Hi, there, I have a Jensen JTA-230 3-speed stereo turntable. I don't see any mention of a switch on the unit, nor does the manual mention one (the manual just says to connect to the receiver using RCA jacks...which I am first connecting to a phono pre-amp). To your point, I would think that, with the RCA jacks plugged in, sound should at least stop coming out of the record player's built in speakers, regardless of any user error " downstream" with my set-up preventing it from reaching my speakers via the receiver. Given the unlikeliness of a defective unit, there must be some user error I'm not seeing.