Beocord 2000 and 3300 cassette decks; If you can hear the motor running by placing your ear to the deck but the tapeheads won't engage (or has become stuck with a tape loaded),
the deck is begging for new belts.
This also applies to the Beocord 6000, 6002, 8000, 8002, 8004 HX-PRO and 9000 as well as the Beocord 5000 of the 1980's stacking system.
Belts are still available and mounting instructions can be included, also containing information on how to unload an eventual stuck tape without damaging anything.
Martin