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In theory, the reading should be exact, but usually it's not. I wouldn't rely on this part of the software, it's faster to take a quick look at the bags.

Did you measure the meniscus vacuum using the external gauge? Did you replace the small filters inside the carriage, in the vacuum tubing?

White ink pumps are always the most tired due to the ink weight. Look around the pumps, maybe there's a black powder around (if it's there, the brushes are approaching the end of their lifetime. Newer machines have brushless pumps, I'm not sure which version you have. Did you replace the main...

If you see this problem two weeks after the head replacement, maybe you need to consider the ink system flushing to remove sediments from tubes, pumps and so on. And an important question - when did you replace the ink filters for the last time?

Take a quick look inside the carriage and compare the position of the missing nozzles with the ink connection tube at the top of the head. Older versions of Arizona had a similar problem on the white channels - ink flows into the head and leaves some sediment on the internal side of the nozzle...

Be aware that it's not a full Windows XP, it's Windows XP Embedded. Not everything is available in the system and some drivers for XP may not work on the Embedded.

How often the problem on the C channel appears? Always? Once per day? What are the values for the Plus and Minus Pressures? Do you have degassing modules installed? If yes, what is the degassing pressure? Have you ever tried to perform the sending adjust test?

Yes, this is the board. All heads are connected to it. During the removal be careful, as the flat cables between the board and each head are not very resistant (by the way, check if on the head with the problem all wires in this cable are clean and without any signs of the short circuit, I saw a...

Error 707 "!HD Heater brk" means, that the printhead doesn't heat up. In the service menu (#TEST->Check temp) you can check the current temperature in each head (normal temperature should be about 43 Celsius degrees). If the printer is powered up for more than one hour and the temperature in one...

Movement of the XT printer requires two trained service technicians/engineers (except if you want to move it 5 metres left or right in the same room). It is a serious task, including de-installation and installation in the new location. Once I did it with my colleague and it took us 30 working...

Check the same fittings for older models, I suppose it's the same one.

White ink is the heaviest ink of all colours. Maybe you have a meniscus vacuum too weak and it can't keep the ink inside the heads.

If the problem is visible only in the W channel, it means it's somewhere in this channel. When the nozzles are gone, is there any ink on the nozzle plates of the head? Do you see any ink in the vacuum tubing above the heads? Is any ink spilt under heads after the long idle time?

To calibrate the meniscus vacuum set point you need a service key and a vacuum gauge connected to the vacuum tube. The gauge shows how the meniscus vacuum value changes (in fact is not a single value, it is increasing and decreasing around the specific set point in a specific time. Both set...

Check also if the percentage of solid colour matters - i.e. try 100% and 70% of the same pure colour (use only pure CMYK solids, nothing else).

Have you ever done the vacuum operational setpoint adjustment using an external vacuum gauge (the value on the screen may not be exact)? The meniscus vacuum should balance around the specific setpoint in specific time and that needs to be checked from time to time.

Have you tried to print unidirectionally? Is the banding visible in a specific colour only?

Have you checked the meniscus vacuum level? Any leaks from the ink system (especially white)?

Alternative inks are always risky. Sometimes it's possible to receive some warranty from the ink supplier, but there's no rule. And usually, swapping from the original inks to alternatives during the warranty period is a reason to stop the warranty (at least for the ink system).

I've heard that it's possible to buy a key which works only with one specific machine (one s/n) - but they were available only for owners.