HP 4600 Service Manual - Page 372
Horizontal lines, Missing color
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Table 7-29 Causes for white vertical lines (continued) Cause Solution The laser is blocked by a foreign substance. Inspect the laser source for the affected color, and remove any debris that might be blocking it. The mirror in the laser/scanner unit is dirty. Replace the laser/scanner for the color in which the white lines appear. Calibrate the printer after replacing the laser/ scanner. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). The fuser sleeve is scarred vertically. (All colors are affected.) Replace the fuser. Horizontal lines This table contains information about the causes of and solutions for horizontal lines. Table 7-30 Causes for horizontal lines Cause Solution The photosensitive drum has scars that run from end to end. Replace the print cartridge for the affected color. The fuser sleeve has scars that run from end to end. Replace the fuser. White horizontal lines This table contains information about the causes of and solutions for white horizontal lines. Table 7-31 Causes for white horizontal lines Cause Solution The photosensitive drum has scars that run from end to end. Replace the print cartridge for the affected color. The ETB belt has horizontal scars. Replace the ETB. Calibrate the printer after replacing the ETB. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). Missing color This table contains information about the causes of and solutions for missing color. Table 7-32 Causes for a missing color Cause A poor contact exists in the developing bias contacts of the high-voltage PCA and the print cartridge. The primary charging roller is defective. The laser/scanner unit is defective. Solution Clean the contacts. If they are still dirty after cleaning, or if they are damaged, replace the print cartridge or the highvoltage contacts. Replace the high-voltage PCA. Replace the print cartridge for the missing color. Replace the laser/scanner for the missing color. Calibrate the printer after replacing the laser/scanner. See Calibrate 356 Chapter 7 Troubleshooting ENWW