Xerox 4400DT Service Manual - Page 162

Vertical Streaks Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes 6 Warning: If the printer has been switched on, Go to the Fuser will be hot. Electrical 1. Open the Rear Cover and remove the Fuser Assembly. Noise on page 3-33 2. Rotate the fuser idler gear manually and inspect the 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? No Replace the Fuser Assembly (RRP 6.2 on page 6-66). Horizontal Streaks There are black lines running horizontally across the page in the scan direction (at a right angle to the direction of paper travel). Initial Actions I Check that the paper supply is dry and fresh. I Inspect the printer paper path for items such as staples, paper clips and paper scraps. I Check installation of the Print Cartridge. I Check that the Print Cartridge ground contacts (on the right side of the Print Cartridge and in the Print Cartridge Side Guide in the printer) are clean. Phaser 4400 Laser Printer Service Manual 3-65