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There are a few possible causes to the lack of text when printing from the phone.
To narrow down possibilities, first perform a nozzle check. If the black net pattern does not show up at the top, then the ink used for standard black text printing is not flowing, and the black ink cartridge will need a print head cleaning or to be replaced.
If the black net pattern shows up on the nozzle check, then the next most likely cause is a paper size mismatch. Double-check the paper settings in the app or print window on the phone, and ensure it matches the size of paper registered on the MX432.
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09/26/2023: New firmware updates are available.
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