Kodak 800 SERIES service manual Line Quality Problems Overspray

NovaJet 800 Series Service Manual

create vertical bands to appear in the print. Refer to 'Scheduled Maintenance' for cleaning or 'Disassembly' for encoder strip replacement.

Line Quality Problems (Overspray)

1.Check the print mode, normally quality is achieved in the draft, normal or best mode. The Super Draft mode is 600 x 300, not 600 x 600 like the other modes. Are any compression utilities being used? Avoid embedding text onto a layer that is compressed, this is known to cause apparent overspray like symptoms when printed.

2.Are the color deadband and color calibrations correct? Refer to Printer Calibrations.

3.Check the ink cartridge jet plate for buildup and ink residue. Refer to Scheduled Maintenance.

4.Clean the encoder strip (top and bottom), slide shaft and inside of carriage belt with isopropyl alcohol. Refer to Scheduled Maintenance.

5.Check carriage cover bushings (2 bushings) for wear and for cleanliness. Refer to Scheduled Maintenance. Check carriage bushings (4 inner bushings) for wear. Refer to Disassembly.

6.Ensure vacuum fan is providing adequate suction for media. Head strike is a leading cause of inconsistent horizontal banding and reported poor line quality. The carriage bushings may need replacement if worn out (thus a lower carriage head height).

7.Change media to see if electrostatic discharge from media is causing the banding to occur. Add 3rd party protection if required; a static eliminator strip with carbon fibers running the length of the strip may be necessary to dissipate discharge values in excess of 25KV. If 3rd party protection is added to the printer ensure the strip is grounded to the Main PWA ground properly.

8.Perform the carriage vibration test under 'Diagnostics' Menu, the lines should print fine lines with no jagged edges.

9.Print a test plot off the Demo Images CD. If no overspray or similar problems show, then check the software driver or original file. Draw a simple box and send to print from application; default line thickness should be 0.008" (AutoCAD). Check printed output for correct line thickness. Obtain the Demo

MAINTENANCE

Maintenance 3-23