Example picture of printing garbled characters
Some times you may find the printing becomes garbled characters as
above picture show, in this case, you need to reset the printer to get it initialized.
① Press and hold the paper FEED button on the printer.
② While pressing and holding the paper FEED button, turn on the power switch.
③ When the indicator light flashes in BLUE twice, release the button immediately,
the printer starts initializing. A few seconds later after finishing initialization,
the printer will restart by itself.