Xerox 4400DT Service Manual - Page 164

Horizontal Streaks Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 7 1. Select the Printable Pages Menu, scroll to Print Test Go to step 8. Go to Prints, and press OK. High-Voltage 2. Switch OFF the printer power halfway through the print cycle. 3. Carefully remove the Print Cartridge and inspect the toner image on the drum just before the transfer area (Transfer Roller). Is the image on the Drum developed with sharp, Power Supply (HVPS) Assembly on page 3-31. black, easily read areas and no horizontal streaks? 8 Inspect the toner image on the Drum immediately after Go to step 9. Replace the the transfer area (Transfer Roller). Transfer Was the toner image on the Drum transferred to the paper along with any horizontal streaks. Roller Assembly (RRP 7.1 on page 6-79). 9 Warning: If the printer has been switched on, the Go to Replace the Fuser will be hot. Electrical Fuser 1. Open the Rear Cover and remove the Fuser Assembly. 2. Rotate the fuser idler gear manually and inspect the Noise on page 3-33 Assembly (RRP 6.2 on page 6-66). Heat Roller. 3. Open the fuser jam access cover. 4. Rotate the fuser idler gear manually and inspect the Pressure Roller. Are the Heat Roller and the Pressure Roller free of surface defects and contamination? Phaser 4400 Laser Printer Service Manual 3-67