According to the working principle of the camera (mounted on the film, the motor will film all out again, when taking a rollback cassette) analysis, should be the rewind film action problem. After careful observation, fault to rewind to foot square mouth parts wear, stuck to the volume does not a cassette shaft, the motor will not film rollback cassette, control signal is confused, the camera can not normal use. Rewind to repair foot, in turn casters party mouth pad a small slice, the foot can move up and down, and can be turned casters stuck, troubleshooting.2imservice manual download site