HP 1055CMHP - Manual (Page 170)

Print Quality
6-22
HP DesignJets 1050C and 1055CM Printers Service Manual
Solving Color Accuracy problems
These are two areas you should review when troubleshooting a
color accuracy problem:
Configuration (PostScript option only)
Check that you are using the correct driver setting and CRD
information for the software. Check which ink emulation mode has
been selected in the front panel.
Media
Make sure that the media loaded is genuine HP media and that the
correct media type has been selected on the front panel and in the
driver.
Color Consistency problems
n If color consistency is important for the customer, it is
recommended that they do not use HP-GL/2 to print with.
n Some media may discolor or change with age. Check that the
media is fresh and has been stored correctly.
n If the environmental conditions that the customer is printing in
change rapidly, you may see changes in the color consistency. By
reducing the time the print stays in extreme environmental
conditions after being printed (especially very high humidity)
you can reduce the color consistency problems.
n If you notice that there are color changes between different
printers i.e. between the 750C and this printer. It is normal. There
will be color differences between HP DesignJet printers because
the other printers use a different type of ink.
Long Term Color Bleeding (Glossy Papers)
If you see the colors are bleeding into the paper i.e. the color is
soaking into the paper making the lines fuzzy and bleary. This will
be because of the humidity conditions that the printer is working
under:
n Ask the customer to change the paper that they are printing with.
or
n Remove the printer from the high humidity conditions.