Boomboxes from Sencor are the only Swiss boomboxes out there. “Designed in Switzerland”, made most probably in Japan. Well, at least the label for Sencor S-4500 says “Made in Japan”, whether this applies to S-4800 nobody seems to know. By looking at cassette mechanism it may be easy to tell who made these boomboxes for Sencor: JVC, Philips, Sony,… I am not in the know, but maybe someone looking at the photos will be able to recognize the mechanism.
Here is the final result of Sencor restoration with a bit of extra beautifying:
Below are my efforts to restore S-4800 to its original state,
S-480 schematics can be found here: S-4800schematics