I have a JVC GR D30 that starting exhibiting the following problems: During play back you can hear the sound but no video is displayed. This is true for any tape you put in. A few weeks ago a message appeared that the heads needed cleaning. I bought a cleaning tape and ran it through 3 cycles but no good. No I can not tape at all as nothing is displayed in the window when the unit is turned on. Any assitance is very much appreciated. Thanks Gary

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