Video camera has built in microphone which is on at all time until you plug in different type of mic then camera is switched to new mic. Audio problem may be on audio head or circuit problem. You can test the system by playing pre-recorded tape to see if it play with the sound and go from there. If it play but does not record sound, you have audio recording problem. If it does not play, I would clean the video head and audio head area good. -James For further assistance, request help at
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