Similar model 420 free manual online:
https://www.manualslib.com/manual/588763/Grundig-Sonoclock-420.html
Grundig Sonoclock 420 User Manual
SOURCE: Grundig sonoclock 420 radio/alarm
Hello Sally,
here is the solution :)
https://dex.grundig.de/GIM/internet/document/GKL0151D.PDF
maybe it doesn´t work try this site and choose
http://www.grundig.de/index.php?id=9
Greets
miieke
SOURCE: How to set the time
1. Press and hold down TIME.
2. Press HOUR briefly to set the hours step by step or hold it down to run through the hours quickly.
3. Press MIN briefly to set the minutes step by step or hold it down to run through the minutes quickly.
4. Release TIME to conclude the settings.
Thanks.
gylacz
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