The first step would be to replace the ink cartridges.
Next, perform a few printhead cleanings. To perform cleaning, please follow the steps in this Knowledgebase Article:
If you are experiencing blurry printing or printing that look italicized, cleaning the timing strip/encoder would be done. To clean the encoder/timing strip, please follow the steps in this article:
Thank you for the reply, Patrick. Much appreciated. So, this could be caused by being out of printer ink. Yes? The printer has been low on color ink for some time. I've not replaced the cartridge because color isn't important to my print jobs. Could it be that simply getting a color cartridge would clear this issue?
What version of Windows is installed on your computer? If using a Mac, what version of OS X is installed?
Are you using your PIXMA MG3120 with a USB cable or wirelessly?
What application are you using to perform a scan?
Thanks for your followup, Patrick. Here are the answers:
Need any additional info?
12/05/2023: New firmware updates are available.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.