An excerpt from
http://www.techlore.com/article/10974/JVC-Camcorder-Stuck-in-Safe-Mode/:"JVC notes that you are also given a malfunction code when the unit is placed into safeguard. If it displays code 01, 02, or 06 you should remove
the battery and powersupply and wait for a while. Code 03 and 04 indicate that you should eject and reinsert the tape.
If neither of these solutions work, your only alternative is to bring it to a shop or send it to JVC for diagnosis or repair. Unfortunately, there is no other way to clear the condition."
According to this, E04 denotes a problem with the recording media or the mechanical bits that deal with the tape. Hopefully trying another tape helps.
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