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

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Makes a loud clicking noise and reads scanner error.

When I turn the machine on,it makes a loud clicking noise and reads scanner error. Alarm button is flashing. Then it reads "Load paper, press OK" It alternates with the two messages. By the way, there is plenty of paper.

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  • thedread Jan 07, 2008

    same here

  • Anonymous Jan 24, 2008


    1. I have the same problem with the pixma mp780

    2. It reads "scanner error"

    3. It makes the loud clicking noise

    4. it shows the printer with the lid open, showing the chain below the glass

    5. nothing prints from the scanner

    Thank you, Bridget bridget263@cox.net

  • Anonymous Mar 18, 2014

    When copying the paper will not feed although the machine makes the right noises. An error message says that it is out of paper, to load some and press ok.I have run the print head alignment program and the 2 sheets of paper fed through ok. It still will not copy. Can you help?

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I had this exact problem. This printer was given to me, so I didn't have the instructions. I'm pretty sure I damaged it when I tried to open it to change the ink. I didn't realize there was a lever. After I got it open, I had trouble closing it, but eventually I got it to sit down flat. It was after this that the scanning function ceased to work as described by others.

I searched online to find a solution, but was hesitant to buy a repair manual. I read about someone else who took the unit apart. His experience was really a help as he knew just what part to take off. You need to remove the gray panel on the right side of the unit (as you are facing the front). This is the side with the USB port.

There are only three screws to remove. I used a flat head screw driver to gently pry the pieces apart. There are two places it snaps together on the bottom of the unit. I was able to get it apart without damaging anything. Once it's open, you will be able to see there are a few ribbons that connect the top of the unit to the circuit board in the base. For me, two of these had come loose. I simply slid them back in the slots where they seemed to belong and put the thing back together.

It was easier than I imagined and it worked! Good luck.

Posted on Mar 16, 2008

  • Mac Gordon Jul 23, 2012

    I spent the better part of a full day trying to diagnose and repair the same condition with my trusted MP780. Finally I came across these repair steps and as the saying goes, "the rest is history". The only thing is I had to remove (2) screws to get the cover off; not (3). Many thanks.

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This is what I found in a scanner-copier. The moving bar of the scanner has a flat tab that fits into a slot that has a very small light in it. That tells the bar to stop. When dust collects in the slot area, the light can't see the tab, and the bar bangs into the end, and the belt jumps and makes noise.. Blow out the dust.

Posted on Mar 28, 2008

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Here is the service manual for your printer

http://www.nodevice.com/manual/newmans/1164257699mp750780smpdf/get13922.html

it has trouble shooting and step by step repair instructions

Posted on Dec 31, 2007

  • Rishi Roshan Ali Jan 07, 2008

    miss ? why did our rate me as inappiorate ? the service manual is a detailed manual with troubleshooting and how to fiax anything that could go wrong with your printer. ehat happend to your printer if you read the service manual is that the carriage motor is stuck. you would have found this in the manual and the steps necessary in taking the maching apart to fix the problem.



    If you wish to try something else first, the service manual would have suggested that you click START/PRINTER AND FAXES and double click on your printer, then cancel all pending jobs. restart your computer then your machine.



    I seriously doubth that what i said was inappiorate. If you still think it is please let me know why so that i can try to do better next time. Thank you kindly .


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