HP Color LaserJet Enterprise CP4020 Service Manual - Page 446
Clean the fuser inlet guide., misformed characters.
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Problem Some color is misregistered. Sample Toner smears appear on the media. The printed page contains misformed characters. Text or graphics are skewed on the printed page. Cause Solution The product is incorrectly calibrated. The ITB unit is defective. Calibrate the product. If the ITB does not rotate smoothly or a cleaning malfunction occurs (ITB is dirty), replace the ITB. See Intermediate transfer belt (ITB) on page 92. The drive gear of the ITB motor is worn or chipped. Check each drive gear between the ITB drive roller and the ITB motor. If the gear is worn or chipped, replace the drive unit. The RD sensor is defective. Open and close the front door several times to clean the RD sensor. If the problem persists, replace the RD sensor. See Registration density (RD) sensor assembly on page 124. The laser/scanner unit is defective. Replace the laser/scanner assembly. See Laser/scanner assembly (Y/M) on page 186 or Laser/scanner assembly (C/Bk) on page 190. The print cartridge is defective. Replace the print cartridge of the affected color. The product has residual media. Remove the residual media. The fuser inlet guide is dirty. Clean the fuser inlet guide. The product is experiencing page skew. See the "Text or graphics are skewed on the printed page" row in this table. The laser/scanner unit is defective. Replace the laser/scanner assembly. See Laser/scanner assembly (Y/M) on page 186 or Laser/scanner assembly (C/Bk) on page 190. 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. See Secondary transfer assembly on page 119. 414 Chapter 3 Solve problems ENWW