I have JVC GR-DVM70 U MiniDV camcorder. It's rarely used in the 4 yr. period I've owned it. I used it the other day to record and on playback the sound was intermittent at first and after several reruns full sound returned. I tried a dry tape head cleaner and now it doesn't have any sound. The picture plays back fine just no sound. What are the possible problems?

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