Blaupunkt peugeot stereo

Question

Hi
Just bought a new car with this stereo in it model 7648146392 serial no. BP8146X239552 but it has no instructions and I cant get the volume any higher than 8 and it will only let me try the volume as and when it wants. I dont think the buttons are working all the time, but it could well be that I am doing it all wrong. I cant seem to operate the cd change either, it wont let me forward or rewind a track. Do you think it has had it or is there a special way to use this stereo. Be grateful for some expert help before I fork out for a new one
Thanks
Jan