Lexmark C720 User's Guide - Page 125
Removing the optional duplex unit
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3 Remove the toner cartridges (black K, yellow Y, magenta M, cyan C) from the printer. 4 Cover the end of the toner cartridge with clean paper. WARNING: Do not touch or scratch the surface of the glossy green glass on the toner cartridges. Touching the glass may damage it and reduce print quality. Do not leave the cartridges exposed to light for more than 5 minutes. Leaving the cartridges exposed to light for more than 5 minutes may damage them and reduce print quality. 5 Place the toner cartridges in a box or cover them. Removing the optional duplex unit Note: Removing the optional duplex unit is easier if you have access to the rear and sides of the printer. 1 Remove the right side access panel. a Pull the front of the panel (1) out slightly. 125