HP 750c Service Manual - Page 198

Corrective Actions Plot in an interlaced print mode (Best) thus increasing the number of passes over the media. Set the lightness to lighter" to reduce the amount of ink used. Increase the dry time to reduce the migration in multiĆpass print modes. 750C Halo 750C Plus 755 Description CM There is a white border between black and color area fills. Causes There is a reaction between the inks that changes the tensional forces at the edge, causing the black ink to move away from the color. This is also a common problem for all the CAD media types except the coated media. Corrective Actions Plot in an interlaced print mode (Best), thus increasing the number of passes over the media. Banding Description There are repetitive bands in the area fills. Causes The following are the main causes of this problem: D XĆaxis advance error: This error causes a variation of hue between consecutive bands. The hue is constant within each band. Nozzles are misaligned from one swath to the next. D Cartridge nozzles out, weak or misdirected: These problems generate horizontal lines of different color in area fills. In this case, instead of affecting the complete swath, the problem is restricted to the particular nozzles that are failing. In both cases, drop volume can help to hide the problems. A low drop volume makes the problems more visible. Corrective Actions D XĆaxis advance error: Perform the accuracy calibration ' page 7Ć6. If this does not fix the problem, troubleshoot the XĆaxis system (mark position test ' page 8Ć44). If necessary, replace the XĆaxis motor ' page 6Ć25. D Cartridge problems: Set the plotter to multiĆpass print mode. Replace the cartridges. Check the wipers and caps of the Service Station and if necessary, replace the service station ' page 6Ć42. D Drop volume too small: Troubleshoot the pen thermal management system, the TTOE, the carriage electronics and the cartridge. 9-20 Print Quality C4705-90000