Xerox 4400DT Service Manual - Page 155

Black Prints A totally black output print. There is toner on the paper with no visible image. Initial Actions 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. I Ensure the machine covers are in place and fit well so no outside light can enter the machine. Black Prints Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Install a new Print Cartridge. 2. Print a Test Print. Is the print normal? Problem solved. Go to step 2. 2 Shield half of the window of the Laser Assembly. Print a Go to Laser Go to Test Print. Assembly on Electrical Is the print half white and half black? page 3-17. Noise on page 3-33. 3-58 Phaser 4400 Laser Printer Service Manual