Help with Nakamichi RX 202 Static

Hello All,

I have been having a very strange problem with my Nak RX 202 tape deck. When I use the record function on the deck a faint static gets transferred to the tape along with the recording signal. I tried with no input signal to the tape, i.e nothing in the input jacks and just pressed the record button and let it record for 30 sec. But again, when I playback that 30 sec tape, a very faint static could be heard.

I cleaned and de-magged the heads. But no improvement. The sound quality of the recording is good, but can hear the static during quiet passages.

Anyone know what could be causing this?

Regards