Akg P420 grouploop promblem

[yuaylooper]

Brother , what the screw ? i need to tight it ? Or cleaning the colour on it to stop groundloop promblem . I’m fear to do . Somebody please help me to comfirm . I dont understand the Fix with text

 

[yuaylooper]

promblem gone when i touch it’ hard but some time i move a mic or remove fromstand . Issue have come TT

 

[micolas]

On my black P420, with fine sandpaper I cleaned the paint a little in some places, for a better electrical contact, I tightened the nut well and the hum disappeared

 

[k brown]

Grouploops was my favorite cereal as a kid.

 

[yuaylooper]

On my black P420, with fine sandpaper I cleaned the paint a little in some places, for a better electrical contact, I tightened the nut well and the hum disappeared

Thank Micolas , can you explain " scartch some Places " it .... like this ?

i'm newbie sorry for stupid question , i'm fear and Care to work with PCB or Electic

 

[yuaylooper]

Grouploops was my favorite cereal as a kid.

Sorry Sir , My Bad

 

[yuaylooper]

Where should I start the First nut ?