Table 7-28. Dropout Possible Cause Recommended Action 1. Single sheet of paper is defective. Try reprinting the job. 2. Paper does not meet specifications. The moisture content, conductivity, or surface finish may not work correctly with the electrophotographic process. Try a different paper lot (see HP LaserJet Printer Family Paper Specifications Guide). 3. DC Controller is defective (low primary voltage). Replace the DC Controller. See “PCA, DC Controller” on page 207 for instructions. 4. High Voltage Power Supply PCA is defective. Replace the High Voltage Power Supply PCA. See “High Voltage Power Supply (HVPS)” on page 215 for instructions. 5. Transfer Roller is defective.
Replace the Transfer Roller. See “Transfer Roller Assembly” on page 228 for instructions. Table 7-29. Black Lines (parallel or perpendicular to path) Possible Cause Recommended Action 1. Toner cartridge is not seated properly. Remove the cartridge and reinsert it. 2. Toner cartridge is damaged. Inspect the toner cartridge for a scratched or streaked photosensitive drum. Clean the printer (see “Cleaning the Printer and Accessories” on page 82), and replace the cartridge. 474 Chapter 7 Troubleshooting C4085-91087