User's manual for Kettler Condor Elliptical

SOURCE: Owners Manual for Kettler XTR-1

Here you go.  Its in all languages and is the only thing I could find:  http://www.kettlerusa.com/XTR1.pdf

SOURCE: Loud banging noise when using the Kettler elliptical trainer, ctr

This is a common problem for the CTR1, it actually sounds a lot worse than it is. It's just one of the 4 bolts that hold the front "pole" of the CTR1 in place that is broken. You will need to unscrew the bolts at the base (just move the plastic piece that hides the bolts up on the "pole"). After removing the pole you will need to remove the broken bolt from the inside of the "pole" with plyers. Then just put the pole back in the base, replace the screws (be sure to tighten them good). All will be good :)

This is a weak point of the CTR1, be prepared to run into the same problem again down the road...

SOURCE: how to access batter on

If you look behind the unit, (directly behind the digital readout) you'll see a small rectangular inset, if you look up in that (I used my cell phone light), you'll see a tab that you can pry with a screwdriver gently to release the computer section. Just keep one hand on top, when you pry it you'll feel the unit pop up, then you can lift it out. It takes 2 AA batteries, thankfully not some bizarre disk batteries :)
Btw when you look at the readout, you'll notice it's set in a silver square- that square is the computer module that pops out.
Hope this helps!