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In theory (when the printer works properly) during the initialization printer should raise the carriage to the maximum, level it (on the basis of both encoders readings) and then lower toe carriage to the home position. If your printer makes an error during the initialization, that may suggest...

Check the ink pouch inlet, I saw situations, when the old inlet was sucking the air around the ink connector. Check also the recirculation valve, maybe it is not closing completely. Of course, check all the fast connectors along with the white ink tubing (between ink port and ink manifold).

Is it always the same colour channels or different channels?

What do you mean 'die'? Blocked nozzles? Damaged electronically? Do you use original inks?

And the same problem happened in two separate channels? There are two pumps, two recirculation valves, two reservoirs and two ink level sensors. If both channels are empty (according to the firmware), I would say that reading is wrong, otherwise, two separate parts would have to be broken...

And the same problem is in two separate channels? At the same time? I don't believe that.

PBA is an abbreviation for the Printed Circuit Board Assembled, Oce/Canon uses this in their manuals. So PBA is an electronic board. You could try another test - connect the ink pouch with another colour to one of the W channels. The firmware should recognize the colour and give you the warning...

Yes. They have different parameters.

It may be the faulty RFID PBA, lack of power there, any of the cables connecting the RFID PBA with the ink control PBA or the ink control PBA itself (located in the ink box, under the table vacuum valves, it has three yellow air tubes - meniscus, purge, degas - connected to the pressure...

Try to search for the 'digital label press' or 'digital label printer'. It won't be cheap, but for example, Mark Andy has such machines, also Fujifilm, Sakata INX, Xeikon, Bobst.

QE256/30 is the correct head if you replace W or CL head (they shot 30 pl drops). All other heads shot 10 pl drops, so you need QE256/10. And don't forget, that when you just lose the head screws, you may need head calibrations to return to the proper printing quality.

Each printhead has specified voltage and change of the ink type won't change it, but... Except for the base voltage (which is different for each printhead and is specified on the package/label, i.e. 24.31 V) each printhead has a correction voltage, which changes the position of the drops shot by...

Nope, I'm based in Europe, so I guess it would be cheaper to search for a technician in the US :) . Try to call Fujifilm, their Acuity flatbeds are exactly the same printers as Arizonas, so they should know how to deal with your printer. The only problem with them may be the SDS key (service...

Seems that your printer requires complete installation including levelling and carriage angle adjustment. It's very important to keep the carriage levelled during the manual raising/lowering, otherwise, it becomes tilted, firmware detects a difference between values read from both motor encoders...

If you use substrates, which requires higher power of the antistatic bar, it may be required to lower the position of the bar. Original Oce bar (round) is also weak, Fujifilm was using a stronger antistatic bar, supplied by Frasier. It has a longer working distance than the round one from Oce.

460 has one DOUBLE head per colour, Miro - two CA4 heads glued together, channels C and M also can be doubled (so two double heads per colour). 460 may have also double white instead of white and varnish. Head replacement and calibrations are not difficult (but you should know, how to do it and...

If the problem is visible only on the acrylic, I would suspect the static. The user manual will not tell you anything about the calibrations, you would have to look at the service manual. Calibration tests are available in the special print area, but you can't evaluate them, as you would require...

Is this problem visible in each print mode? Do you know, when the calibrations were made for the last time?

I think he could find the key since 2019...

What kind of substrate you were using for test prints? Sample prints stored in the firmware looks properly on the specific Canon paper (or a few very similar papers), not on every substrate. And another question - has anyone checked heads calibration?