Yes I've downloaded it, and it looks interesting. I've checked only files matched with IRB1600, and there ara many information, some assembly drawings, especially in Product Manual pdf. Now I know that there are normal toothed gears.
And I've found way to check reduction ratio. I can use Robot Studio (programming software), and use ReadMotro() function of this programme. By 90 dgs revolution of arm I can determine the ratio.
But it will take some time, now I don't know Robot Studio, and I dont' want to destroy sth.
If someone know sth about ratio, drawings, weight of parts, please write.