lasonic l30

Below are some radio's I have recently acquired. Clairtone 7979 (thank you THAFUZZ) This box is super feature packed with FM presets and music scan on the cassette deck. Fully working, a 9/10. Stunning box. Lasonic TRC-931 1st generation. This radio is fully functioning, both decks work...

I started to work in a proyect ,whit a Lasonic L30 .i dont need the tape function for this proyect ,so i cut all the wires from deck to the main boar , My idea is only works on radio and line in .but now have a HUMMM when put in the tape selector ,and a liltle humm in the line in mode .any ideas...