Hello sir/maam, most (almost all) mic are mono, and the microphone mixer circuit splits the signal to two channel left and right, and fed to two amplifiers, then to two speakers. IF by any chance only mono, we need to trace the path where the mic signal is fed, and where the signal dissappeared, check also your balance control.
If your mic mixer circuit is designed for one channel, contact your local tech to check out or make connection to both channel.
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