I purchased an AW 771 set in 'as is' condition which on arrival produced output only from one side. Repair was effected by removing 8 phillips screws, 4 from each side, concealed under the ear-surrounding doughtnut-shaped cushions. To expose those screws, the ear cushions must be pushed from their center toward the outside. Black screws in back holes surrounded by black acoustically-transparent cloth does not make them obvious. I used a volt-ohm meter to find a discontinuity at a failed solder connection.

Resoldered that connection, rechecked electrical continuity to be certain all connections were good. Tested with batteries installed using an audio input. Both sides produced sound. Replaced screws and they have performed very well since then. I hope this Model AW771 experience is helpful in restoring your AW-721 to working order.

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