Xerox 4400DT Service Manual - Page 160

Horizontal Deletions Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 8 Warning: Warning: If the printer has been Go to step 9. Replace the switched on, the Fuser will be hot. Fuser 1. Open the Rear Cover and remove the Fuser Assembly. 2. Rotate the fuser idler gear manually and inspect the 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? 9 Replace in order until the problem is solved: I HVPS PWB (RRP 9.6 on page 6-92) I Print Cartridge Side Guide (RRP 7.5 on page 6-83) I Transfer Roller Assembly (RRP 7.1 on page 6-79) I Transport Chute Assembly (RRP 6.1 on page 6-65) I Laser Assembly (RRP 7.4 on page 6-82) I Engine Logic Board (RRP 9.3 on page 6-89) I Fuser Assembly (RRP 6.2 on page 6-66) I MPT Chute Assembly (RRP 4.1 on page 6-44) I Registration Clutch (RRP 5.5 on page 6-62) I Turn Roller Assembly (RRP 11.8 on page 6-127) Vertical Streaks Extraneous dark lines/bands in the process direction (in 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. Phaser 4400 Laser Printer Service Manual 3-63