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

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Canon Pixma mp780

When I turn the printer on I get a loud clicking noise and it says scanner error. When I try to scan or copy the light isn't moving and it won't copy or scan anything.

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Re: Canon Pixma mp780


thats the service manual for your printer it contains detailed step by step instruction in trouble shooting and repair

Posted on Dec 31, 2007

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My Canon MG8120 all-in-one makes a loud noise when copying (not when printing). How do I fix it?

from the question I understand, the scanner move to right and during return it starts noise.

The problem with scanner assembly, It might be dust accumulated on gears, the scanner belt might have loose or the grips of the belt has worn out. Proper cleaning and lubricating the moving parts may overcome also if the belt worn out it has to be replaced.
In case of at home position it gives noise then the home position sensor may dirty/dusty, it has to be cleaned.


Feb 15, 2015 | Canon Pixma MG8120 Wireless Photo...

1 Answer

Right now, the scanner bar is stuck to the far right and it makes a loud noise like gears slipping. But I would also like a copy of the "Service and Repair Manual" for any future problems.

Hi rksde,

First of all, thank you for purchasing the service/repair manual of Canon Pixma MP780.

Please email me at, manual has 132 pages, it can't be uploaded here.
Again, thank you so much!

Rating and feedback are highly appreciated!

Good luck and have a great day!


Jan 18, 2012 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Canon Pixma MP780 makes a loud clicking noise. No paper jammed anywhere. It seems to be the gears where the cartridges are.

i have th same exact problem, just took much of it apart, bu still cant see why it makes the loud noise, also I cant switch paper feed to back, which at least would allow it to print from there... please let me know if you find a solution.

Nov 09, 2010 | Canon PIXMA MP780 All-In-One InkJet...

2 Answers

Canon pixma mp780 auto feed does not print

You probably need a new printhead, but that problem cann also be caused by the purge or cleaning station not working properly. If you do a cleaning cycle with no carts. and the little pads in the printhead come back with no ink on them then the purge is working and you need a new printhead.

Aug 09, 2009 | Canon PIXMA MP160 All-In-One InkJet...

1 Answer

Printer pixma 780

Cycle throught options until #7 PRINTER
Pres OK
Cycle throught options untill #5 INK ABS CAP
Press OK
Enter 0
Press OK
Turn Printer off
Turn Printer back on

Feb 21, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Canon PIXMA MP780 All-in-One Printer, etc.

Is this scanner installed onto a Vista computer?

In some cases the scan button may not operate without a memory resident program installed.

It will work by selecting my computer and selecting the scanner on the window. By double clicking on it, it will scan whatever is on the glass.

Aug 04, 2008 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Mp780 waste ink full

Enter Service Mode : Menu – Scan – Copy – Scan
Select #7 PRINTER in the service mode, and
input “0” at # 5 INK ABS CAPA.

Jan 18, 2008 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Canon MP780 wont scan

Download and reinstall scanner software and scan driver

Nov 01, 2007 | Canon PIXMA MP780 All-In-One InkJet...

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