I have a Canon PIXMA MP780/MP750 Printer. Until recently it has produced beautiful color prints. I replaced the BK cartridge, went through all the maintenance, cleaning, deep cleaning, alignment, etc. Color is primarly blue, green. No red, little yellow. At my witzs end.

Solution

1. Press START - Devices and Printers
2. Right-click the Canon MP258 series - select Printing preferences
3. Click Maintenance - Cleaning
4. Select All Colors BK, C, M, Y - Execute
5. Wait until the process is finished (Do not start another operation until the cleaning has finished).
6. Click Print Check Pattern OK




If the results print out like this, there are two possibilities:
1. Red ink in the cartridge runs out. Solution: injecting with red ink
2. If the red ink has been filled, and check pattern is still not out, meaning the color cartridge error. Solution: replace the cartridges

Hi,

May i know if you use an original ink for your printer..?

Have you checked to see if the jet area on the bottom of the ink cartridge has a blackish sludge on them? It might be that the area that the print cartridges are purged/cleaned to one side of the printer (sometimes called a service station, or spitoon) has built up excess ink that has gotten thick and high enough that as the carriage goes over that area the bottom of the cartridge gets polluted with the blackish sludge. It will work slightly into the jets where the ink comes out and cause discoloration, even after you change the color cartridge. Open the unit to look inside with a flashlight for build ups and clean it (if you find some) with disposable things like cotton swabs, coffee stirrers, whatever you have that wont damage anything inside. Another cause could be mixing of the cyan and magenta and yellow somehow inside making a dark color representing black - but replacing the cartridge would cure it immediately.

Hi,

There seems to be a calibration problem. Follow the calibration test from the manual.

If you are using original cartridges, go to canon for repair.

Cheers
TeaCii
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Here is the Canon WEBSITE for the PIXMA. Your can find manuals, drivers, specifications, etc. here.

This is where the serial number is located, look here.
Locate the Serial Number The serial number of the PIXMA MP750 / MP780 is located at the back of the printer towards the bottom edge, as shown below.

• The serial number for the MP750 starts with three letters (AGA) and ends with six numbers. Example: AGA012345
  
• The serial number for the MP780 starts with three letters (AHB) and ends with six numbers. Example: AHB012345
  
  

good luck

I think you are seeing "ERROR 5100: Cartridge Jammed", right?. Here is the most likely solution to this issue with your printer. The following procedure comes directly form Canon
ERROR LCD: CARTRIDGE JAMMED

1. Press ON/OFF switch to reset the multifunction device 2. Removing obstructions, foreign objects and paper jams MP750 / MP780 3. Reseat MP750 / MP780 print head 4. The MP780 may require repair

I just bit the bullet and went out and bought Canon ink and replaced all my other Print Pal ink cartriges and my printer works like a charm again.

you cant print without color cartridge

when they say TONER , its refering to the INK CARTRIDGES , Color & black ,
CANON PIXMA MP780 & MP750 uses the same INK CARTRIDGES :
BCI-3eBK for BLACK & BC-31C for color

please rate this solution , hope this helps

PIXMA MP780 "WRONG CARTRIDGE" MESSAGE?
Here is what I did and it now works just fine.I turned off the printer and unplugged the power cord, and unplugged it from my computer. I then removed all the ink cartriges and removed the print Head I got some rubbing alcohol put it on some toilet paper and wiped down the back and bottom of the print head.Plugged everything back in and It now works better then ever.