helps you out a bit K.....
Its no real loss not to have a copy of the manual, it is a very basic document and barely more than a brochure that contains no real useful information on disassembly/re-assembly. Dont sweat it though, so long as you take things slowly and carefully all will be well. All the best :),