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Please post a test print showing how the heads are firing. The only explanation I can think of is you are missing a section of the black channel.

You must pull ink through the head very slowly and gently.

What ink configuration are you running? If you are running CMYKx2 did you change both magenta dampers?

Cleaning can pull enough ink from a mostly empty cartridge to temporarily recharge the print head as there is always a bit left in the cartridge. Normal ink supply to the head is by gravity feed to the dampers. Did you check the magenta cartridge?

Power down the printer, both sub power and main power. Pull the magenta ink cartridge and make sure it has ink by rocking it back and forth. I have run into multiple instances recently where the tab on the cartridge did not come out and trip the switch to stop the printer.

These are the steps that need to be taken next: 1. "Intialize the limit". After doing this step, go into service mode and do a test print. Ignore the test print results, but instead check the cap to head alignment. Do this so you can see where the machine parks the head through the normal...

OK, you are not pulling ink through the M/Y head yet. If you were, you would see the color change I described. Also, the M/Y cap looks dry, while the K/C cap is wet. So this is the first thing you must fix. Any other steps are a waste of time until you know you have ink going through the head...

Please post a pic of the caps after you did the above. When you do this damper swap, you must do at the very least a medium cleaning to flush the previous ink colors out of the head. You will see a change in the color of the inside of the caps, where the K/C left cap is looking M/Y and the M/Y...

What town?

Do you have a lot of jobs in your queue? I have found the more jobs in the queue, the slower Onyx responds. If you need to keep the jobs for future printing, you can move them from the printer folder in the Thrive19/Work/"printer name" to a different folder for backup. Do this with Thrive...

You are not pulling ink through the M/Y head. That is the first issue that must be solved. There are several adjustment to be made to insure the capping is correct. Do you have a service manual? Those are the fuses. Measure them with a resistance meter on it's most sensitive scale. They should...

Make sure the fuses you checked are those in the attached pic (look for the red outline in the pic), as these are the fuses that supply voltage to the printheads and there are only 2. If these are good, have you tried to gently pull ink through each cap individually? Depending upon that test...

Start by initializing the limit - hold left, right, up arrow keys and power on, follow the prompts. Then, as stated above, run the encoder setup and calibration in service mode. Let us know...

See attached for details. It looks like you may need a good Roland tech to come in.

What is the tested outdoor durability of this ink compared to the current solvent & ecosolvent inks?

Also close off the line for the cap for the missing head, or the cleaning cycle will just pull air.

Not familiar with the Polar printer. More info needed for that, like a model number. Try Google searching and possibly Alibaba for info. Alibaba will probably be best as it's Chinese...

That is a good troubleshooting technique to narrow down the issue. But, after switching the dampers, did you do a cleaning, preferably a medium cleaning to flush the other color inks from the head? If the test print done after this is K/C, but physically where the M/Y normally is, then you have...

That would make sense, but the title had it correct. My point being there is a lot of info thrown around by various posters who don't do their research and make sure what they are posting is accurate. I have seen answers that would actually cause more issues. As people who ask for help are...

Apparently you are not familiar with the Roland printer line. That model was a very popular printer and a workhorse machine. Please check your information before posting to insure you are not accidentally misleading someone. As far a good price, I would do a web search for that model being for...