Question about Canon PIXMA MP780 All-In-One InkJet Printer

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Printer dead Hi, Periodically, my printer would make a loud noise when it's turned on, and it would not work. But, this time when we turned it on, it just simply dead except there's a black line appeared on the LCD. We unplugged and plugged it again at different places, yet, it appeared the same. We've used this printer a little less than 3 years. Could you please tell me what to do? Thank you Li Chen

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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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