Sony VGC-RM1 - Manual (Page 145)

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Troubleshooting
Microphone
What should I do if my microphone does not work?
If you are using an external microphone, make sure the microphone is turned on and is properly plugged into the microphone
jack on your computer.
❑ If you are using an external microphone, make sure the microphone is turned on and is properly plugged into the
microphone jack on your computer.
❑ The muting button on the keyboard may have been pressed. Press the button once again.
❑ The volume may have been turned off with the volume control on the keyboard. Turn the control clockwise to turn up the
volume loud enough to hear sound.