HP 4600 Service Manual - Page 369
Dark image, Dark color, Completely blank image, All black or solid color
UPC - 808736060875
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Dark image This table contains information about the causes of and solutions for dark images. Table 7-21 Causes for dark images Cause The image density is not adjusted correctly. The color-registration detection unit is dirty. The color-registration detection unit is defective. The DC controller PCA is defective. Solution Decrease the density for each color. Clean the lens on the color-registration detection unit. Replace the color-registration detection unit. Replace the DC controller PCA. Calibrate the printer after replacing the DC controller. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). Dark color This table contains information about the causes of and solutions for dark color. Table 7-22 Causes for dark colors Cause A poor contact exists in the drum ground, primary charging bias, and developing bias contacts of the high-voltage PCA and the print cartridge. The high-voltage PCA is defective. The DC controller PCA is defective. Solution Clean the contacts on the cartridge for the affected color. If they are still dirty after cleaning, or if they are damaged, replace the cartridge. Replace the high-voltage PCA. Replace the DC controller PCA. Calibrate the printer after replacing the DC controller. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). Completely blank image This table contains information about the causes of and solutions for completely blank pages. Table 7-23 Causes for a completely blank image Cause The high-voltage PCA is defective. The DC controller PCA is defective. Solution Replace the high-voltage PCA. Replace the DC controller PCA. Calibrate the printer after replacing the DC controller. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). All black or solid color This table contains information about the causes of and solutions for all black or solid color. ENWW Image defects troubleshooting 353