Panasonic NV-MX7 Mini DV Digital Camcorder "f05 screen" Questions

post back with model details :) The camera won't work but the zoom feature still functions and "F05" displays on the LCD screen and the red light indicator flashes? What can I do to solve this problem

F05, cylinder lock? We have about 20 of these cameras in service in a college educational setting and practically all of them, save 4 exhibit the cylinder lock error. What exactly does this error mean