If the spool doesn't turn, you probably have the machine in receipt mode so it feeds out the front to issue receipts for customers. Set the programming to journal mode instead and the motor will start turning the journal takeup spool.
If the drawer opens sometimes, then it is probably a sticking drawer latch, or something jamming the drawer. The drawer gives very few problems on these, so look for something bent or damaged. Make sure it is rolling freely etc.
NOTE: if you are going to use this machine to print a journal (every transaction recorded) you will wear out the printer much faster. The printer is a tiny light duty thermal printer and they don't last if you print all the time.
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If anyone needs more information, the Casio TE-M80 manual is here:
http://the-checkout-tech.com/manuals/cashregisters/Casio_TE-M80_users_and_programming_manual.html
Registerman
March 2011