The preferred approach is to run a ground cable from the turntable to the ground post on the back of your preamp or receiver. This keeps buzz and hum out of the audio signal. If your receiver doesn't have a ground post, you'll have to connect the ground to one of the RCA signal jacks. In both cases the question is, when you have two grounds, which one to connect? You'll have to determine this by trial and error. My guess is you'll get the best results by connecting both, so start with this arrangement. Connect the turntable's audio cables from its RCA jacks to the receiver, select the phono input, and turn it on (with the volume turned down). Turn up the volume until you can hear hum or buzz. Then connect a piece of wire to the ground post on the turntable panel and touch the other end to the ground post on the receiver or to the RCA jack/plug's outer ring. If the hum/buzz goes away, you're good to go and can connect the wire permanently. If not, try the ground cables individually and use the connection that works best.
SOURCE: Ion ttUSB turntable fault
The ION should be internally grounded, however, it's possible the Tonearm might be faulty as well. Try a different USB cable as well - make sure you have one rated for the type of USB card you have (1.1, 2,0, etc).
FYI, this isn't the most sophisticated unit on the market, and not very well made either, so you might just have a faulty unit. If it's relatively new, I suggest calling in for warranty info, or try and return/exchange it.
- TWEAK AV LAB
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