Question about Canon PIXMA MP780 All-In-One InkJet Printer
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.
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
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
Here is the service manual for your printer
it has trouble shooting and step by step repair instructions
Posted on Dec 31, 2007
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Posted on Jan 02, 2017
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