the daisy wheels should be replaceable
which means it might have come loose. or the wheel itself might be broken.
They are typically made of plastic and if it ripped it might not spin properly
I can try to get you a manual if you need it but its usually pretty easy to see how the wheel comes off
take it off and look at it for problems such as the place where the spoke goes through to spin it is ripped or stretched so that the spoke cant spin it properly
As i said if there is a problem with it they can be replaced pretty easily