HP 1050c Service Manual - Page 159

NOTE Print Quality 2 The light or dark horizontal lines could also be caused by permanently damaged printheads. 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. If you want the best high quality image from your printer, replace the damaged printhead with a new one. However, your printer can still produce good quality line prints. Banding Caused by Media Advance Problems Another type of banding is caused by an inaccurate media advance in this case there will be banding (horizontal repetitive bands along the test pattern) in all the primary and secondary color columns. The bands can appear as dark bands, due to a shorter advance of the roller which causes an overlap, or lighter bands due to a longer advance causing spaces. 3 HP DesignJets 1050C and 1055CM Printers Service Manual C6074281 6-11