Here you find some videos that illustrate common issues in setting up and running a Black Forest Clock and how to fix them. Additional languages can be found here:

Unwrapping and hanging of your clock

Troubleshoot: Your Original Black-Forest Cuckoo Clock does not work

Troubleshoot: The music of your Original Black-Forest Cuckoo Clock does not work

Troubleshoot: The cuckoo in your Original Black-Forest Cuckoo Clock is not calling

Troubleshoot: The clock hands are not working