Kodak 800 SERIES service manual Vertical Banding Problems

NovaJet 800 Series Service Manual

18.Clean or replace encoder strip for image skewing (image walking or skipping). Whether the image skews slights or off the page the encoder strip is at fault. Typically characterized as horizontal banding, often a walking image can also create vertical bands to appear in the print. Refer to 'Scheduled Maintenance' for cleaning or 'Disassembly' for encoder strip replacement.

19.Improper grounding or earthing. An improper A/C outlet power ground may cause banding due to excessive noise on the line between the neutral and ground. Ensure the outlet has a clean zero ground potential with minimal noise between the neutral and ground.

20.Replace Main PWA for severe horizontal and vertical banding patterns. Refer to Disassembly.

Vertical Banding Problems

1.For vertical banding check carriage bushings for wear and ensure the bushings are free of dirt and ink residue buildup. Perform the carriage vibration test under 'Diagnostics' Menu, the lines should print fine with no jagged edges. Clean the bushings with a dry lint-free towel if necessary. Replace both carriage bushings. Refer to Disassembly.

2.Rotate image in software 90 degrees and/or print a test RTL file to verify banding. Obtain the Sample Images CD and refer to 'Demonstration Print' for proper procedures.

3.Replace the trailing cable prior to any circuit assembly replacement. Replace trailing cable for vertical jumps in color (i.e. one color does not print through one part of the print, the image appears to have a vertical pattern) or for vertical white spaces down a print. Replace the trailing cable if multiple sets of vertical bars appear along the right edge of the print, usually containing CMYK colors. The image may also be 'pushed' slightly to the left side of the printing area. Refer to Disassembly.

4.Clean or replace encoder strip for image skewing (image walking or skipping). Typically characterized as horizontal banding, often a walking image can also

Maintenance 3-22