Phomemo Thermal Label Maker M421 Bluetooth Portable Business

1. Please make sure Bluetooth is turned on in the "Quick Switch" or "Control Center" page of your phone, and then connect the printer in the "Main Printer" application. 2. Please make sure that you have obtained all permissions when downloading and installing the application, if not, please enable it in the "Settings" of the phone system. 3. If none of the above methods work, use a thimble or similar tool to poke the reset hole next to the power port and try to restart the printer and phone.

1. Confirm whether the paper roll is thermal paper: Thermal paper can only be printed on one side. Use your fingernail or any other sharp object to scrape the paper. If any color appears on the paper, it is thermal paper. Install this side facing the print head. 2. Clean the print head using an alcohol cotton pad. Make sure there is no dirt or adhesive residue on the print head. Allow the print head to air dry and then try printing again.

1. Make sure the paper roll is installed correctly by checking that it is installed on the right side of the printer (required for M110, M120 only) and pulling the paper roll to the paper outlet. 2. Try cleaning the printer sensor with an alcohol-based cotton pad. 3. If it still doesn't work, follow the steps below: First, remove the paper roll inside the printer then turn the printer on.Second, close the printer cover, press the power button to select the firmware version, and then press the paper feed button to confirm.Third, reinstall the paper roll for printing. 4. Please connect the printer to the Printer Master, when the App prompts the label paper abnormalities, please click [not yet resolved], and then according to the prompts to remove the label and close the printer cover, click the bottom of the App under the boot state [reset], wait for 5 seconds, restart the printer, and then reinstall the label to see if the printer is normal recognition of labels.

1. When the print is not clear, increase the print consistency through Printer Master before printing and then try printing again. 2. Try wiping the printer print head, especially the black line, with alcohol pads to make sure the print head is free of dirt. 3. If the anomaly still occurs, try printing on a different roll of paper, as it may be affected by moisture and affect print quality. 4. Please check the power supply of the printer. If the power is less than 30%, please charge the printer for 3 hours and then print the label to check the printing effect. 5. Please note that poor image quality also affects print quality. For example, an image with a white background color will print with a lot of spots or lines when the image quality is low.

1. Please make sure that the label size you set on the APP is the same as the actual label size in the printer, the outer label packaging already identifies the size of the label, or you can use a ruler to measure it. (Just like your paper is 40x30mm, then in APP you need to choose 40x30mm corresponding template) 2. Please check the template settings in the APP or click the printer power button to see if the paper type is correct. You will need to select the appropriate paper type, Gap Paper/Black Label Paper/Continuous Paper, etc. 3. Please reinstall the roll, making sure that both sides of the stopper are securely fastened to the right side. Please note that the arrows on the retaining plates on both sides of the roll holder need to be installed facing upwards. 4. If the above methods do not solve your problem, try cleaning the printer sensor with alcohol-based cotton pads.

1. Please try using another charging cable and a 5V-2A charger to charge the printer for an hour before powering on again. 2. Before the printer is fully charged, check the printer's battery level, and check the battery level again after using it for half an hour. 3. While charging, use a paperclip or a similar tool to press the small round hole next to the charging port. Restart the printer after charging for half an hour.

1. Please check whether the paper roll holder is installed too tightly or the paper roll core does not match the holder, note that the paper roll cannot be loaded into the holder when the paper roll core does not match the holder. 2. Pull the paper roll to the paper outlet, at least 1 cm beyond the outlet, and try to press the paper feed button to see if the printer dispenses paper normally. 3. Try printing on another roll of paper and check that the printer is printing properly. 4. Press the reset button next to the charging port with a safety pin. If the reset is successful, the printer will power off. Please turn it on again and try printing.

1. Before installing the driver, connect the printer using the data cable that came with the printer when you purchased it. After a successful connection, make sure that the data transfer symbol will appear in the upper left corner of the printer screen. 2. Please click https://phomemo.com/pages/drivers Jump to the download page of our official website to select the corresponding driver or APP for your printer to download and install.