HP CP6015dn Service Manual - Page 532

Problem Cause Solution A horizontal white line appears on the page. Horizontal scratches are present on the photosensitive drum. Replace the image drum of the color that matches the defect. See Change image drums on page 88. Scratches are present on the circumference of the ITB. Replace the ITB. See Intermediate-transfer belt (ITB) on page 196. Image in a particular color does not print in the correct color. Poor primary charging contacts or developing bias contacts between the high-voltage power-supply PCA A and the image drum. 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 image drum (primary charging roller, developing cylinder or photosensitive drum) is defective. Replace the image drum of the color that matches the defect. See Change image drums on page 88. The high-voltage power-supply PCA Replace the high-voltage power-supply PCA A is defective (no primary charging A. See High-voltage power supply PCA (A) bias or developing bias output). on page 226. The laser/scanner unit is defective. Replace the laser/scanner unit. See Laser/ scanner assembly (cyan and black) on page 297. Dropouts appear. The secondary transfer roller is deformed or has deteriorated. Replace the secondary-transfer-roller unit. See Transfer roller on page 194. The primary charging roller, developing cylinder, or photosensitive drum is deformed or has deteriorated. Replace the image drum of the color that matches the defect. See Change image drums on page 88. The fuser roller is deformed or has deteriorated. Replace the fuser. See Fuser on page 191. The high-voltage power-supply PCA Replace the high-voltage power-supply PCA B is defective (no transfer bias A. See See High-voltage power supply PCA output). (A) on page 226. The toner is not fully fused to the paper. The fuser roller or pressure roller is Replace the fuser. See Fuser on page 191. scarred or deformed. The fuser control PCA is defective. Replace the fuser control PCA. The thermistor or fuser heater has deteriorated. Replace the fuser. See Fuser on page 191. The thermopile is defective. Replace the thermopile-case unit. 490 Chapter 7 Solve problems ENWW