English The roll paper cover will not open Turn on the printer and remove the cutter cover. To remove the cover, use a tool such as a screwdriver, and insert it into one of the slots indicated by a circle in the illustration below and push the cover upward. After removing the cutter cover, use a ballpoint pen or tweezers to turn the knob in the direction indicated by the arrow until you see a triangle in the opening. Cleaning the Print Head CAUTION: After printing, the print head can be very hot. Be careful not to touch it and to let it cool before you clean it. Do not damage the print head by touching it with your fingers or any hard object.
Turn off the printer, open the roll paper cover, and clean the thermal element of the print head with a cotton swab moistened with an alcohol solvent (ethanol or IPA). Epson recommends cleaning of the thermal head periodically (generally every three months) to maintain receipt print quality. . TM-T90 User’s Manual 11