* Ribbon installation is incorrect.
* Media installation is incorrect.
* Print density is incorrect.
* Media feeding is incorrect.
* Please set the suitable density to have good print quality.
* Make sure the label guide touch the edge of the media guide.
Gray line on the blank label
* The print head is dirty.
* The platen roller is dirty.
* Clean the print head.
* Clean the platen roller.
* The printer is in Hex Dump mode.
* Turn off and on the printer to skip the dump mode.
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