HP 4300 Service Manual - Page 333

Table 55. Light print (partial page) Possible cause Recommended action(s) The print cartridge is not installed correctly. q Remove and then reinstall the print cartridge. The top cover should completely close when the cartridge is fully seated. Toner supply is low or toner cartridge developer is defective. 1. Shake the print cartridge gently to redistribute the toner. 2. Replace the cartridge. Transfer roller is worn or contaminated or maintenance might be due. q Print a supplies status page (see"Supplies status page" on page 242) and look at the maintenance kit gauge. If maintenance is due, install a maintenance kit. For information about ordering a maintenance kit, see chapter 8. Table 56. Light print (entire page) Possible cause Recommended action Begin by performing the half self-test functional check (see "Half self-test functional check" on page 310). If the image on the print drum is light, proceed with actions 1, 2, 3, 6, and 7. If the drum image is normal, proceed with actions 5, 6, and 8. Toner supply is low. Action 1 q Shake the print cartridge gently to redistribute the toner, or replace the cartridge. EconoMode is on. Action 2 EconoMode saves toner by reducing the q Turn EconoMode off. dot density. The effect might appear to be a print-quality problem in some cases. Print density is set incorrectly Action 3 q Change the toner density (see"Print Quality submenu" on page 46) to a darker setting and try the print job again. The media does not meet specifications. Action 4 The moisture content, conductivity, or q Try a different paper lot. surface finish might not work correctly with the electrophotographic process. The transfer roller is defective or not installed correctly. If the transfer roller loses conductivity, it cannot effectively pull toner from the drum. Action 5 q Verify the transfer roller is installed correctly. If the transfer roller is damaged, replace it. See "Transfer roller" on page 138. The high-voltage connector springs are dirty or damaged. Action 6 q The high-voltage connectors protrude into the print cartridge cavity. Clean the springs if they are dirty. Replace the springs if they are damaged or missing. The laser/scanner shutter door is not opening correctly. Action 7 1. Remove and reseat the print cartridge. 2. Verify that the laser/scanner shutter door can open properly. If necessary, replace the laser/scanner assembly. See "Laser/scanner assembly" on page 173. The power supply is defective. The Action 8 power supply contains the high-voltage q Replace the power supply. See "Power supply" on page 188 circuit. Q2431-90912 Chapter 7 Troubleshooting 313