HP 1055CMHP - Manual (Page 158)

Print Quality
6-10
HP DesignJets 1050C and 1055CM Printers Service Manual
Solving the Banding Problem
There main causes of banding:
n Printhead problems (see below).
n Use of Non-HP media
n Incorrect media type selected in the front panel.
n Media advance problems.
Banding Caused by Printhead Problems
In this case you will see banding in only a few colors.
If the test pattern has clear or dark horizontal bands in one or more
of the primary color columns, then several of the secondary color
columns will also have the same type of bands in the same position
(but perhaps with less intensity).
In the following example, several nozzles in the magenta printhead
are not printing. There will be clear repetitive bands (perhaps white)
in the magenta column. Consequently, you will see lower intensity
bands in the same print position in the red (which is Magenta +
Yellow) and blue (which is Magenta + Cyan) of the secondary color
columns.
1 The bands could be caused by the nozzles not printing correctly.
You can check the health of the nozzles by performing the Nozzle
Print Test.
3
C60742