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This is a contone printer. Even if sending 100% Black it will be printed using C and M. I would go for 100/60/60/0 KCMY, because until 60% it uses Lc and Lm, which will use way more ink. Or you create a media preset with CMYK only to prevent from using light inks Have you done linearization and...

Just the amber led means printer is off on frontpanel. Does leds change when pushing the the fp button? The button should alight, and what happens on the rear led‘s? And maybe you can check the 3 led near network connector.

To change meniscus vacuum you need access to service mode. The restrictor valves close to the pump and the relief valve are meant to regulate the speed of applying/releasing the negative pressure.

What happens if you switch the unit at the main switch? Please provide the status of the three LED’s near the main switch

This is nearly impossible. Sleep mode is meaning that the panel button is blinking. Is there initialization of any device working? Is the carriage moving?

I would go for the main ink filter. To me it looks like the unit can’t fill the reservoir in time.

But Cutting and other devices are not available in the HP SAI license…

Easy task. Upgrade your SAI to Full Version and you can can easily control both units from SAI.

Since you’ve already did everything, and the sax calibration is not really necessary, I would go for the trailing data cable. The cable can cause several problems, but I never had the issue you described. I would not go for the sax motor, because this would trigger a rod lubrcation message.

seems that you have rotated the sheet on the output table. I guess the banding is horizontal, not vertical. Check the nozzle test print If the printheads are in good condition. If not, replace the defective printheads. If yes, check diagnostic drop detection / reset database and redo the same...

The original OMAS contains the sensor with platen and the cable with all ferrite necessary. Routing the cable is a lot of work. Good luck

Does it happen with a newly created substrate also?

Just unsrew the platen that holds the OMAS, unclip the brown clip holding the cable. Then connect the the new OMAS which comes with the platen preassembled and fit it into the print platen. Do not try to calibrate the OMAS, it won’t work and it is not necessary.

OMAS glas should look shiny blue, not greyed. I would replace it cause everything points to this tracking sensor. The drive roller encoder is not easy to access fully, because you need to remove iss and cartridge holder.

Check out if your inks are expired. This will make pigments settling to bottom of your cartridge making the ink color completely random.

If ink drips through printhead while filling it could be a clogged meniscus filter.

Not the heaters, but the chamber inside and the perforated plate.

Check and clean contact of interconnect pca. Replace the printhead. Swap interconnect pca with a different color and verify if problem is moving with the pca.

I guess you have Problem with your Meniskusfilter in the carriage. Check and replace if necessary. Check also the 3-way-valve in the ink bay, which controls the recirculation. Could be that ink is filled instead of recircled. The adjuster valves are meant to control air flow when pressurizing...

Check and reduce input tension. Is there a lot of debris on the drive roller making the substrate slipping?