Kerplunk94

My turntable is always quiet because i can't turn it up because of this really loud obnoxious humming, it might be something to do with the ground wire but my technics system apparently doesn't need a ground wire btw i have a technics sl-j110r

i have a Technics turntable sl-j110r, tuner st-x902l, amplifier su-x520d, sound processor sh-e85 At first i played my records and it sounded fine but recently my turntable is a lot quieter than everything else. I changed cartridges and stylus and still sounds the same. please can anyone help