Roland TrueVIS VG-640 User Manual page 100

When Dot Drop-outs/Uneven Colors Are Not Fixed
Cleaning of the Surface of the Print Heads as an Emergency Measure
When dot drop-out or dot deflection is not improved even if cleaning is performed several times, you can
clean the surface of the print heads as an emergency measure. The print head surface (nozzle surface) is a
very delicate mechanism, so work must be performed carefully and cautiously.
Note that this operation is an emergency measure. Depending on symptoms, it may damage normal areas
and cause symptoms to worsen. If you have any questions, contact your authorized Roland DG Corp. dealer.
Procedure
A
Soak up a generous amount of cleaning liquid using a cleaning stick.
B
Very gently touch the cleaning stick against the print head surface (nozzle surface).
Very softly press the cleaning stick against the print head so that cleaning liquid soaks into the print
head surface (nozzle surface). Never rub the stick or press it forcefully against the print head surface.
3
98