My 7900 (running a K5 Cool/K4 Warm Piezo Pro setup) has developed a troubling nozzle drop-out pattern. I’ve been printing on this 7900 (and also a P9000) for quite a while and I’m pretty familiar with EPSON nozzle failure symptoms and causes but this one has me stumped.
First, all the symptoms are on carts/channels in the LEFT ink bay. Here’s a typical scenario:
- Fire up printer to start a printing session
- Run nozzle check - missing one or two adjacent nozzles on bottom row of Orange channel, and one nozzle on bottom row of Yellow channel. Everything else is good except for delaminated Green and K channels which I’ve mapped out.
- Reboot printer into Service Mode, run CL1 pair clean on Y/LLK nozzle pair, run CL1 pair clean on OR/GR nozzle pair.
- Run nozzle check - Orange channel has completely dropped out
At this point, it takes several more cleanings and perhaps a CL2 or CL3 to get the Orange channel back. I have also seen a few cases where the Orange channel is completely gone after doing a print; i.e. all nozzles were good when the print was started, but a nozzle check after the print shows Orange completely missing.
It’s not clear to me what is causing this. Could it be:
a. Bad LEFT ink bay? I mention this since it seems it is always the adjacent Orange that drops out when I clean the Yellow.
b. Ink starvation?
c. Damper issue? The Ink Selector was last replaced in July 2014. I realize the Ink Selector should be replaced about every 2-3 years, but I haven’t been using this printer heavily.
d. Cleaning station issue? Pump/cap assembly was replacedin January 2017 when I converted printer to PiezoPro ink
Because of two delaminated channels already (Green and K) I’m evaluating whether it will be cost-effective to fix this dropout issue.
Any ideas what is most-likely causing this dropout behavior?