The device keeps saying "Unit in safeguard mode remove or reattach battery or DC unit." I've taken the battery on and off several times and charged it all day.

SOURCE: Error message: E03 Unit in Safeguard Mode - Remove and reattach battery

HI, ERROR CODE E03 MEANS THE THE TAPE IN YOUR CAMCORDER IS TOO SLACK, ALL YOU NEED TO DO IS EJECT THE TAPE & TIGHTEN IT USING YOUE THUMB LIKE I DID, ONCE I PUT THE TAPE BACK IN THE ERROR HAD GONE ( FOR EVER I HOPE!) GIVE IT A GO ANYWAY, HAYLEY X

SOURCE: E04

Here's what i found. I was able to clear the message by opening and closing and ejecting the cassette. I also had to play with the battery at the same time. Keeping the cassette door open and then pulling out the battery. After is did this a couple of times i got the message to clear. I too haven't used my camcorder for some time and now that the error message has cleared the camcorder tells me that i need to clean the heads. Hope this helps. Below is the message i found that pointed me toward ejecting the cassette. An error indication (E03 or E04) appears. - (E03 or E04 UNIT IN SAFEGUARD MODE REMOVE AND REATTACH BATTERY) This massage a malfunction of some kind has occurred. In this case the camcorder's functions become unusable. - Eject the cassette once and re-insert it, then check if the indication clears. When it does, you can resume using the camcorder. If the indication remains, consult your nearest JVC dealer or service center

SOURCE: safeguard mode error 06

Defective mechanism,
a stucked mechanism is
present. camcorders are
smart. it can detect error
and shut down itself for
safety. earlier models
domino the defect if
the user is not quick
enough to react when
something goes wrong with
the camera. You need
professional service to
fix it.

SOURCE: Error message: E03 Unit in Safeguard Mode - Remove and reattach battery

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SOURCE: Shows fault E04 remove & reattach battery

Do a search of this problem and you will ind that every JVC owner is having the same problem. I finally got mine "reset" by powering the unit on in payback mode while holding down the "play" button. Then, turn it back off and power it on in the camera mode while holding down the "rec" button. This seems to have reset it and I've not had anymore issues SO FAR!
Good luck with it.