HP Scitex FB910 HP Scitex FB910 Printer Series - Recovering Jets on UV-Cure Pr - Page 2

Recovering Missing Jets - manual

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Preventing Jet Problems The piezo printhead technology used in ColorSpan Legacy UV-Cure printers is robust and long-lived when properly maintained. The nature of UV-curable ink, however, does mean that individual jets on a printhead that stop working may be difficult or impossible to recover. To avoid this situation, be sure to always follow these guidelines: 1. Clean the printheads daily. See Tech Note 2736, DisplayMaker UVR & UVX: Daily Cleaning Procedures, for the step-by-step cleaning process that should be performed each day. 2. Maintain a good environment for the printer: • Protect the printer from external light pollution. Leave all light-blocking apparatus in place on the printer. Avoid placing the printer in locations where it is exposed to natural or artificial light sources that could reach the printheads. • Avoid leaving the printer idle in environments with sustained high temperatures. 3. React to any possible headstrike by the carriage on media by cleaning the printheads immediately, even if you don't think the printheads touched the media. Despite the precautionary designs built in to the printer to protect the printheads, accidents can happen. It is not possible to know whether a headstrike touched the printheads or not. Cleaning the printheads any time there is a headstrike event is the best preventative process. Recovering Missing Jets Clean the Printheads A simple cleaning of the printheads with an appropriate cleaning cloth moistened with HP Printhead Flush Solution is always the first step in recovering jets. See the aforementioned Tech Note 2736, DisplayMaker UVR & UVX: Daily Cleaning Procedures, for the step-by-step cleaning process. Perform a Standard Air Purge The Purge option found on the printer's Front Page is the next step to attempt to recover missing jets. Consult the printer's User Manual for detailed information the Purge. In summary, the steps include: 1. Remove the left-side parking station from the printer. 2. Select Purge from the Front Page of the printer's control panel.The carriage will travel from Home to the left side of the printer. The Vacuum/Pressure system will then use air pressure applied to the printheads to force a small quantity of ink out of the printhead jetting orifices. 3. Use an appropriate cleaning cloth moistened with HP Printhead Flush Solution to blot away the expelled ink. 4. Return the carriage to Home and reinstall the parking station. 5. Print a Prime Bar to check for jetting improvement. Print the Jet Recovery Pattern The Jet Recovery Pattern uses an increased firing impulse applied to the printheads to "jump start" any jets that appear to be hesitant to fire. After the operator selects the desired printheads, the Jet Recovery Pattern prints a six-inch long solid block across the width of the media, then follows with a Prime Bar pattern printed with the normal printhead firing impulse. 2

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Preventing Jet Problems
The piezo printhead technology used in ColorSpan Legacy UV-Cure printers is robust and long-lived when properly
maintained. The nature of UV-curable ink, however, does mean that individual jets on a printhead that stop working
may be dif
fi
cult or impossible to recover. To avoid this situation, be sure to always follow these guidelines:
1.
Clean the printheads daily. See Tech Note 2736,
DisplayMaker UVR & UVX: Daily Cleaning Procedures
, for the
step-by-step cleaning process that should be performed each day.
2.
Maintain a good environment for the printer:
• Protect the printer from external light pollution. Leave all light-blocking apparatus in place on the printer.
Avoid placing the printer in locations where it is exposed to natural or arti
fi
cial light sources that could
reach the printheads.
• Avoid leaving the printer idle in environments with sustained high temperatures.
3.
React to any possible headstrike by the carriage on media by cleaning the printheads immediately, even if you
don’t think the printheads touched the media. Despite the precautionary designs built in to the printer to protect the
printheads, accidents can happen. It is not possible to know whether a headstrike touched the printheads or not.
Cleaning the printheads any time there is a headstrike event is the best preventative process.
Recovering Missing Jets
Clean the Printheads
A simple cleaning of the printheads with an appropriate cleaning cloth moistened with HP Printhead Flush Solution
is always the
fi
rst step in recovering jets. See the aforementioned Tech Note 2736,
DisplayMaker UVR & UVX: Daily
Cleaning Procedures
, for the step-by-step cleaning process.
Perform a Standard Air Purge
The Purge option found on the printer’s Front Page is the next step to attempt to recover missing jets. Consult the printer’s
User Manual
for detailed information the Purge. In summary, the steps include:
1.
Remove the left-side parking station from the printer.
2.
Select Purge from the Front Page of the printer’s control panel.The carriage will travel from Home to the left side of
the printer. The Vacuum/Pressure system will then use air pressure applied to the printheads to force a small quantity
of ink out of the printhead jetting ori
fi
ces.
3. Use an appropriate cleaning cloth moistened with HP Printhead Flush Solution to blot away the expelled ink.
4. Return the carriage to Home and reinstall the parking station.
5. Print a Prime Bar to check for jetting improvement.
Print the Jet Recovery Pattern
The Jet Recovery Pattern uses an increased
fi
ring impulse applied to the printheads to “jump start” any jets that appear
to be hesitant to
fi
re. After the operator selects the desired printheads, the Jet Recovery Pattern prints a six-inch long
solid block across the width of the media, then follows with a Prime Bar pattern printed with the normal printhead
fi
ring
impulse.