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Based on one of your pics on your double photo thread, your pinch rollers are in serious need of cleaning. Use a foam swab and alcohol. And clean all the debris from around the roller shaft. As everything moves faster when cutting and the back and forth movement of the media, dirty pinch rollers...

Before you put the new mainboard in, go into Service Mode and get the head rank for all 4 heads to enter into the new mainboard. Also go into the head adjust section and write down the horizontal and bi-direction settings. In addition, go into the crop-cut and print-cut alignment sections and...

Please post a job print showing the banding...

If there is no change in the number of missing nozzles after doing 2-3 head soaks, then I'm sorry to say, I believe the black channel is permanently clogged.

Please post your latest nozzle check.

You're making progress! Suggest posting a nozzle test at this time to see what you have. It looks like it's starving out as it prints. Try doing overnight head soaks and see if it brings it back. When you do nozzle test prints, mark them and keep them. After each cleaning cycle and nozzle test...

Pull ink through the damper with a syringe. If you can't pull ink or get a lot of resistance, then remove the cartridge and try to pull again. If you are still getting resistance, remove the damper and connect the syringe to the ink line directly and see what happens. This is just in case the...

As damonCA21 suggested, now swap the black and cyan dampers on the print head, do a normal clean and run the fill test again. The normal color laydown for this test is "KCMY". If the problem is a supply issue, meaning a bad/clogged damper, which I understand is new, then your printed pattern...

Go into service mode. In the service menu, go to Test Pattern, then to Fill Test. This prints each color channel independently at 720 - 8 pass - bidirectional - std speed. This completely eliminates the computer and software. Quickest and most reliable way to check the condition of each color...

What damonCA21 said... Also, as your black cartridge is going on 6 years old, you may want to verify it has ink in it. Pull it out of the printer with the printer turned off so you don't reset the ink counter display. What can happen is the physical tab on the cartridge can occasionally get...

Pretty much any hardware or auto parts store. Get the grease, not the spray.

No on the video, but it's straight forward - clean the 4 chrome strips with swabs and alcohol until clean. See pic. Move the head carriage back and forth the width of the machine, it should move freely. If so, as mentioned above, very lightly grease the chrome strips with white lithium grease...

Clean the guide rails...

There are 4 head carriage bearing guides - shiny chrome strips. You can see 2 of them from the front on the Y guide rail. The other 2 are directly behind them on the Y guide rail. Clean these with a swab and alcohol until totally clean. Excessive resistance from ink and dust buildup on these...

It would be easier for most of us to be able to help if you could post the screen shots of your settings with the system in English.

You should run a nozzle test print and the fill test, both in service mode and post the results.

You are very welcome. And you made the right choice on which chemical to use on which part. Just insure when you re-installed the encoder sensor, the encoder strip is centered in the slot and not touching either side of the opening of the sensor.

Clean your encoder strip with a microfiber cloth and acetone.

"I need to stop mucking around with this inkjet nonsense, and get me a Giccle Squirter." Your Canon 8400 is a Giclee Squirter...

First, I admire your willingness to venture into a whole different area of the printing world. Agree 100% with Humble PM. Spent a few years doing Giclee printing, starting with the Iris 3047, then on to early aqueous Roland FJ's with hexachrome pigment inks, then on to Canon and Epson printers...