Re-set 'Video Setup Page' in Main Setup Men...

I hope you can help me. My Home Theatre System (Telefunken THT-160B) has been working perfectly for the past 2 years, when I decided to change some settings.On the 'Video Setup Page' I accidentely changed the 'Component' from 'Off' to 'RGB'. Then I changed the 'TV Mode' from 'Interplace' to 'P-Scan'. Now I have a colorless (black) TV display (on AV1) instead off the Telefunken logo on a blue background. When pressing the 'Setup' button on the remote it would not display the menu on tv. How do I view the 'Setup' menu to correct these setting or do you have an alternative solution? Or is there maybe a reset button on the system? Thank you.
Kevin