HP 2700n Service Manual - Page 231

Color missing Table 6-17 Causes for a missing color Cause Defective laser shutter Poor developing-bias contacts Defective cartridge (primary-charging roller) Laser/scanner unit is defective High-voltage PCB is defective DC controller PCB is defective Blank spots Table 6-18 Causes for blank spots Cause Poor secondary-transfer-bias contacts High-voltage PCB is defective DC controller PCB is defective Poor fusing Table 6-19 Causes for poor fusing Cause Media is not within specifications Fuser is not within nip-width specifications Fuser sleeve is scarred or damaged Pressure roller is scarred or damaged Printer is not properly set for media type ENWW Solution Check the problem color laser shutter. Clean the shutter as necessary. Replace the shutter if it is deformed or damaged. For the cartridge with the problem (color missing), check the developing-bias contacts to the high-voltage PCB. Clean contacts, if dirty. Replace defective parts if the contacts are deformed or damaged. Replace the problem (color missing) color cartridge. Replace the laser/scanner for any missing color. Calibrate the printer after replacing the laser/scanner. Replace the high-voltage PCB. Replace the DC controller PCB. Calibrate the printer after replacing the DC controller. Solution On the secondary-transfer roller, check the bias contacts to the high-voltage PCB. Clean the contacts as necessary. Replace any deformed or damaged contacts. Replace the high-voltage PCB. Replace the DC controller PCB. Calibrate the printer after replacing the DC controller. Solution Use media that meets specifications. See Table 6-26 Causes of repetitive defects on page 216 to determine whether a fuser sleeve is involved. If so, replace the fuser sleeve unit. Replace the fuser. See Table 6-26 Causes of repetitive defects on page 216 to determine if a pressure roller is involved. If so, replace the fuser. Set the printer for the media type being used. Image defects 213