HP 8550 Service Manual - Page 468
Horizontal stripe test print TYPE=10
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Horizontal stripe test print (TYPE=10, 16) Use the horizontal test print to check the dark-area density of each color, balance between colors, and white lines created during development. l Dark-area density of each color and balance between colors-The density must not be appreciably low (light image). If the density of one color is low, the light-color toner cartridge is likely to be faulty. If the density of all colors is low, primary or secondary transfer is likely to be faulty. l White lines created by development-If white lines are found in the cyan area of the copy, the cyan toner cartridge is likely to be faulty. l Uneven density between left and right-If the right and left densities are uneven for all colors, the drum cartridge, secondary pre-transfer charging assembly, or secondary transfer belt assembly of the printer unit is likely to be faulty. l Left/right image position-If the image-read start position (ADJX/Y) is faulty, the left and right position will be displaced, eliminating the non-image width. Such a condition can cause toner to fly astray and soil the inside of printer. Figure 403. Horizontal stripe test print 466 Chapter 7 - Troubleshooting EN