You can find digital versions of the original service manual and schematics at these reputable repositories:
If you’re looking to restore or repair one, having the right documentation is non-negotiable. Grundig Satellit 2000 Service Manual
The Satellit 2000 is and can be intimidating for beginners. Most service issues today stem from its age (now over 50 years old): Grundig Satellit 2000 repair Part 1 You can find digital versions of the original