Memjet Quadient Rena MACH 6, User Manual

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SECTION 5
TROUBLESHOOTING
94
Color Mixing Issues:
Color mixing will show as muddy, mottled or distorted (grainy) colors.
Color mixing occurs when the ink from one color channel crosses over into another color channel. Since the inkjet
nozzle rows are located very close to one another (ten rows of 7,040 nozzles, located within a 0.8 mm space), it is
easy for partials or fibers to create bridges across color channels. These bridges allow ink to flow (wick) from one
color channel to another; resulting in a “localized” color mixing event; as shown in the examples below.
Color mixing can occur for a number of reasons (here are some common ones)
Possible Causes:
•
Printhead Cartridge just installed. It is common to see some color mixing immediately after the system is
primed with ink.
•
Ink wicking due to fibers (dust) bridging inkjet nozzles.
•
Wiper roller too dry. Ink coagulated on roller. Installed new Wiper Roller but it was not “conditioned”.
•
Wiper roller saturation (too much ink on wiper roller). This can occur if the cleaning features
(Quick/Normal/Full Clean Printhead) or “Condition Wiper” are run too frequently.
•
Ink flooding on the nozzle plate; due to printer not being level.
•
Ink flooding on the nozzle plate; due to excessive back-pressure in the ink system.
•
Wiper Roller is not being cleaned properly by the system. This can occur if there is a problem with the
Wiper Motor Module (Wiper Roller not turning, Damaged Squeegee Blade).
•
Incompatible Media.
Possible Solutions:
•
Wipe printhead using a lint-free cloth, dampened with distilled water.
•
Print a few Color Bars or Ink Channels Test Pages to clear color contamination within nozzles.
•
Run “Condition Wiper”, in Wiper Menu, to hydrate Wiper Roller.
•
Run “Wiper Transfer” in Wiper Menu, to reduce ink (moisture) on Wiper Roller.
•
Make sure printer is on a sturdy, level table.
•
Instead of powering the printer off, when not in use, leave the print engine powered-up; so it can perform
automatic maintenance routines. This also allows the pressures in the system to be routinely equalized.
•
Test the printer, using a compatible “inkjet suitable” media, to determine if this could be the cause.
•
Contact Service Support representative to have them inspect/clean/adjust the service station.
If necessary; they may need to replace the wiper roller and or wiper motor assembly.
NOTE : The “Print Color Bars” test print pattern, shown
here, can be performed using the “Print Color Bars”
button, located in the “Test Print Menu” on the Printer’s
Touchscreen.