Bartender is not a barcode printer model, but a barcode software. Look at what printer it is. Generally, when changing paper, the printer should pay attention to the label face up and touch the carbon tape face with the carbon face. Second, the label paper can only be detected by the sensor. Generally, there will be a label winding diagram on the printer, which can be followed. The pause key is the pause key and the paper feed key is the paper feed key. Under normal circumstances, press the two keys together to restore the factory settings, press the pause key to measure the paper, and press the feed key to print the test page. There are also differences. You can try it yourself according to the type of printer.