Try searching Beogram RX2 here in the forum, and you will find a lot of threads about your BG, but you will have to do a good cleaning (also contacts), maintenance and lubrication and maybe a new belt.
Beosound 3000, BL 4000, BL 8000, BG 2404,BG 5000, BG CD50, Beocord 5000, BM 901, BM 2400, BM 4000, BV S45, BV 3702. There is nothing we cannot do, but a lot of things we don't want to do!!