Magenta Banding Pro 10s

[The Hat]

Have you tried shaking the ink bottle before refill, and doing the same with the cart before putting it into the printer..

I spent 43 years in the Litho printing industry, so I am used to dealing with ink etc.

inkjet printing is so much different to Litho, especially when it comes to pigment ink..
47 years as you, retired too..

 

[Artur5]

If a brand new OEM cart gives the same results, then the problem isn't faulty ink or a damaged cart. It must be the printhead.

Partially clogged nozzles could result in ink starvation. Maybe a progressive build up of crud inside the ink channels, like a sort of printer's arteriosclerosis. Besides, magenta is usually the most troublesome color of Pro10 third party inks. Myself and other people here had trouble with this color in the past.
Suggestions ?. Keep using OEM magenta ink and probably the issue will disappear progressively after a while.

 

[thebestcpu]

Your problem is above my pay grade to help much more, and I will leave it to those with more expertise.
It did seem odd that the banding appeared to extend beyond the large magenta patch.
One thing I did not hear mentioned is checking for a good connection without contamination (crosstalk possibility) at the electrical contacts for the printhead itself, which is typically a pressure connection and more prone to problems (as shown in the arrow of the image).
John Wheeler

 

[Paul Edmunds]

Your problem is above my pay grade to help much more, and I will leave it to those with more expertise.
It did seem odd that the banding appeared to extend beyond the large magenta patch.
One thing I did not hear mentioned is checking for a good connection without contamination (crosstalk possibility) at the electrical contacts for the printhead itself, which is typically a pressure connection and more prone to problems (as shown in the arrow of the image).
John Wheeler

View attachment 17265

Thank you all for your help. I'll clean the contacts and try more OEM ink and report back when it's evening sorted.

Thanks again.

Paul

 

[thebestcpu]

Thank you all for your help. I'll clean the contacts and try more OEM ink and report back when it's evening sorted.

Thanks again.

Paul

A couple of items,
- Under unusual situations, ink or other contaminants between the round gold contact points can cause problems.
- Also, if the pads are no longer gold (gold coating), a good solid electrical connection becomes much less certain, as when the gold is gone, the underlying metal can and will oxidize and create poor conductivity. Gold is used because it does not oxidize.

I experienced this issue with one of my printheads' connection points, where many still had a gold coating, while others did not (I suspect the ones without gold may have been the ones that carried the most current).

I'm not sure if this is your problem yet, but it's worth ruling out.
It is more likely to happen if the printhead was a salvaged or remanufactured unit, so not just pre-owned yet pre-worn out.

John Wheeler

 

[Artur5]

I don't think it's a problem with the contacts. For one thing, it's very strange that only magenta has issues. There’re about 80 contacts on the printhead and one row of nozzles per each color. I don’t know how many nozzles has each of them, but the Pro9000 has 768 nozzles per color. On the Pro10 it must be the same or more. That makes a minimum of 7680 nozzles controlled by 80 contacts. It makes sense that the failure of just one contact would affect the output of dozens of nozzles on different colors.

Besides ( and more significant ), nozzle tests don't show the issue. We see it only printing large areas of solid color. All this points to ink starvation for one reason or another. Considering that a new OEM cart didn't fix the problem at once, my money is on partial and progressive clog of the internal ink channels, possibly because of suboptimal third party ink and maybe other factors like not printing often enough. ( I'm just speculating here, the OP. didn't say if the printer hadn't been used for some time ).

 

[Paul Edmunds]

I don't think it's a problem with the contacts. For one thing, it's very strange that only magenta has issues. There’re about 80 contacts on the printhead and one row of nozzles per each color. I don’t know how many nozzles has each of them, but the Pro9000 has 768 nozzles per color. On the Pro10 it must be the same or more. That makes a minimum of 7680 nozzles controlled by 80 contacts. It makes sense that the failure of just one contact would affect the output of dozens of nozzles on different colors.

Besides ( and more significant ), nozzle tests don't show the issue. We see it only printing large areas of solid color. All this points to ink starvation for one reason or another. Considering that a new OEM cart didn't fix the problem at once, my money is on partial and progressive clog of the internal ink channels, possibly because of suboptimal third party ink and maybe other factors like not printing often enough. ( I'm just speculating here, the OP. didn't say if the printer hadn't been used for some time ).

Hello Artur5:
The printer is in weekly use.

Paul

 

[Artur5]

I’ve had my Pro 10 for seven years. After Canon’s original cartridges that came with the printer were empty I started to refill them with third party ink. As I said, magenta had been the most troublesome color. To a lesser extent, there were issues with red and photomagenta too.

I read somewhere that the problem resides mainly in the different pigments used by Canon vs. third party manufacturers. Apparently Canon has access to custom made magenta and red pigments, very strong in color, thus needing less amount of pigment in the ink to produce the correct density. Third party inks have to use products available in the market, weaker in density, so they have to increase considerably the amount the pigment to make the correct color. That high percentage of pigment makes the ink much more prone to sedimentation and eventual internal clogs. I don’t know if this is the explanation, but it makes sense, given my experience with the issue.

It’s been years since I reverted to OEM for those three inks and banding never reappeared.