Xerox 4400DT Service Manual - Page 152

Light Prints Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 4 Check for the continuity between the Metal Grounding Contact and the printer body frame. Is there continuity between the Metal Grounding Contact and the printer frame? Go to step 5. Replace the Print Cartridge Side Guide (RRP 7.5 on page 6-83). 5 Inspect Laser beam path between the Laser Go to step 6. Clean the Assembly and the Drum for obstructions. Laser window Is the laser beam path free of obstructions? and remove any obstructions from the laser beam path. 6 Is the Transfer Roller intact and free of contamination? Go to step 7. Replace the Transfer Roller (RRP 7.1 on page 6-79). 7 Generate a Test Print and switch OFF the printer Go to step 8. Go to power halfway through the print cycle. Carefully High-Voltage remove the Print Cartridge and inspect the toner Power Supply image on the drum just before the transfer area (HVPS) (Transfer Roller). Assembly on Is the image on the drum completely page 3-31 developed with sharp, black, easy-to-read areas? 8 Inspect the toner image on the drum immediately Go to step 9. Go to after the transfer area (Transfer Roller). (High-Voltage Is the toner image on the drum transferred completely to the paper? Power Supply (HVPS) Assembly on page 3-31) 9 Replace in order until the problem is solved: I HVPS PWB (RRP 9.6 on page 6-92), I Laser Assembly (RRP 7.4 on page 6-82), I Engine Logic Board (RRP 9.3 on page 6-89), I Transport Chute Assembly (RRP 6.1 on page 6-65). Phaser 4400 Laser Printer Service Manual 3-55