NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual page 46

Figure Section 2-8 Inserting the microphone into the holder
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Adjust your microphone by pivoting it up and down and side to side (see
Figure Section 2-9).
Figure Section 2-9 Assembling the Microphone Holder
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Plug the microphone into the microphone in jack at the rear of the system (see
Figure Section 2-10).
Setup and Operation 2-7