If the DC socket is dirty, it can be cleaned up, and the specific DC outlet cleaning method is still to be studied to avoid the wrong cleaning of the DC socket which can not be used normally.
General headphones have broken, murmurs, or woofs missing when they are generally considered, probably due to the above reasons. First, open the headset shell, take the soft set of headset down the soft set, then use the sharp tweezers and other sharp tools to pick out the iron net and steel mask, until all the membrane is exposed. Hard shell earphones can be first used with a flat screwdriver to lap the joints, then generally open easily, and eventually expose all the membranes. Big headphones are different. In short, all the earphone films should be exposed to facilitate operation.
Membrane collapse, for the collapse of the membrane, tweezers can be clipped with a small piece of double-sided adhesive, gently put the place where the film collapse. Pay attention to the size of control. The membrane can be returned to the original sample after recovery.
Membrane cracking is unlikely to repair, even if sound quality is repaired. However, the sound quality damage is very slight and can be neglected. That is, dip the needle with a 704 glue (also called vulcanized silica gel) and apply it to the crack. Be careful not to be too thick to cover the cracks. And then load the shell. Remember not to listen immediately. You should try two days later. Because the silicone rubber is dried slowly.
Peel off the membrane and smear it with 704 or fish ball glue. Pay attention to sticking and pressing. Put back and place it for a day.
Iron powder, dipped in cotton swabs and iron powder, then deal with the film collapse.