HP 750 - Manual (Page 198)

750C
750C
Plus
755
CM
9-20 Print Quality C4705-90000
Corrective Actions
Plot in an interlaced print mode (Best) thus increasing the number ofpasses over the media.
Set the lightness to lighter" to reduce the amount ofink used. Increase the dry time to reduce
the migration in multiĆpass print modes.
Halo
Description
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 ofpasses 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 ofhue 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. Ifthis does not fix the
problem, troubleshoot the XĆaxis system (mark position test ' page 8Ć44). Ifnecessary,
replace the XĆaxis motor ' page 6Ć25.
D Cartridge problems: Set the plotter to multiĆpass print mode. Replace the cartridges.
Check the wipers and caps ofthe Service Station and ifnecessary, 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.