I assume you have connected your Argon turntable to PHONO input via an rca - DIN adapter. This should work, if your Argon has an inbuilt RIAA preamp. If this is not the case you can connect an external preamp.
And be aware that DIN plugs in all Beomaster have four connections - two inputs (left, right) two outputs (left, right). Maybe you have connected the Argon to the outputs....(?)
BTW we are in the scandinavian forum, so this is the "wrong" language - sorry
Stefan