Hey Chris,
Welcome to the forum.
Some more details would help in figuring out what's going on.
For instance, does the pinch roller press the tape against the capstan?
Does the capstan turn?
Does it move at all in play? Or make sounds like it's trying to play?
Does the tension arm move up and down freely?
Some of these things stop working correctly on Teacs because the lubricant that they used on these has a tendency to harden after a while and jam up the works. Some of these things like the pinch roller can sometimes be freed up manually (moving it up and down by hand) but eventually, they need to be disassembled, cleaned and lubricated.