Abnormal power failure in printing, after re-powering the printer will return to normal operation on its own, do not force to take the paper, it will lead to machine damage. Abnormal power failure during the upgrade, the printer will return to normal operation after re-powering, just re-upgrade the firmware version. Other abnormal states re-switch the printer on and off to resume normal use. (Please ensure that the cassette is installed in place, the cassette is not installed when the machine can not perform automatic reset or self-test procedures)