Fix Error Code 6502 on Canon printers

 This error is about light and chip-set code. Try to close the cover and check the chip-set, you will loose the error.

1. Unplug the power cord.
2. Remove all ink cartridges.
3. Plug cord back in and turn the printer on.
4. Replace all ink cartridges.
5. close the scanner door (lid)
6. make sure room light doesn't effect the printer light sensor 
7. main point you have to check, check the chip code. for example for canon 650/651 cartridges, Big Black use 650 chip, small black use 651, Yellow 651Y , Cyan 651C, Magenta 651M and Gray 651G