I am very happy to tell you that my JVC GR-DVL805u has been sitting around not working for a couple of years. Every 6 months or so I would try it to see if the EO4 error message would go away by itself. This time I stumbled onto the "beat the hell out of it" technique. I can't believe it, but the camera is working perfectly now. If and when the problem comes up again you know what my first repair procedure will be. Thanks a lot. John

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