Note• If the Tab Selection screen is not displayed, press the Menu button.2 Press the OK button.The Set./Adj. Menu is displayed.3 Press ▲ or ▼ to select Maintenance, and then press the OK button.4 Press ▲ or ▼ to select Head Cleaning, and then press the OK button.5 Press ▲ or ▼ to select Head Cleaning A or Head Cleaning B, and then press the OK button.Head cleaning is now executed.6 Print a test pattern to check the nozzles, and determine whether cleaning has cleared the nozzles. (See"Checking for Nozzle Clogging.") ➔P.585Replacing the PrintheadReplacing the PrintheadWhen to replace the PrintheadReplace the Printhead in the following situations.• If the printing quality does not improve even after one or two cycles of Head Cleaning B from the printermenu• If the Display Screen indicates "Open top cover and replace the printhead."• If your Canon dealer has advised you to replace the PrintheadCompatible printheadsFor information on compatible printheads, see "Printhead." ➔P.585Precautions when handling the PrintheadTake the following precautions when handling the Printhead.Caution• For safety, keep the Printhead out of the reach of children.• If ink is accidentally ingested, contact a physician immediately.• Do not touch the Printhead immediately after printing. The Printhead becomes extremely hot, and there is a risk ofburns.Important• There may be ink around the nozzles of the Printhead you remove. Handle the Printhead carefully during re-placement. The ink may stain clothing.• Do not open the Printhead pouch until immediately before installation. After removing the Printhead from thepouch, install it right away. If the Printhead is left after the pouch is opened, the nozzles may dry out, which mayaffect printing quality.Access the menu for Printhead replacementCaution• When replacing the Printhead immediately after printing, wait a few minutes before replacing it. The metal parts ofthe Printhead become hot during printing, and there is a risk of burns from touching these parts.Important• Your hands may become dirty during Printhead replacement. Use the gloves provided with the new Printhead forreplacement.Note• Prepare a new Ink Tank when ink levels are low.• When the remaining capacity of Maintenance cartridge is low, prepare a new Maintenance cartridge.iPF850 Replacing the PrintheadUser's GuideMaintenance and Consumables Printheads587
