Harman Kardon HD970 buzzing output

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Hi All,


My HD970 cd player analog output is buzzing when connected to my integrated amplifier or ant other sort of amplification (tried it on portable speaker).
Even when I removed the main board completely from the cd player and connect it's outputs to the portable speaker I still get a buzzing sound.


The only time that I didn't get this buzzing sound was when I connected the cd player to the portable speaker and the portable speaker was powered by it's built in batteris, as soon as I connect the portable speaker to a wall outlet (any wall outlet) I get the buzzing sound.


Do you have any idea what do I need to look for or how can I fix it?


Thanks
 
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