HP LaserJet 4250 Service Manual - Page 398

Table 7-21 Light print (entire page) Possible cause Recommended action Begin by performing the half self-test functional check (see Half self-test functional check). 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. The toner supply is low. Shake the print cartridge gently to redistribute the toner, or replace the cartridge. EconoMode is on. EconoMode saves toner by reducing the dot density. The effect might appear to be a print-quality problem.) Turn EconoMode off. The print density is set incorrectly Change the toner density (see Printquality submenu) to a darker setting and try to print the job again. The media does not meet specifications. The moisture content, conductivity, or surface finish might not work correctly with the electrophotographic process. Try a different media type. The transfer roller is defective or not installed correctly. If the transfer roller loses conductivity, it cannot pull toner from the drum effectively. Verify that the transfer roller is installed correctly. If the transfer roller is damaged, replace it. See Transfer roller . The high-voltage connector springs are dirty or damaged. The high-voltage connector springs 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. 1 Remove and reseat the print cartridge. 2 Verify that the laser/scanner shutter door can open correctly. If necessary, replace the laser/ scanner assembly. See Laser/ scanner assembly. The power supply is defective. (The power supply contains the high-voltage circuit.) Replace the power-supply assembly. See Power supply. 384 7 Troubleshooting