Wow!!! Unbelievable! I have a JVC Mini GR-DVL300U. I kept getting the same error message (E04) of remove battery and insert again...still same error message. I did as your post suggested. I opened the cassette door, removed the battery & opened the viewer. I gave a slight wack. re-inserted the battery, closed the cassette door and started it up. Works just fine!!! Amazing!!! While the procedure is sad...I am delighted to have the camera working before my son's first basketball game! Thanks Ryan

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