OK!
Thanks for those constructive answers.
Since I did not know exactly where to look and since everyon told me the thing was about due for the dump, I did what the self-learned mechanic I am always did to learn how things work : I pulled the whole thing appart, looked how I tought it was supposed to work, and pulled it back up.
Jameswei : there is no spring, there sould'nt have been any kind of float. The motor is mounted on rubber bushing, and what I tough to be a float was just the motor being loose on its bracket. Now it's tighten, it moves only by what is alowed by the three-points bushing.
Also, the motor is back up to right height, so the belt does not rub on the rake anymore : SILENCE!
Speed is also right since the belt centers well on the motor shaft.
Finaly, I took the head of, cleaned its contact points, clands the cartridge and stylus.
It now sounds OK. Not great, but as it should considering the old cartridge.
No need to throw away the Sansui. Some of you would because not satisfying, but I wanted something cheap to get me started, that is now what I have, and it works.
Thanks to those how hepled :-)
Thanks for those constructive answers.
Since I did not know exactly where to look and since everyon told me the thing was about due for the dump, I did what the self-learned mechanic I am always did to learn how things work : I pulled the whole thing appart, looked how I tought it was supposed to work, and pulled it back up.
Jameswei : there is no spring, there sould'nt have been any kind of float. The motor is mounted on rubber bushing, and what I tough to be a float was just the motor being loose on its bracket. Now it's tighten, it moves only by what is alowed by the three-points bushing.
Also, the motor is back up to right height, so the belt does not rub on the rake anymore : SILENCE!
Speed is also right since the belt centers well on the motor shaft.
Finaly, I took the head of, cleaned its contact points, clands the cartridge and stylus.
It now sounds OK. Not great, but as it should considering the old cartridge.
No need to throw away the Sansui. Some of you would because not satisfying, but I wanted something cheap to get me started, that is now what I have, and it works.
Thanks to those how hepled :-)

