Banding (lines) Across Prints
Banding is often caused by either incorrect paper feed or a blocked nozzle.
- Try performing a paper feed adjustment.
- Check below on what to do if you think you may have a blocked nozzle.
The following symptoms may be a sign that you have a blocked nozzle:
- Banding (lines) in proofs.
- Head cleaning failed errors.
- Proofs that look ‘weak’ in colour.
- Proofs that look like they are lacking in a colour.
- High dE readings during verification or calibration.
- Clogged nozzle detected error on printer panel.
The first thing to do if you have any of the above symptoms is to print a nozzle check pattern (please see the relevant article).
Once printed, look to see if you have any broken or missing lines. This is a sign that your nozzle is blocked.
Next, run a normal clean on the relevant colour(s). If multiple colours are affected, run a clean on all colours. If only one colour is affected, run a clean on the relevant colour pair. The cleaning menu is accessible via your printer panel.
After the first clean, print another nozzle check pattern to see if the blockage has disappeared (or worsened).
Repeat the process of cleans followed by nozzle patterns up to four times.
If the blockage is still not clearing, increase the cleaning level to powerful. Repeat this up to three times.
If the blockage still persists, please contact GMG support. A service is most likely required.
Smudging on Proofs
If your printer is showing signs of smudging or marks on proofs, it’s often a sign that a service is due.
Smudging and ink marks occur for several reasons:
- The platen gap is too low, causing the head to strike the paper. Please make sure the platen gap on the printer is at the correct level for your media. You can adjust the platen gap under Menu > Printer Setup > Platen Gap.
- There is a build up of ink around the head. The head catches the pooled ink and drags it across the paper. You can try performing some cleans to clear the build up, but a service may be required.
- The vacuum is incorrect. When you load the media, please check that the vacuum isn’t too low. The blue bar can be adjusted as the paper is loaded.
Please contact GMG support if the smudging persists. Make sure to have your printer serial number to hand.