I don't run a JV150, but here are some general things to look at and check.
-When was the last time the head caps where changed?
- I had a similar issue on my JFX200 that turned out to be a subtank replacement, has this been replaced recently if at all?
- Is the printhead free and clear of any dust / built up ink?
- Is there a pos./neg. pressure adjust for the nozzles at all? The weather is changing which means changing environmental conditions. Being in WI and having 30 deg in the morning and 60 deg when I walk out the door I have had to do this a few times.
-What age is your printhead?
My problem ended up being an ink starvation issue, basically had the trace the ink line from the bottle through the pumps into the head to make sure there was no ink line rupture. Also changed everything in between here and there including ink pump, solonoid, and sub tank. Was just about $100 to change all that but haven't had a problem since. This was the best case scenario and the worst case scenario is the printhead was going, which may be happening and usually in my experience, if you have changed all the above and it is still happening it is the printhead needing to be replaced.
