If your documents are printing too light, it could be caused by hardware or it could be the settings used to print. In this situation, you can start by printing a nozzle check to see if the ink is working properly. You can perform a nozzle check by using the steps provided HERE. If the nozzle check print is too light to read or if there are any colors missing, you can try cleaning the print head using the steps provided HERE.
If the nozzle check prints correctly, it will usually be caused by a setting issue. To assist further, I would need some additional information.
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If the PGBK is missing, it will usually be the cause of your print issue. THe PGBK tanks is the one used for the majority of your document printing.
To resolve this issue, you can try cleaning the print head using the steps provided in the link HERE. After cleaning the print head, you can print another nozzle check to see if the PGBK is showing up. If you perform two cleanings and the PGBK does not show up. You can try a deep cleaning using the steps provided HERE.
If the PGBK is still not printing, it looks like there is something wrong with the hardware. The printer has a 1 year warranty and you can click the link HERE to create a Canon account to see what service options you have. Outside of the 1 year warranty, you can contact our sales department at 1-800-652-2666 to use our Upgrade Program. The Upgrade program will give you a discount and free shipping on a replacement printer.