HP LaserJet Enterprise 500 Service Manual - Page 536

Table 3-49 Image defects table (continued) Problem Sample Image in a particular color does not print in the correct color. Dropouts appear. The toner is not fully fused to the paper. Cause Solution Poor contact exists in the primary charging bias or developing bias contacts between the print cartridge and the product. Clean each contact of the color that produces the missing color. If the problem remains after cleaning, check the contacts for damage. Replace any deformed or damaged parts. The print cartridge (primary charging roller, developing roller, or photosensitive drum) is defective. Replace the print cartridge of the color that matches the defect. The high-voltage power-supply lower is defective (no primary charging bias or developing bias output). Replace the high-voltage powersupply lower. The laser/scanner unit is defective. Replace the laser/scanner assembly. The secondary transfer roller is deformed or has deteriorated. Replace the secondary-transferroller. The primary charging roller, developing roller, or photosensitive drum is deformed or has deteriorated. Replace the print cartridge of the color that matches the defect. The fuser roller is deformed or Replace the fuser. has deteriorated. The high-voltage power-supply T PCA is defective (no transfer bias output). Replace the high-voltage powersupply upper. The fuser roller or pressure Replace the fuser. roller is scarred or deformed. The thermistor is defective. Replace the fuser. The fuser heater is defective. 500 Chapter 3 Solve problems ENWW