The most common is nozzle blockage, which can be divided into two cases.
One is completely blocked, that is, when the machine starts up normally, there is no ink line coming down from the nozzle, the pressure and speed of the machine are normal, but there is no ink line coming down. This is completely blocked.
Another is that the ink line deviates and does not spray to the correct position of the recycling tank. That is, when printing normally, the ink line suddenly deviates. If the nozzle has not fallen, the nozzle is generally blocked:

If the nozzle is still blocked, then we need to remove the nozzle, because Citronix 3200/3300 does not have nozzle cleaning function, so we can only remove the nozzle, and then put the nozzle into the ultrasonic, ultrasonic wave put some cleaning fluid, and then use ultrasonic vibration cleaning, cleaning for hundreds of seconds, cleaning several times in a row, and then test whether the nozzle is clear.
Then if we remove the nozzle, be careful to remove the two screws on the side:


Because the screws here were removed:








