First thing is to make sure the snatch plug contacts are clean. Next take your multimeter on the ohms range and measure continuity between plug and each headphone. Then check continuity between each side of each earpiece. If there's no reading on any circuit then most likely an open coil. The earpieces are wired in series from pin 2 to one side, a jumper between earpieces and other side going to pin 3.
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