Your responses to #1, 2, 3, 4 +5 are concerning... The fact that your printer is 4 yrs old, never been cleaned or had parts replaced, is only used about once a month, cartridges haven’t been agitated, and carts weren’t primed prior to instillation all contribute to a yucky situation…
My feedback after reading your responses, is that you have likely been dealing with the effects of air due to not priming the cartridge exit channels prior to installing (air in the ink system will interrupt ink flow when it reaches the damper and print head), a 4yr old printer that has never been cleaned, never had parts replaced, ink carts never agitated, and printer only used once a month will be very dirty inside from waste ink gunk, and have particle build up in the dampers (which should be replaced every 1-3 years)- resulting in restricted ink flow, clogged/mis-firing nozzles, and other printing problems. Your response of “NYC” to my question asking about temperature and humidity in your printing environment doesn’t tell me anything, as the outside environment is not the same as inside.
I recommend manually cleaning your printer following our instructions, which you can find here: http://www.inkjetmall.com/tech/content.php?133-Printer-Cleaning-and-Preventative-Maintenance
In addition to a thorough cleaning and cartridge agitation, your printer is minimally due for new dampers and wiper blade. Please read our 4800/4880 cartridge instructions (attached), and pay close attention to the information regarding priming cartridges, cartridge agitation, and printer use information to get the best results and most from your system.
I hope this helps, please keep me posted.
4800 + 4880 Fill Instructions (insert# 101)-email.pdf (123 KB)