I recently got a Tascam TSR-8. At first it was just turning on but no action while pressing buttons.
I opened the front cover, cleaned it up and readjusted the belt, that fell of. Now When I turn it on, rew & ffwd are working but play and/or record won't. Any ideas, what's wrong with this nicely looking machine?

Made a video to show the error:
I'm not yet approved to post video links so I will add it later: Just go on Youtube and search for "Tascam TSR-8 Play/Record not working ".

Glad for every help!