E04 error on my JVC GR-AX55

SOURCE: E04 Error

WOW! At first I thought this was a joke but it did work! Thanks.

SOURCE: E04 Error

Eject tape leaving cover open and remove battery. Re-insert battery and re-insert tape also leaving cover open. Keep repeating this process until eo4 message disappears. This worked for my GR-DVL100e after about four repeats. After getting your camcorder operational, they say it is good practice not to leave tape in camcorder when not in use.

SOURCE: E04 Error

i had the same problem with my cam JVC GR-DVL309 and i solve it.
HOW!
Eject the tape, reinsert it BUT while the tape is going down to read, push the door with your hand just a little bit to right side just a few seconds while is reading the tape and close the door, (i had done this 2 or 3 times) this way i have solve the E04 Error, now i can record and play with my cam.

SOURCE: JVC gr dvl 500U E04...safe gaurd mode/ remove and

Poor contact of drum motor connection(flexi found at the upper part of the drum assy). Solution, disconnect this wire from the connector and cut 1mm from the end so that it will make a new contact. WIre will be shortened a little bit but it still can work this way since this flexi can not be ordered alone, it comes complete with the whole drum assy. Good Luck

SOURCE: JVC GR-DVL100 camcorder fault showing

E04
remove and reattach battery,
Unit in safeguard mode.