HP LaserJet Enterprise 500 Service Manual - Page 537

Table 3-49 Image defects table (continued) Problem Sample Some color is misregistered. Toner smears appear on the media. Cause The product is incorrectly calibrated. The ITB unit is defective. The drive gear of the ITB motor is worn or chipped. The RD sensor is defective. The laser/scanner unit is defective. The print cartridge is defective. The product has residual media. The fuser inlet guide is dirty. Solution Calibrate the product. If the ITB does not rotate smoothly or a cleaning malfunction occurs (ITB is dirty), replace the ITB. Check each drive gear between the ITB drive roller and the ITB motor. If the gear is worn or chipped, replace the drive unit. Open and close the front door several times to clean the RD sensor. If the problem persists, replace the RD sensor. Replace the laser/scanner assembly. Replace the print cartridge of the affected color. Remove the residual media. Clean the fuser inlet guide. The printed page contains misformed characters. Text or graphics are skewed on the printed page. The printed page contains wrinkles or creases. The product is experiencing page skew. The laser/scanner unit is defective. See the "Text or graphics are skewed on the printed page" row in this table. Replace the laser/scanner assembly. The registration shutter spring Check the spring and place it in the is unhooked. correct position. The registration shutter spring Replace the secondary transfer is deformed. assembly. The roller or media feed guide Clean any dirty components. is dirty. A feed roller is deformed or has deteriorated. Replace any deformed or deteriorated rollers. The paper feed guide is damaged. Replace the paper-feed-guide unit. ENWW Solve image quality problems 501