hifi engine

Onkyo Integra TA-2047 cassettedeck

today i bought a Onkyo Integra TA-2047 cassettedeck at a fleamarket.
Verry nice decj, but the play function doen't always work.
FFW and REW does work great, the belt issn't broken or something like that.

Waht could be the problem?

does any one have a manual and service manual for me of this deck?

thanks!