Bars, Peace,
What I am about to say, you need to follow step by step.

1. On your MPC200xl Take the Main volume knob and turn it 12 o'clock so it hits right in the middle.

2. On your Record player cords I know you will have RCA jacks, now you must take those and put them in RCA to TRS convertors. Take the end of the TRS which is quarter inch jack and stick those in the back of the MPC, RECORD IN= LEFT AND RIGHT Then, Press shift and #4(Sample) and the screen should come up. Play your record and you will see the meters jump passed the level Meter threshold. Leave the Input on Analog. Never record when the threshold hit all the way to the end, this causes distortion. Now on the MPC you could turn up Record gain, I personally leave this off because it picks up a lot of air. Set your time from 10.0s= seconds to whatever time you want other than ten seconds. You should be good.