Question about Canon PIXMA MP780 All-In-One InkJet Printer
Remove the cartridges and then pull out the print head. Look on the bottom for burned out circuit traces. Canon & HP printers (and some others) are designed to "zap" the printheads with a high current pulse that gradually destroys the printhead circuitry. This is to keep you coming back for more. These guys are greedy beyond belief! If your Canon worked for 3 years consider yourself lucky. This is not the only solution but it is definitely one which applies to this issue. The loud noise is not necessarily related to the black line/bad printhead problem.
Posted on Jul 29, 2008
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