If you experience missing nozzles on your printer, we recommend you check and perform the following.

Missing nozzles can be caused by any of the following:

  • Air in the lines
  • Faulty diaphragm pump
  • Maintenance intervals have not been respected
  • Expired ink
  • Printer has been left powered off
  • Failed print head

Air in the Lines:

If you notice some air in the ink tubes or above the print head, we recommend you perform the following:

  • Perform a couple of Little Charges from VSM
  • Check that the air bubbles are flowing towards the head during the little charge
  • In order to completely clear the air from the lines, you may need to perform an initial charge from VSM.

Faulty diaphragm pump:

The diaphragm pump is the small pump that sits in front of the capping station. Its purpose is to suck the ink out from the capping station during cleans. A sign that the pump is faulty is that ink will remain in the cap head during cleans and cause it to spill in the surrounding areas as well as cause missing nozzles. A way to confirm whether the pump is at fault is to perform a small clean and check whether it is emitting a noise during the cleaning process. If it is not sucking ink nor making a noise, then the pump is faulty and will need replacing. In which case, please contact technical support for assistance with this.

Maintenance intervals not respected

In order to ensure the longevity of the print head and to avoid it from getting blocked it is important to respect the preventative maintenance and the intervals at which the consumable parts must be replaced as well as keep the printer powered on. Omitting to perform the necessary maintenance can shorten the life of the printer as well as the print head.
If you experience nozzle loss because the maintenance intervals have not been respected, we recommend replacing and cleaning any parts required followed by performing the following cleans:

  • If only a few missing nozzles in one or two ink channels, try a couple of normal cleans.
  • If no improvement, try a long clean.
  • If either no improvement or extensive nozzle loss, try an overnight soak with Clean60.  You may need to do this 2-3 times to bring all the nozzles back. See the 1min40 mark of the Preventative Maintenance video
  • Take Sawgrass Clean60 and hot distilled water at a ratio of 2:1 (Looking to achieve steam not boiling)
  • Temporarily turned off the auto clean in VSM (To allow the print head to sit in the solution without being drained out. Don’t forget to turn it back on again after recovery).

Expired ink:

  • Remove any expired Inks from the printer and from replacement ink stock.
  • It is suggested that if any expired ink is in the printer lines at this point, change the capping station assembly, then a longstore should be performed on the printer to flush it out entirely and then recharge with fresh ink.
  • Using expired ink may cause damage to the print head, clog the capping station, pump lines, create nozzle loss and may result in a shift of the colour output.

Printer has been left powered off

In order to keep the printer at its best, it is important, in addition to the preventative maintenance, to keep the printer powered on at all times. Similar to the other Sawgrass printers, the VJ628 performs a clean at set intervals as well as during printing. The type of cleans and interval is set in the VSM settings. If the printer has been left powered off and has blocked nozzles, we recommend performing the following:

  • If only a few missing nozzles in one or two ink channels, try a couple of normal cleans.
  • If no improvement, try a long clean.
  • If either no improvement or extensive nozzle loss, try an overnight print head soak with Clean60.  You may need to do this 2-3 times to bring all the nozzles back. See the 1min40 mark of the Preventative Maintenance video
  • Take Sawgrass Clean60 and hot water at a ratio of 2:1 (Looking to achieve steam not boiling)
  • Temporarily turned off the auto clean in VSM (To allow the print head to sit in the solution without being drained out. Don’t forget to turn it back on again after recovery).