I have a pixma MG3620 that was working perfectly fine this morning but it suddenly started printing only every other line. I have recently refilled the ink cart manually (to save money) and it was working fine until today (time of this post). I noticed that it is mainly happening with monochromatic prints. I have cleaned the print head of the ink cartriages but am still yielding the same result. Please help. I have attached the various prints that i have printed that have this issue.
I would suggest you perform all of the maintenance checks,, Nozzle check, Alignment, Check the encoder timing strip is not dirty, etc, In the end it might be the 3rd party ink, but you didn't say how long you had been using it, or if it worked correctly prior to this.
Tooubleshoot Print Quality Issues: