07-17-2017 09:03 AM
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08-14-2017 08:16 PM
My MG7120 has the same problem, I was sure it was the printhead so I ordered a new one, but to my great disappointment the problem didn't go away, I used all new ink tanks as well. Might be time for a new brand, and I've used Canons for something like 10 years now, ever since I got my first printer.
09-04-2017 07:27 AM
I brought up the exact same issue recently on this forum, see http://community.usa.canon.com/t5/Printer-Multifunction-Support/Canon-MG5650-Page-Black-Text-Double-...
This issue only affects when using Page Black ink and when the printer is forced to photo mode and so uses Photo Black ink, the text is sharp - so it's not the encoder strip being 'dirty' otherwise all printing would be affected be text, graphics or photos.
I am wondering it's because I am using non-oem ink cartridges, there is a random counter being triggered by their use, and when this runs down it triggers the print engine software in the printer to mess up the printing deliberately - a bit like the recent Volkswagen issue where the engine management software determines that the car is undergoing an emissions test and so changes the engine characteristic to pass that test! Canon wants you to buy another printer.
Think about it, it affects many types of printer, using a different number of cartridges, so the print heads are different and so therefore the drive electronics all showing the same issue on paper. As other people have said replacing the print head does not make the issue go away.
09-04-2017 04:28 PM
09-08-2017 02:33 PM
I'll join this club with my MG5450.
My case started with occasional B200 errors that interrupted print jobs. Tried every trick I could find - including thorough cleaning of the print head. No help. So I concluded the print head must be faulty. It probably gets too hot after some printing and then B200 occurs.
Then I ordered a new print head from China -> black PGBK distortion from the beginning. Color printing works fine. Tried cleanings & alignments. No help. Then I temporarily put the old print head back: no distortion. So I concluded my new print head must be faulty. Now this thread gives me hope/second thoughts.
I have contacted local Canon support twice. They just gave the usual cleaning instructions and proposed contacting the (very expensive) service.
I'll soon buy new - most probably a non-Canon - printer, unless the root cause is soon found. Color printing everything is so s.l.o.w.