HP Color LaserJet Professional CP5220 Service Manual - Page 252

Solve image-quality problems Occasionally, you might encounter problems with print quality. The information in the following sections helps you identify and resolve these issues. Image defects table The following examples depict letter-size paper that has passed through the product short-edge first. These examples illustrate problems that would affect all the pages that you print, whether you print in color or in black only. The topics that follow list the typical cause and solution for each of these examples. Problem Print is light or faded on entire page. Sample Print is light or faded in a particular color. Image is too dark. Cause Solution Poor contacts exist on the ITB unit and the product grounding unit. Clean the grounding contacts. If the problem remains after cleaning, check the contacts for damage. Replace any deformed or damaged parts. Poor secondary transfer contacts exist on the secondary transfer roller and the ITB. Clean the contacts. If the problem remains after cleaning, check the contacts for damage. Replace any deformed or damaged parts. Poor primary transfer bias contacts on the ITB unit and product. Poor primary charging bias contacts with the print cartridge and product. Clean the contacts of the color that produces the light print. If the problem remains after cleaning, check the contacts for damage. Replace any deformed or damaged parts. Poor developing bias contacts with the print cartridge and product. The RD sensor is defective. Replace the RD sensor. See Registration sensor assembly on page 112. Page is blank. One color is missing. The high-voltage powersupply lower is defective (no developing bias output). Replace the high-voltage powersupply lower. See Imaging (developing) high-voltage power supply on page 152. The print cartridge for the missing color has not released the charge-roller alienation mechanism. Remove and reinstall the print cartridge to release the alienation mechanism. 240 Chapter 3 Solve problems ENWW