OK, let's start out in this example with the slide room all the in (retracted). Let's put the slide out, like you are getting ready to setup at your campsite. If you are in the trailer and and looking at the slide room and if you can see both sides of the slide, there are four cables that are visible from inside of the trailer. Before you operate the switch to put the slide out (extend it to camping position), if you can access those four cables, they should have some slack in them...1/2" up and 1/2" down for a total of 1" from top to bottom. When you operate the switch to start running the slide out or extending it, those cables will tighten up and are the four cables that are pulling the slide out to the extend position. If you would happen to stop in the middle of putting the slide out, those four cables will, or should still be tight. In fact, do just that....start out with the slide in, run it about half way out and stop. Check the inside cables....they will be tight. Now, go outside the trailer and push on the cables that you can reach that are outside.......those should have that 1/2" of slack that they refer to frequently. Now come back in and run the slide the rest of the way out until the slide is fully extended and it stops. The outside cables (all four of them...top and bottom, left and right) should all have slack. If you could reach the inside cables (you can't, so don't bother trying), they would be tight. Now run the slide back in (retract) and stop it about half way in. Now the cables that are outside the trailer are tight, and the ones inside are now loose.....the 1/2" slack thing. Continue in with the slide until it is all the way in and fully seated on the slide room seals. The inside cables have the 1/2" slack and if you could push on the outside cables (you can't, they aren't accessible anymore) they would be tight. Just try to remember the give and take thing....if four of the cables are pulling the slide in one direction, the other four cables have to have enough slack that they aren't fighting each other.
Now, if you have done the procedure that I gave the example of above, and find any variance with the cables not being like I described, it's time for adjustment. I believe I remember reading in the manual that the easiest way to do an adjustment is with the slide about 10-12" retracted from the fully out position....in other words, run the slide all the way out, then run it back in about 10-12". That position is similar to the halfway test I talked about in the above paragraph. So now you've got the slide about 10-12" in from full out. Check your cable again and see what you've got. The four outside cables, and I'm talking about the cables that are physically outside the trailer....top and bottom, on both sides of the slide, should be tight....because they were pulling the slide back in when you stopped the slide where it now sits. Check your inside the trailer cables....they should be loose (the 1/2" thing) If that is not the case, and the inside cables are tight, refer to the color chart. The RED and the PURPLE adjuster blocks are the ones that pull the slide room out.....but you aren't trying to pull the room out, you were pulling it in, so the RED and PURPLE adjusters (chains and the associated cables should be slack. If they AREN'T slack, you need to loosen all four of them one at a time, making a note of how much you loosen them, so you can do all four an equal amount. Check the inside cable again....are they looser than when you check them a few minute ago and before your adjustment? If they are, proceed to run the room all the way in to the full retract position. Now run the slide out about 10-12" and check the cables again. This time, the the inside the trailer cables should be tight, and the cables that are outside the trailer should be loose. Run the slide out some more, until it's maybe 2/3 of the way out. Stop and check them again..outside cable should still be loose and the inside should be tight. Pretty much that's it in a nutshell (I know, this is a long explanation and not so much a "nutshell" write up), but getting the slide adjusted correctly is sometimes a process that takes several adjustments to get it correct. Just remember, if you make adjustments for any four sets of cables (the four that pull it in OR the four that pull it out), you are affecting the opposite cables because of the give and take operation of this system. Hang in there, because I know from experience that it isn't the easiest thing to do, and it certainly takes time and patience, but once you get it adjusted correctly, you will be satisfied at how smoothly the slide goes in and out. Hope all this long winded write up helps.