HP 1055CMHP - Manual (Page 168)

Print Quality
6-20
HP DesignJets 1050C and 1055CM Printers Service Manual
11 When you look at the image you have printed there is banding on
the image, but only in a few colors, similar to the example shown
below.
a The possible combinations with this problem are:
n Banding in cyan, blue and green columns only, but more evident
in cyan. This means that the cyan printhead could be permanently
damaged
.
n Banding in magenta, red and blue columns only, but more
evident in magenta. This means that the magenta printhead could
be permanently damaged.
n Banding in yellow, red and green columns only, but more
evident in yellow. This means that the yellow printhead could be
permanently damaged.
n Banding in black column only. This means that the black
printhead could be permanently damaged.
b If you want optimal print quality from your printer, replace the damaged
printhead with a new one.
NOTE However, the printer can still produce good quality line prints.
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