My 7" singles play all at 45 RPM. Maybe the turntable needs some oil for lubrication because it was a long time whitout use or maybe there is something wrong with the internal mechanism. But anyway I think it is strange because my LPs play fine... well, in fact the LPs goes a little slower than the CD versions, but it is almost imperceptible and the only way to realise that is playing both turntable and the CD simultaneously. Actually I don't know if it is the way that it supposed to be or there is something wrong.
(By the way, the turntable is a Pioneer PL-7, from 1982 I think)...

Any suggestion?

Thanks again.