WHY CLEAN?

Below is a nozzle test print that we are probably only two aware off, if this is the case after trying to recover the head(s) then the only thing to do is to replace the head.

After a while a print head may become blocked by paper debris or solidified/dried ink. And you notice your printing quality is suffering or the printer fails to print at all, and the above has not help it may be time to change your print head. On some printers it is very easy to change a print head on others it is not so easy. There are quite a few items to be removed to gain access to the print heads, precautions have to be taken against static and you should not remove any heads unless the mains lead is removed after power down simply switching of from the control panel is not enough. Unless you are familiar with these it is best left to engineers who know what they are doing.

There are always mechanical, electronic and electrical adjustments to carry out when fitting a head.

Mechanical – This is always obvious and when taking a print head out the least amount of disturbance on removal makes it easy to adjust when using the appropriate test file.

Electronic – This adjustment is used to line all the heads together given the mechanical adjustment is correct. It moves the firing up or down usually using the black as reference.

Electrically – This is the voltage that is applied to the head to force out the droplets on grand format printers it is normally as a voltage reference which is adjusted by a potentiometer on a head board, however on large format it is by entering a head rank number which not only sets the voltage but various other items such as drop size, firing rate etc. It is on these units it becomes difficult to determine which numbers actually change the voltage, because the crystal characteristics change by increasing the voltage you can sometimes improve the quality but changing the numbers randomly can cause problems like nozzle drop out and deflection. These heads are manufactured with the head rank for optimum quality for a given printer and should therefore be replaced when quality starts to fall away normally with blocked nozzles that cannot be cleaned, leading to deflection or no output.

The characteristics of solvent based ink for outdoor printer are easy to be evaporated and fast dry, which clogs the print head very easily. In some condition that the print head clogs more frequently if the ink was mixed some micro impurity.

The characteristics of solvent based ink for outdoor printer are easy to be evaporated and fast dry, which clogs the print head very easily. In some condition that the print head clogs more frequently if the ink was mixed some micro impurity. Currently there are 3 ways to clean the print head:

1. Using vacuum cleaner to suck out the built up from outside of the jets.

2. Using syringe with cleaning liquid push out from the inlet of the jet.

3. Buy ultra-sonic vibrator.