Why is my Canon PIXMA MG6220 skipping lines when it is printing?

Assuming that you aren't running out of ink, it probably needs either a good print head cleaning (beyond that the software does) or a print head replacement, if you model had replaceable print heads. My experience with Canon printers has been mixed, but some of them have replaceable print heads and some don't. Make sure you're not running out if ink before you proceed with the following.

You could try this first:

1. Get some distilled water.
2. Remove the print head and remove the ink tanks.
3. Get a shallow cup or dish and put the print head in it.
4.Add distilled water to just barely immerse the print head only.
5. Add several drops of the distilled water to the "inside" part of the print head in each color section.
6. Leave for several hours or overnight.
7. Remove the print head and discard the water, clean your cup or dish. If the print head is fixed and not removable, go to step 14.
8. CAREFULLY blot, do not rub, the bottom of the print head.
9. Run the "deep clean" print head cleaning cycle once.
10. Run the test print or nozzle check to see if it is now printing without white bars (skipping parts of the lines.
11. If this works, then do your print head alignment.
12. If this doesn't work, you might look into buying a special print head cleaning kit that has a syringe, a tube (or tubing), and an adapter or two in order to allow you to inject the special cleaning solution into and through the print head, doing whatever the directions tell you to do.
13. If that doesn't work, then see if you can buy a replacement print head.
14.If you weren't able to remove the print head for cleaning, then it may be time to consider it not worth the trouble and replacing it with another printer. I like the Brother brand of inkjet printers since they use much less ink during the cleaning cycle and some of the models have optional high-capacity ink tanks.

To avoid this happening in the future, make sure you use your printer at least every few days. Print something that has every color in it so that it keeps each part of the print head from drying out. Keep in mind that every time your printer runs a cleaning cycle, you use up quite a bit of ink for most brands of printers, so if you replace your printer, consider a Brother printer. It's not that Canon makes all bad inkjet printers. They've had some that were apparently problematic in the past (like the BJC-6000, which I went through 3 of those before the warranty expired), but they use a lot of ink when they run their print head cleaning cycle whenever the firmware determines that it needs to run the cycle.

If you are successful in getting the printer to print lines without missing bands of color, then keep the printer by all means. Consider getting some generic replacement ink tanks so that you can afford to run the printer every few days. Many printers are sold at a very low price because the company expects to make more money on replacement ink tanks. The lowest priced ones seem to use more ink, too.

Also, if you don't need color printing, consider a black and white laser printer. Before buying, check the price of the consumables -- toner at the very least, and if there are any replaceable parts other than the toner cartridge, find out how long those are supposed to last before replacement and how much they cost. Your first toner cartridge might be a "starter cartridge" which may not even be half full of toner, so buy a spare toner cartridge when you buy the laser printer. Some brands have a rather high cost per page because the replacement toner cartridges cost a lot.

Donald