Canon PIXMA MX459 User Manual - Page 211

Key to Enjoying Consistent Printing Quality The key to printing with the optimal printing quality is to prevent the print head from drying or clogging. Always observe the following rules for optimal printing quality. Never disconnect the power plug until the power is turned off! If you press the ON button to turn off the power, the machine caps the print head (nozzles) automatically to prevent from drying. If you disconnect the power plug from the wall outlet before the POWER lamp is turned off, the print head will not be capped properly and this will cause drying or clogging. When disconnecting the power plug, make sure that the POWER lamp is not lit. Notice for Unplugging the Power Cord Important If the power plug is disconnected, the date/time settings will be reset and all documents stored in the machine's memory will be lost. Send or print a necessary document, or save it on a USB flash drive before disconnecting the power plug. Print periodically! Just as the tip of a felt pen becomes dry and unusable if it has not been used for a long time, even if it is capped, the print head too, may become dried or clogged if the machine has not been used for a long time. We recommend you to use the machine at least once a month. Note Depending on the type of paper, ink may blur if you trace the printed area with a highlight pen or paint-stick, or bleed if water or sweat comes in contact with the printed area.