The cartrige is what holds the ink, the printhead is the device that puts the ink onto the paper.
So if your out of ink, then you need a new cartridge, if you have a new cartridge and you are having issues printing good quality, then you may need a new printhead.
you can get the ink here: http://printerinkcartridgesearch.printcountry.com/canon-pixma-mp830-ink-cartridges.htm
printhead is about 49.95
http://www.precisionroller.com/k_canon_pixma_mp830_print_head/m114d8577c104/
Hope this helps!
Brad Nelson
SOURCE: WRONG CARTRIDGE and Printhead does not move MP780
your printer ink cartridge can not access (move to middle) when you open up the cover, you may try
1) try to open right side cover you move the cartridge by hand (power off) to middle position, then take out the cartridge and reinstall it then power on, the cartridge moving right, you may open up the cover again if the cartridge go back the middle position which means your printer works normal. still stop moving go next
2) check the cartridge initcial sensor at righe side, the cartridge moving to the end of right should be touch this sensor, find out it and check there is good touch (click) by the cartridge body. adjust the sensor position maybe needed.
3) cartridge is stucked sometime also check the cartridge moving rail hard moving, need to drop oil to lubricate.
SOURCE: mp780 wrong cartridge error
Try to reset to factory .
Remove ink cartridges and print head.
Power off machine and unplug for 10-15 minutes.
Restart machine and install head and cartridges.
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