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I have been working on Mutoh printers for sometime, never seen this happen. O-Rings are made from rubber and the ink lines are made from plastic that is much harder than that rubber so I can't figure how that can happen.

On certain VJ mainboard revisions, dip switch 2 position must be changed (set to "ON" I think) before you can update firmware via the MEA or MSA programs

The VJ-1614 has sub-tanks, ink is gravity fed to the subtanks from the main cartridges and is controlled by 2-way valves. The printhead draws its ink supply from the sub-tanks. This is one of the differences between the Valuejet printers (except the VJ-1204's and VJ-1304's) from the older Mutoh...

Most likely the Heater Relay Board Assy

Looks like the ink is not being sucked through the prithead during the cleaning cycle. Check that there is a good seal between the cap and the printhead, also make sure the waste ink tubes are not blocked.

You always get less prints from the first set of ink cartridges because some of the ink is used to clean then fill up the ink lines and the printhead during the initial ink load cycle.

There is a damper for eack ink channel so there are 2 dampers for each color

Also check that the ribbon cable connecting the control panel to the mainboard is properly inserted both ends, bad insertion of this cable is the most common cause of VJ printers not powering up all the time.

That valve should be sealed when the printhead is in the home position to create the seal between the printhead and the cap unit. The valve opens when the printhead moves a bit to the left during the last stage of the cleaning cycle so the pump can suck any excess ink left on the cap unit.

Use the ones from cap to pump

Was this a DIY job or done by Mutoh authorized service agent?

This is the best way to go, create custom profiles for your media.

Try this, print the same file with no wave, (you may see horizontal banding but ignore that for now), see if vertical banding still present. If not, problem is with the profile you are using.

Problem 1: Most likely air leak on that partular ink line, check damper, O-ring, make sure the bronze nuts are secure, tighten by hand only, do not use any tool as this can cause tge O-ring to deform. Problem 2: Most likely maintenance unit problem, the correct amount of ink is not being...

I would only force wash solution through a head using a syringe as a last resort before replacing it.

If all the nozzles are printing and you are happy with the print quality , you do not have to replace the printhead if you don't want to, just reset head the counter to get trid of the error message.

A new printhead should still print even without entering its head rank but you may not get the best print quality from it. Part of the head rank is the printhead's voltage offset values which controls the size and shape of the main dot and the positioning of its satellite dots.

Possibly blown printhead fuse(s) on mainboard

Menu Setting, Prev Stick, must be set to Off

The 40 40 50 settings are good starting points on a room temperature of 24 degrees with around 50 % humidity. I suspect the problem lies mainly with the profile you are using because as you said, it only occurs on this media and only on certain dark colour combinations. This usually indicate...