Lexmark T620 Service Manual - Page 147

4069-5XX/7XX Print Quality - Residual Image Service Tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade and other parts inside the print cartridge. FRU 1 Hot Roll Fuser Assembly Action Check the fuser assembly for signs of toner contamination. The hot roll especially might cause toner to be retained and deposited on the page. Print Quality - Light Print Service Tip: Check the toner saver and print darkness settings first if the print is light. FRU 1 Transfer Roll 2 Right Side Transfer Roll Arm Assembly Action Check the right end of the transfer roll shaft for signs of wear or contamination. If incorrect, replace the transfer roll. Check the right side transfer roll arm assembly bearing for any signs of wear or contamination. Also check to ensure the transfer cable is firmly attached to the bearing. If incorrect, replace the right side transfer arm assembly. Check the connection of the transfer roll assembly cable to the transformer on the HVPS board. Check the continuity of the cable from the bearing to the spade terminal on the cable. If incorrect, replace the right side transfer arm assembly. If correct, replace the HVPS. Diagnostic Information 2-119