HP 4700n Service Manual - Page 474

Table 7-31 Causes for smearing (continued) Cause The fuser inlet guide is dirty or contains debris. The cartridge shutters are not opening. Misplaced image Solution are damaged, replace the cartridge, or replace the printer ground contact. Clean the fuser inlet guide. Make sure the cartridge shutter bar is operating correctly. This table contains information about the causes of and solutions for misplaced images. Table 7-32 Causes for misplaced image Cause The media is skewed. The color-plane registration is out of specification. The duplex feed roller is worn. The oblique rollers are worn (this issue applies to duplex printing only). The DC controller PCB may require a firmware upgrade or the connectors to the high-voltage PCB (J1002 Yellow, J1003 Cyan, J1004 Magenta, and J1005 Black) are disconnected or not seated properly. Solution See Paper is skewed on page 433 to resolve the skew. Calibrate the printer from the PRINT QUALITY menu. See Full Calibrate Now on page 539. Replace the duplexer. See Duplexer on page 349. Replace the ETB. 1. Upgrade formatter and DC Controller firmware, which can be found in a single .rfu file from http://www.hp.com/ support/clj4700 or http://www.hp.com/support/cp4005. 2. Check the connectors (J1002 Yellow, J1003 Cyan, J1004 Magenta, and J1005 Black) on the DC controller PCB to make sure they are seated correctly. Repetitive defects troubleshooting Defects on printer rollers can cause image defects to appear at regular intervals on the page. Use Figure 7-4 Repetitive defects ruler on page 455 to measure the distance between defects that recur on a page. Use the repetitive defect spacing table to determine which roller is causing the defect. To resolve the problem, try cleaning the roller first. If the roller is still dirty after cleaning or if it is damaged, replace the indicated part. 454 Chapter 7 Troubleshooting ENWW