Lasonic L 30 HUMMmmmmmm

[chevyman-uy]

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 where is the problem? when aproach my hand close to the rec/play the hummm is more .any help is welcome ,

 

[floyd]

prolly one of the ground wires from the deck causing that hum .

 

[chevyman-uy]

prolly one of the ground wires from the deck causing that hum .

Thanks ,is a good point to star ,any help to find the deck ground ,? the most wiresof the deck are disconected when i open the box ,

 

[floyd]

should be a black wire with a ring terminal on the end that screws to the metal chassis of the decks.

 

[chevyman-uy]

the deck are just decorative ,dont have any conecction to the boar maybe need know where the groud wire is conected

 

[Alberto]

Maybe look for this, the muliti-conductor wire that goes from board to tape head for L+R signal has a shield that has to be connected to metal ground.