I bought a used 4900 and used PiezoFlush to purge and clean/store. After a couple years I nozzle checked and needed to do a couple cleanings but got good pattern with PF after doing initial fill again. I installed IJM refillable carts with Cone inks.
Frustratingly I have not the best pattern on home side and, at first, no pattern shows at all on the Full (L) side despite multiple ini charges on L and a couple on R (or together) with utility program, and several cleanings. All Inks on the Full side came back after cleanings and initial charge (oddly, i got the best check after accidentally selecting eject inks) but soon the orange dropped out and now i can only get 10% ink pattern on test. All the inks on the Home side now show 90-95 good check on each color but clogs will not improve.
Any thoughts? Tapped air? Change dampers?
Air (orange) plugs are removed and tanks were all primed. The ink lines across the front of the machine all look full of ink except the bottom (I assume air). The LCD reads the Left side carts as somewhat down from initial reading indicating it recognizes ink supply change.
Also, I did a Dana-Video inspired cleaning of wiper, docking station and Ink waste area along with shoe polish cleaning technique and overnight damp bounty towel. Humidity is good.