Bang & Olufsen Beogram 1700, not switch from 45 to 33 rpm

Buonasera,cerco consigli riguardo la riparazione di un 1700:non commuta da 45 a 33 giri nell'immediato,devo spingere diverse volte......ringrazio in anticipo

Good evening, I am looking for advice regarding the repair of a 1700: it does not switch from 45 to 33 rpm immediately, I have to push several times. Thank you in advance!