Ok, my experience, usually when we think a missing channel is the head, it’s not, it’s a clogged damper, especially with piezography using fibrous matte papers like me. With these units you need to replace all the dampers at once. This unit is called the “ink selector unit “ you can buy one at Compas micro for about $360.00 I believe is the amount. There is something you need to calibrate when doing this. I don’t work on my own machines, but with a maintenance manual it’s doable if you like to do this kind of thing. Yea it was a local certified tech that did mine.
If you are not seeing warped edges in your nozzle check, evidence of a delaminated head, the problem is almost always the dampers in the ink selector unit. I had both problems. Walker at inkjet mall was telling people to change this selector unit every year if doing a lot of production work. I don’t do nearly that much to consider that.
I have always kept my cap assembly damp by cleaning every week with distilled water and my tech said it looked like new. But if the cap has dried out and doesn’t fit the nozzles tightly tyat can cause air in the lines and poor cleaning and then you need a new pump/cap assembly. These pumps last for many thousands of prints but the capping station is certainly something to look at.
John
Interesting, did you have someone local repair it ? Has the repair been reliable ? I'm running Pieozgraphy Pro on a smaller printer and wanted to convert my 9890. Mine went through 4 print heads in 3 years (covered under extended warranty), but I don't even know if the head was the actual problem - it was always the CYAN channel that was dying. What else should I replace besides the head ?
Paul
